MicroLogix™ 1500 Programmable Controllers Bulletin 1764 User Manual
Important User Information Because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.
Summary of Changes The information below summarizes the changes to this manual since the last printing. To help you find new and updated information in this release of the manual, we have included change bars as shown to the right of this paragraph. The table below lists the sections that document new features and additional or updated information on existing features.
Summary of Changes iv Publication 1764-UM001B-EN-P - March 2002
Table of Contents Preface Who Should Use this Manual. . . . . . . . . . . . . . . . Purpose of this Manual . . . . . . . . . . . . . . . . . . . . Related Documentation . . . . . . . . . . . . . . . . . . . . Common Techniques Used in this Manual . . . . . . Rockwell Automation Support . . . . . . . . . . . . . . . Local Product Support . . . . . . . . . . . . . . . . . . Technical Product Assistance . . . . . . . . . . . . . Your Questions or Comments on this Manual . . . . . . . . . . . . . . . . . . .
Table of Contents vi Input States on Power Down . . . . . . . Other Types of Line Conditions . . . . . Preventing Excessive Heat . . . . . . . . . . . . Master Control Relay . . . . . . . . . . . . . . . . Using Emergency-Stop Switches . . . . . Schematic (Using IEC Symbols) . . . . . Schematic (Using ANSI/CSA Symbols). Base Unit Mounting Dimensions . . . . . . . Controller Spacing. . . . . . . . . . . . . . . . . . Mounting the Controller . . . . . . . . . . . . . Using a DIN Rail . . . . . . . . . . . .
Table of Contents Using a Modem . . . . . . . . . . . . . . . . . . . . . Isolated Modem Connection. . . . . . . . . . . . Connecting to a DF1 Half-Duplex Network . Connecting to a DH-485 Network . . . . . . . . . . DH-485 Configuration Parameters. . . . . . . . Recommended Tools . . . . . . . . . . . . . . . . . DH-485 Communication Cable . . . . . . . . . . Communication Cable Connection to the DH-485 Connector . . . . . . . . . . . . . . . . . . . Connecting the AIC+ . . . . . . . . . . . . . . . . .
Table of Contents viii Data File Download Protection. . . Memory Module Write Protection . Removal/Insertion Under Power. . Memory Module Information File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 6-5 6-5 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents ix Appendix D Upgrading Your Operating System Preparing for Upgrade. . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1 Performing the Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . D-2 Missing/Corrupt OS LED Pattern . . . . . . . . . . . . . . . . . . . . D-2 Appendix E Understanding Communication Protocols RS-232 Communication Interface . . . . . . . . . . . . . . . . . . DF1 Full-Duplex Protocol . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents x Publication 1764-UM001B-EN-P - April 2002
Preface Read this preface to familiarize yourself with the rest of the manual. It provides information concerning: • • • • • Who Should Use this Manual who should use this manual the purpose of this manual related documentation conventions used in this manual Rockwell Automation support Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use MicroLogix 1500 controllers.
Preface P-2 For Read this Document Document Number A technical overview of the MicroLogix 1500 and related products MicroLogix 1500 Programmable Controllers Technical Data 1764-TD001 Information on the MicroLogix 1500 Controllers instruction set MicroLogix 1200 and 1500 Programmable 1762-RM001 Controllers Instruction Set Reference Manual Information on mounting and wiring the MicroLogix 1500 Base Units, including a mounting template for easy installation MicroLogix 1500 Programmable Controllers B
Preface P-3 Common Techniques Used in this Manual The following conventions are used throughout this manual: Rockwell Automation Support Rockwell Automation offers support services worldwide, with over 75 Sales/Support Offices, 512 authorized Distributors and 260 authorized Systems Integrators located throughout the United States alone, plus Rockwell Automation representatives in every major country in the world. • Bulleted lists such as this one provide information, not procedural steps.
Preface P-4 If the problem persists, call your local Rockwell Automation representative or contact Rockwell Automation in one of the following ways: Phone Internet United States/Canada 1.440.646.5800 Outside United States/Canada You can access the phone number for your country via the Internet: 1. Go to http://www.ab.com 2. Click on Product Support (http://support.automation.rockwell.com) 3. Under Support Centers, click on Contact Information ⇒ 1. Go to http://www.ab.com 2.
Chapter 1 Hardware Overview Hardware Features The MicroLogix 1500 programmable controller is composed of a base unit, which contains a power supply, input and output circuits, and a processor. The controller is available with 24 or 28 points of embedded I/O. Additional I/O may be added using Compact™ I/O.
1-2 Hardware Overview MicroLogix 1500 Component Descriptions A controller is composed of a processor (1764-LSP or enhanced 1764-LRP with RS-232 port) and one of the base units listed below. The FET transistor outputs are available on the 1764-28BXB base only.
Hardware Overview 1-3 Processors Processor (Catalog Number 1764-LSP) Processor (Catalog Number 1764-LRP) Communications Port • DTE (male) 9-pin D-shell connector • 30V dc isolation Data Access Tool (Catalog Number 1764-DAT) 1764-DAT mounted on 1764-LSP processor.
1-4 Hardware Overview Memory Modules/Real-Time Clock Memory module mounted on 1764-LSP processor. The following memory modules and real-time clock modules are available: Catalog Number Function Memory Size 1764-RTC Real-Time Clock not applicable 1764-MM1 Memory Module 8K 1764-MM1RTC Memory Module and Real-Time Clock 8K 1764-MM2(1) Memory Module 16K 1764-MM2RTC(1) Memory Module and Real-Time Clock 16K (1) For 1764-LRP programs greater than 8k, use the 1764-MM2 or 1764-MM2RTC.
Hardware Overview Programming 1-5 Programming the MicroLogix 1500 programmable controller is done using RSLogix™ 500, Rev. 4.0 or later. Certain features are only available when using the most current version of the software, as noted in System Requirements for Using Expansion Modules on page 1-7. The following table lists the firmware release numbers, feature and functionality enhancements, and the required version of RSLogix 500 and RSLogix 500 Starter software. Table 1.
1-6 Hardware Overview Communication Options The MicroLogix 1500 can be connected to a personal computer. It can also be connected to the DH-485 network using an Advanced Interface Converter (1761-NET-AIC), to an Ethernet network using an Ethernet Interface (1761-NET-ENI), or to a DeviceNet™ network using a DeviceNet Interface (1761-NET-DNI) or through the DeviceNet Scanner module (1769-SDN). The controller can also be connected to Modbus™ SCADA networks as an RTU slave.
Hardware Overview 1-7 Expansion Power Supply and Cables With Operating System Revision Number (FRN) 3 or higher, you can connect an additional bank of I/O to your controller. Using an expansion power supply increases the system’s capacity for adding expansion I/O modules. The additional I/O bank is connected to the controller via a specially designed cable. The additional I/O bank must include a power supply and an end cap.
1-8 Hardware Overview To support a maximum of 16 I/O modules in an additional I/O bank, you must have the following: Table 1.
Hardware Overview 1-9 Adding an I/O Bank System Guidelines A maximum of one 1769 Expansion Cable can be used in a MicroLogix 1500 system, allowing for two banks of I/O modules (one connected directly to the controller, and the other connected via the cable). Each I/O bank requires its own power supply (Bank 1 uses the controller’s embedded power supply). ATTENTION ! ATTENTION ! LIMIT OF ONE EXPANSION POWER SUPPLY The expansion power supply cannot be connected directly to the controller.
1-10 Hardware Overview The following illustrations show a MicroLogix 1500 with an expansion I/O bank. Vertical Orientation Expansion I/O Bank 1 1769-CRRx(1) Expansion Cable Expansion I/O Bank 2 1769-ECL End Cap (1) The x in this catalog number can be either a 1 or a 3 representing the length of the cable: 1 = 1 foot (305 mm) and 3 = 3.28 feet (1 meter).
Hardware Overview 1-11 Addressing Expansion I/O The expansion I/O is addressed as slots 1 through 16 (the controller’s embedded I/O is addressed as slot 0). Power supplies and cables are not counted as slots. Modules are counted from left to right on each bank as shown in the illustrations below. For more information on addressing, refer to the MicroLogix 1200 and MicroLogix 1500 Programmable Controllers Instruction Set Reference Manual, publication 1762-RM001.
1-12 Hardware Overview Publication 1764-UM001B-EN-P - April 2002
Chapter 2 Installing Your Controller This chapter shows you how to install your controller system. The only tools you require are a Flat or Phillips head screwdriver and drill. Topics include: • • • • • • • • Agency Certifications Compliance to European Union Directives agency certifications compliance to European Union Directives using in hazardous locations master control relay power considerations preventing excessive heat controller spacing mounting the controller • UL 508 • C-UL under CSA C22.
2-2 Installing Your Controller Low Voltage Directive This product is tested to meet Council Directive 73/23/EEC Low Voltage, by applying the safety requirements of EN 61131-2 Programmable Controllers, Part 2 - Equipment Requirements and Tests. For specific information required by EN 61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications: • Industrial Automation Wiring and Grounding Guidelines for Noise Immunity, publication 1770-4.
Installing Your Controller Safety Considerations 2-3 Safety considerations are an important element of proper system installation. Actively thinking about the safety of yourself and others, as well as the condition of your equipment, is of primary importance. We recommend reviewing the following safety considerations. Hazardous Location Considerations This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or non-hazardous locations only.
2-4 Installing Your Controller Use only the following communication cables in Class I, Division 2 hazardous locations. Table 2.
Installing Your Controller 2-5 Power Distribution There are some points about power distribution that you should know: • The master control relay must be able to inhibit all machine motion by removing power to the machine I/O devices when the relay is de-energized. It is recommended that the controller remain powered even when the master control relay is de-energized. • If you are using a dc power supply, interrupt the load side rather than the ac line power.
2-6 Installing Your Controller Power Supply Inrush During power-up, the MicroLogix 1500 power supply allows a brief inrush current to charge internal capacitors. Many power lines and control transformers can supply inrush current for a brief time. If the power source cannot supply this inrush current, the source voltage may sag momentarily. The only effect of limited inrush current and voltage sag on the MicroLogix 1500 is that the power supply capacitors charge more slowly.
Installing Your Controller 2-7 power supply shuts down the system. Understanding this concept is important. Write the user program, taking this effect into account. Other Types of Line Conditions Occasionally the power source to the system can be temporarily interrupted. It is also possible that the voltage level may drop substantially below the normal line voltage range for a period of time. Both of these conditions are considered to be a loss of power for the system.
2-8 Installing Your Controller Master Control Relay A hard-wired master control relay (MCR) provides a reliable means for emergency machine shutdown. Since the master control relay allows the placement of several emergency-stop switches in different locations, its installation is important from a safety standpoint. Overtravel limit switches or mushroom-head push buttons are wired in series so that when any of them opens, the master control relay is de-energized.
Installing Your Controller 2-9 equipment within the enclosure, use the disconnect to shut off power to the rest of the system. TIP Do not control the master control relay with the controller. Provide the operator with the safety of a direct connection between an emergency-stop switch and the master control relay. Using Emergency-Stop Switches When using emergency-stop switches, adhere to the following points: • Do not program emergency-stop switches in the controller program.
2-10 Installing Your Controller Schematic (Using IEC Symbols) L1 L2 230V ac Disconnect Fuse Isolation Transformer X1 115V ac X2 or 230V ac MCR 230V ac I/O Circuits Operation of either ofthese contacts will remove power from the external I/O circuits, stopping machine motion. Emergency-Stop Push Button Fuse Overtravel Limit Switch Stop Master Control Relay (MCR) Cat. No. 700-PK400A1 Start MCR Suppr. MCR 115V ac or 230V ac I/O Circuits MCR dc Power Supply.
Installing Your Controller 2-11 Schematic (Using ANSI/CSA Symbols) L1 L2 230V ac Disconnect MCR Fuse 230V ac Output Circuits Isolation Transformer X1 115V ac or 230V ac Operation of either ofthese contacts will remove power from the external I/O X2 Emergency-Stop Push Button Fuse Overtravel Limit Switch Stop Master Control Relay (MCR) Cat. No. 700-PK400A1 Start MCR Suppressor Cat. No. 700-N24 MCR Suppr. MCR 115V ac or 230V ac I/O Circuits dc Power Supply.
2-12 Installing Your Controller Base Unit Mounting Dimensions A B C Dimension(1) 1764-24AWA 1764-24BWA 1764-28BXB Height (A) DIN latch open: 138 mm (5.43 in.), DIN latch closed: 118 mm (4.65 in.) Width (B) 168 mm (6.62 in.) Depth (C) 87 mm (3.43 in.) (1) See Controller Dimensions on page A-9 for more dimensional information. Controller Spacing The base unit is designed to be mounted horizontally, with the Compact™ expansion I/O extending to the right of the base unit. Allow 50 mm (2 in.
Installing Your Controller 2-13 Mounting the Controller ATTENTION ! Do not remove protective debris strips until after the base and all other equipment in the panel near the base is mounted and wiring is complete. The debris strips are there to prevent drill fragments, wire strands and other dirt from getting into the controller. Once wiring is complete, remove protective debris strips and install processor unit. Failure to remove strips before operating can cause overheating.
2-14 Installing Your Controller TIP If additional I/O modules are required for the application, remove the ESD barrier to install expansion I/O modules. A maximum of 16 I/O modules may be connected to the base. (See page 1-7 for system requirements.) The I/O module’s current requirements and power consumption may further limit the number of modules connected to the base. See System Loading and Heat Dissipation on page F-1.
Installing Your Controller 2-15 To install your base unit on the DIN rail: 1. Mount your DIN rail. (Make sure that the placement of the base unit on the DIN rail meets the recommended spacing requirements, see Controller Spacing on page 2-12. Refer to the mounting template from the inside back cover of the MicroLogix 1500 Programmable Controller Base Units Installation Instructions, publication 1764-IN001. 2. Hook the top slot over the DIN rail. 3.
2-16 Installing Your Controller Base Unit Panel Mounting Mount to panel using #8 or M4 screws. Mounting Template To install your base unit using mounting screws: 1. Remove the mounting template from the inside back cover of the MicroLogix 1500 Programmable Controller Base Units Installation Instruction, publication 1764-IN001. 2. Secure the template to the mounting surface. (Make sure your base unit is spaced properly, see Controller Spacing on page 2-12). 3. Drill holes through the template. 4.
Installing Your Controller Installing Controller Components 2-17 Prevent Electrostatic Discharge ATTENTION ! ATTENTION ! Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. Follow these guidelines when you handle any module: • Touch a grounded object to discharge static potential. • Wear an approved wrist-strap grounding device. • Do not touch the bus connector or connector pins. • Do not touch circuit components inside the module.
2-18 Installing Your Controller 1. Be sure base unit power is off. 2. Slide the processor into the base unit using the guide rails for alignment. 3. Push until a click is heard. Be careful not to push on the connector when installing the 1764-LRP processor. IMPORTANT It is critical that the processor is fully engaged and locked into place. 4. Make sure the actuator is pushed closed. 5. To remove the processor from the base unit, make sure base unit power is off.
Installing Your Controller 2-19 Data Access Tool (DAT) 1. Remove cover from processor. 2. Holding the DAT in the proper orientation (as shown), place the DAT onto processor. Align DAT port on the processor with the plug on the DAT. 3. Firmly seat DAT on processor; make sure it seats into place.
2-20 Installing Your Controller 4. To remove DAT, grasp using finger areas and pull upward. Memory Module/Real-Time Clock 1. Remove the cover (or DAT if installed) from the processor as shown below. ATTENTION ! Publication 1764-UM001B-EN-P - April 2002 Electrostatic discharge can damage semiconductor devices inside the base and processor units. Do not touch the connector pins or other sensitive areas.
Installing Your Controller 2-21 2. Align connector on the memory module with the connector pins on the processor. 3. Firmly seat the memory module in the processor making sure the locking tabs click into place. 4. Replace the cover (or DAT if used).
2-22 Installing Your Controller Compact I/O Attach and Lock Module (Module-to-Controller or Module-to-Module) A Compact I/O module can be attached to the controller or an adjacent I/O module before or after mounting to the panel or DIN rail. The module can be detached and replaced while the system is mounted to a panel or DIN rail. ATTENTION ! ATTENTION ! Publication 1764-UM001B-EN-P - April 2002 Remove power before removing or inserting an I/O module.
Installing Your Controller 2-23 3 4 1 2 6 5 1 To attach and lock modules: Remove ESD barrier when attaching I/O modules to a MicroLogix 1500 base unit. TIP 1. Disconnect power. 2. Check that the bus lever of the module to be installed is in the unlocked (fully right) position. 3. Use the upper and lower tongue-and-groove slots (1) to secure the modules together (or to a controller). 4. Move the module back along the tongue-and-groove slots until the bus connectors (2) line up with each other. 5.
2-24 Installing Your Controller 7. Attach an end cap terminator (5) to the last module in the system by using the tongue-and-groove slots as before. 8. Lock the end cap bus terminator (6). IMPORTANT A 1769-ECR right end cap (or a 1769-ECL left end cap if I/O bank is located below the controller) must be used to terminate the end of the serial communication bus. See Controller Dimensions on page A-9 for mounting dimensions.
Chapter 3 Wiring Your Controller This chapter describes how to wire your controller. Topics include: • • • • • wiring requirements using surge suppressors grounding guidelines sinking and sourcing circuits wiring diagrams, input voltage ranges, and output voltage ranges • minimizing noise Wiring Requirements Wire Type Wire Size(1) Wiring Torque 1.13 Nm (10 in-lb) rated 1.
3-2 Wiring Your Controller Wiring Recommendation ATTENTION Before you install and wire any device, disconnect power to the controller system. ! ATTENTION ! Calculate the maximum possible current in each power and common wire. Observe all electrical codes dictating the maximum current allowable for each wire size. Current above the maximum ratings may cause wiring to overheat, which can cause damage.
Wiring Your Controller 3-3 Wiring without Spade Lugs When wiring without spade lugs, it is recommended to keep the finger-safe covers in place. Loosen the terminal screw and route the wires through the opening in the finger-safe cover. Tighten the terminal screw making sure the pressure plate secures the wire. Finger-Safe Cover terminal screw torque: 1.13 Nm (10 in-lbs) rated 1.3 Nm (12 in-lbs) max. Wiring with Spade Lugs The diameter of the terminal screw head is 5.5 mm (0.220 in.).
3-4 Wiring Your Controller Using Surge Suppressors Inductive load devices, such as motor starters and solenoids, require the use of some type of surge suppression to protect and extend the operating life of the controller’s output contacts. Switching inductive loads without surge suppression can significantly reduce the life expectancy of relay contacts. By adding a suppression device directly across the coil of an inductive device, you prolong the life of the output or relay contacts.
Wiring Your Controller 3-5 Surge Suppression for Inductive ac Load Devices Output Device Varistor Output Device Output Device RC Network Surge Suppressor If you connect an expansion I/O triac output to control an inductive load, we recommend that you use varistors to suppress noise. Choose a varistor that is appropriate for the application.
3-6 Wiring Your Controller Recommended Surge Suppressors Use the Allen-Bradley surge suppressors shown in the following table for use with relays, contactors, and starters.
Wiring Your Controller 3-7 This product is intended to be mounted to a well grounded mounting surface such as a metal panel. Refer to the Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1, for additional information. Additional grounding connections from the mounting tabs or DIN rail, if used, are not required unless the mounting surface cannot be grounded. You must also provide an acceptable grounding path for each device in your application.
3-8 Wiring Your Controller Wiring Diagrams This section shows the wiring diagrams for the MicroLogix 1500 controllers. Controllers with dc inputs can be wired as either sinking or sourcing configuration. (Sinking and sourcing does not apply to ac inputs.) See pages 3-12 through 3-15 for sinking and sourcing wiring diagrams.
Wiring Your Controller 3-9 Terminal Block Layouts The base unit terminal block layouts are shown below. The shading on the labels indicates how the terminals are grouped. A detail of the groupings is shown in the table following the terminal block layouts.
3-10 Wiring Your Controller Terminal Groupings Controller 1764-24BWA 1764-24AWA 1764-28BXB Controller 1764-24BWA 1764-24AWA 1764-28BXB Sinking and Sourcing Input Circuits Inputs Input Group Group 0 Group 1 Group 2 Group 0 Group 1 Group 2 Group 0 Group 1 Group 2 Common Terminal DC COM 0 DC COM 1 DC COM 2 AC COM 0 AC COM 1 AC COM 2 DC COM 0 DC COM 1 DC COM 2 Input Terminal I/0 through I/3 I/4 through I/7 I/8 through I/11 I/0 through I/3 I/4 through I/7 I/8 through I/11 I/0 through I/3 I/4 through I
Wiring Your Controller 3-11 1764-24AWA Wiring Diagram Input Terminals L2 NOT AC IN 1 USED COM 0 NOT USED IN 0 IN 3 IN 4 AC IN 9 COM 2 IN 6 AC IN 2 COM 1 IN 5 IN 7 IN 8 IN 11 IN 10 L1 L2 L1 “NOT USED” terminals are not intended for use as connection points.
3-12 Wiring Your Controller 1764-24BWA Wiring Diagram with Sinking Inputs Input Terminals +24V DC IN 1 POWER COM 0 OUT COM IN 0 IN 3 IN 2 IN 4 DC IN 5 COM 1 -DC DC COM 2 IN 6 IN 7 IN 8 IN 9 IN 11 IN 10 +DC Output Terminals CR CR L2 (Lo) VAC VAC/ VAC/ VAC/ VAC/ VAC/ OUT 5 OUT 7 OUT 8 OUT 10 NEUT VDC 0 VDC 1 VDC 2 VDC 3 VDC 4 120/240 EARTH VAC/ VAC GND OUT 0 OUT 1 OUT 2 OUT 3 OUT 4 OUT 6 VDC 5 OUT 9 OUT 11 (Hi) L1 Publication 1764-UM001B-EN-P - April 2002 CR CR CR CR
Wiring Your Controller 3-13 1764-24BWA Wiring Diagram with Sourcing Inputs Input Terminals +24V POWER DC IN 1 OUT COM 0 COM IN 0 IN 2 IN 3 IN 4 IN 6 DC IN 5 COM 1 DC IN 9 COM 2 IN 7 IN 8 IN 11 IN 10 +DC -DC Output Terminals CR L2 CR (Lo) VAC VAC/ VAC/ VAC/ VAC/ VAC/ NEUT VDC 0 VDC 1 VDC 2 VDC 3 VDC 4 OUT 5 OUT 7 OUT 8 OUT 10 120/240 EARTH VAC/ OUT 0 OUT 1 OUT 2 OUT 3 OUT 4 OUT 6 OUT 9 OUT 11 VAC GND VDC 5 L1 (Hi) CR CR CR CR Publication 1764-UM001B-EN-P - April 2002
3-14 Wiring Your Controller 1764-28BXB Wiring Diagram with Sinking Inputs Input Terminals -DC +DC -DC +DC NOT DC IN 1 USED COM 0 NOT IN 0 USED IN 3 IN 2 IN 4 IN 6 DC IN 5 COM 1 DC IN 9 COM 2 IN 7 IN 8 IN 11 IN 13 IN 15 IN 10 IN 12 IN 14 “NOT USED” terminals are not intended for use as connection points.
Wiring Your Controller 3-15 1764-28BXB Wiring Diagram with Sourcing Outputs Input Terminals +DC -DC +DC -DC NOT DC IN 1 USED COM 0 NOT IN 0 USED IN 3 IN 2 IN 4 IN 6 DC IN 5 COM 1 DC IN 9 COM 2 IN 7 IN 8 IN 11 IN 13 IN 15 IN 10 IN 12 IN 14 “NOT USED” terminals are not intended for use as connection points.
3-16 Wiring Your Controller Controller I/O Wiring Minimizing Electrical Noise Because of the variety of applications and environments where controllers are installed and operating, it is impossible to ensure that all environmental noise will be removed by input filters. To help reduce the effects of environmental noise, install the MicroLogix 1500 system in a properly rated (i.e. NEMA) enclosure. Make sure that the MicroLogix 1500 system is properly grounded.
Wiring Your Controller 3-17 1.0 0.9 0.8 Transient Pulse Duration as a Function of Load Current Time - Duration of Transient (ms) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.
3-18 Wiring Your Controller Publication 1764-UM001B-EN-P - April 2002
Chapter 4 Communication Connections This chapter describes how to set up communications for your control system. The method you use and cabling required depend on your application. This chapter also describes how the controller establishes communication with the appropriate network.
4-2 Communication Connections TIP The default configuration is present when: • The controller is powered-up for the first time. • The communications toggle push button specifies default communications (the DCOMM LED is on). • An OS upgrade is completed. For more information about communications, see Understanding Communication Protocols on page E-1. Communications Toggle Push Button The Communications Toggle Push Button is located on the processor.
Communication Connections Connecting to the RS-232 Port 4-3 DF1 Full-Duplex Communication Parameters When a communication channel is configured for DF1 Full-Duplex, the following parameters can be changed. Table 4.2 DF1 Full-Duplex Configuration Parameters Parameter Options Baud Rate 300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.
4-4 Communication Connections Channel 0 We recommend using an Advanced Interface Converter (AIC+), catalog number 1761-NET-AIC, or similar optical isolator, as shown below. See page 4-16 for specific AIC+ cabling information.
Communication Connections 4-5 Using a Modem You can use modems to connect a personal computer to one MicroLogix 1500 controller (using DF1 Full-Duplex protocol), or to multiple controllers (using DF1 Half-Duplex protocol), or Modbus Slave RTU protocol, as shown in the following illustration. Do not use DH-485 protocol through modems under any circumstance.
4-6 Communication Connections Constructing Your Own Modem Cable If you construct your own modem cable, the maximum cable length is 15.24 m (50 ft) with a 25-pin or 9-pin connector.
Communication Connections 4-7 Connecting to a DF1 Half-Duplex Network When a communication port is configured for DF1 Half-Duplex Slave, available parameters include: Table 4.3 DF1 Half-Duplex Configuration Parameters Parameter Options Baud Rate 300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.
4-8 Communication Connections DF1 Half-Duplex Master-Slave Network Use this diagram for DF1 Half-Duplex Master-Slave protocol without hardware handshaking.
Communication Connections 4-9 DF1 Half-Duplex Network (Using PC and Modems) Rockwell Software RSLinx 2.0 (or higher), SLC 5/03, SLC 5/04, and SLC 5/05, or PLC-5 processors configured for DF1 Half-Duplex Master.
4-10 Communication Connections Connecting to a DH-485 Network The following network diagrams provide examples of how to connect MicroLogix 1500 controllers to the DH-485 network using the Advanced Interface Converter (AIC+, catalog number 1761-NET-AIC). For more information on the AIC+, see the Advanced Interface Converter and DeviceNet Interface Installation Instructions, Publication 1761-5.11.
Communication Connections 4-11 Typical 3-Node Network (Channel 0 Connection) PanelView 550 A-B PanelView RJ45 port 1761-CBL-AS09 or 1761-CBL-AS03 TERM MicroLogix 1500 with 1764-LSP or 1764-LRP Processor A B COM SHLD CHS GND TX TX TX PWR DC SOURCE CABLE EXTERNAL 1747-CP3 or 1761-CBL-AC00 1761-CBL-AM00 or 1761-CBL-HM02 Typical 3-Node Network (Channel 1 Connection) A-B A-B PanelView 550 PanelView PanelView 1761-CBL-AS09 RJ45 port or 1761-CBL-AS03 MicroLogix 1500 with 1764-LRP Processor TE
4-12 Communication Connections DH-485 Configuration Parameters When MicroLogix communications are configured for DH-485, the following parameters can be changed: Table 4.4 DF1 Full-Duplex Configuration Parameters Parameter Options Baud Rate 9600, 19.2K Node Address 1 to 31 decimal Token Hold Factor 1 to 4 See Software Considerations on page E-10 for tips on setting the parameters listed above. Recommended Tools To connect a DH-485 network, you need tools to strip and attach the shielded cable.
Communication Connections 4-13 Communication Cable Connection to the DH-485 Connector TIP A daisy-chained network is recommended. We do not recommend the following: Belden #3106A or #9842 Connector Connector Connector Incorrect Single Cable Connection When connecting a single cable to the DH-485 connector, use the following diagram.
4-14 Communication Connections Multiple Cable Connection When connecting multiple cables to the DH-485 connector, use the following diagram. to Previous Device to Next Device Table 4.6 Connections using Belden #3106A Cable For this Wire/Pair Connect this Wire To this Terminal Shield/Drain Non-jacketed Terminal 2 - Shield Blue Blue Terminal 3 - (Common) White/Orange White with Orange Stripe Terminal 4 - (Data B) Orange with White Stripe Terminal 5 - (Data A) Table 4.
Communication Connections 4-15 End-of-Line Termination Jumper Jumper Belden #3106A or #9842 Cable 1219 m (4000 ft) Maximum Jumper Connecting the AIC+ The AIC+, catalog number 1761-NET-AIC, enables MicroLogix controllers to connect to a DH-485 network when they are configured for DH-485 protocol. The AIC+ has two isolated RS-232 ports and one RS-485 port. When two MicroLogix controllers are closely positioned, you can connect a controller to each of the RS-232 ports on the AIC+.
4-16 Communication Connections Cable Selection Guide 1761-CBL-PM02 1761-CBL-AP00 Cable Length Connections from to AIC+ External Power Supply Required(1) Power Selection Switch Setting(1) 1761-CBL-AP00 1761-CBL-PM02 45cm (17.7 in) 2m (6.
Communication Connections 4-17 1747-CP3 1761-CBL-AC00 Cable Length Connections from to AIC+ External Power Power Selection (1) Supply Required Switch Setting(1) 1747-CP3 1761-CBL-AC00 3m (9.8 ft) 45cm (17.
4-18 Communication Connections 1761-CBL-PM02 (or equivalent) Cable Wiring Diagram 5 4 3 2 1 9 8 7 6 6 78 3 5 4 Publication 1764-UM001B-EN-P - April 2002 Programming Device Controller 9-Pin D-Shell 8-Pin Mini Din 9 RI 24V 1 8 CTS GND 2 7 RTS RTS 3 6 DSR RXD 4 5 GND DCD 5 4 DTR CTS 6 3 TXD TXD 7 2 RXD GND 8 1 DCD 1 2
Communication Connections 4-19 Recommended User-Supplied Components The components in Table 4.8 can be purchased from your local electronics supplier. Table 4.8 User Supplied Components Component Recommended Model external power supply and chassis ground power supply rated for 20.4-28.
4-20 Communication Connections Safety Considerations This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or non-hazardous locations only. . WARNING ! EXPLOSION HAZARD This product must be installed in an enclosure. All cables connected to the product must remain in the enclosure or be protected by conduit or other means. See Safety Considerations on page 2-3 for additional information. Installing and Attaching the AIC+ 1.
Communication Connections 4-21 Set the DC Power Source selector switch to EXTERNAL before connecting the power supply to the AIC+. The following illustration shows where to connect external power for the AIC+. Bottom View 24VDC DC NEUT CHS GND ATTENTION ! Always connect the CHS GND (chassis ground) terminal to the nearest earth ground. This connection must be made whether or not an external 24V dc supply is used.
4-22 Communication Connections Connecting to DeviceNet You can connect a MicroLogix 1500 using DF1 Full-Duplex protocol to a DeviceNet network using the DeviceNet Interface (DNI), catalog number 1761-NET-DNI. For additional information on using the DNI, refer to the DeviceNet Interface User Manual, publication 1761-6.5. The following figure shows the external wiring connections of the DNI. V– CAN_L NET SHIELD CAN_H DeviceNet Node (Port 1) (Replacement connector part no.
Communication Connections Connecting to Ethernet 4-23 You can connect a MicroLogix 1500 to an Ethernet network using the Ethernet Interface (ENI), catalog number 1761-NET-ENI. For additional information on using the ENI, refer to the Ethernet Interface User Manual, publication 1761-UM006. The following figure shows the external wiring connections of the ENI.
4-24 Communication Connections RS-232 Connections Port 2 of the ENI is an 8-pin mini-DIN RS-232 port that provides connection to DF1 compatible RS-232 devices. The connector pin assignments are shown below. 7 6 8 8-pin mini-DIN 3 5 4 2 Pin Port 2 1 24V dc 2 ground (GND) 3 no connection 4 ENI input data, RxD 5 no connection 6 no connection 7 ENI output data, TxD 8 ground (GND) 1 The table below describes the RS-232 compatible cables.
Chapter 5 Using Trim Pots and the Data Access Tool (DAT) Trim Pot Operation The processor has two trimming potentiometers (trim pots) which allow modification of data within the controller. Adjustments to the trim pots change the value in the corresponding Trim Pot Information (TPI) register. The data value of each trim pot can be used throughout the control program as timer, counter, or analog presets depending upon the requirements of the application.
5-2 Using Trim Pots and the Data Access Tool (DAT) Trim Pot Information Function File The composition of the Trim Pot Information (TPI) Function File is described in the MicroLogix 1200 and MicroLogix 1500 Instruction Set Reference Manual, publication 1762-RM001. Error Conditions If the controller detects a problem/error with either trim pot, the last values read remain in the data location, and an error code is put in the error code byte of the TPI file for whichever trim pot had the problem.
Using Trim Pots and the Data Access Tool (DAT) 5-3 Feature Function Digital Display Displays address elements, data values, faults and errors. Up/Down Key Selects element numbers and change data values. The up/down key scrolls when held. F1 Key and Indicator Light Controls the F1 status bit. When the F1 key is pressed or latched, the F1 indicator LED is lit. F2 Key and Indicator Light Controls the F2 status bit. When the F2 key is pressed or latched, the F2 indicator LED is lit.
5-4 Using Trim Pots and the Data Access Tool (DAT) DAT Function File DAT configuration is stored in the processor in a specialized configuration file called the DAT Function File. The DAT Function File, which is part of the user’s control program, is described in the MicroLogix 1200 and MicroLogix 1500 Instruction Set Reference Manual, publication 1762-RM001. Following a successful power-up sequence, the DAT enters the bit monitoring mode.
Using Trim Pots and the Data Access Tool (DAT) 5-5 Understanding the DAT Display When the DAT enters either the bit or integer mode, the element number and its data are displayed, as shown below. The element number is either the integer or bit location.
5-6 Using Trim Pots and the Data Access Tool (DAT) Entering Bit Mode Bit mode allows you to view and modify up to 48 contiguous bit locations in the controller. The DAT enters the bit mode automatically following a successful power-up. The bit mode can also be selected by pressing the BIT key. If the bit mode was previously active, the DAT displays the last bit element monitored. If the integer mode was active, the DAT displays the first bit element in the data file.
Using Trim Pots and the Data Access Tool (DAT) 5-7 5. Press ENTER to load the new data. Press ESC or INT/BIT to discard the new data. F1 and F2 Functions The function keys, F1 and F2, correspond to bits and can be used throughout the control program as desired. They have no effect on bit or integer monitoring. Each key has two corresponding bits in the DAT function file. The bits within the DAT function file are shown in the table below.
5-8 Using Trim Pots and the Data Access Tool (DAT) working screen consists of three dashes that move across the display from left to right. While the working screen is displayed, key presses are not recognized. Once the DAT receives data from the controller, it returns to its normal mode of operation. If you encounter excessive working screen conditions, you can minimize the effect by adding an SVC instruction to the control program.
Using Trim Pots and the Data Access Tool (DAT) 5-9 Pressing ESC while the fault is being displayed returns the DAT to its previous mode. The fault is not removed from the controller, just from the DAT display screen. The fault that was on screen will not display again and cannot be “recalled”. If a new fault is detected, it will be displayed. If the initial fault is cleared and returns at a later time, the DAT will display the fault at that time.
5-10 Using Trim Pots and the Data Access Tool (DAT) DAT Error Codes Error Code Description Caused by Recommended Action 00 Interface time-out Communication traffic Add SVC instructions to ladder program 01 to 02 Power-up test failure Internal failure Remove and re-insert the DAT. If failure persists, replace the unit. 03 to 07 internal error Internal failure Remove and re-insert the DAT. If failure persists, replace the unit.
Chapter 6 Using Real-Time Clock and Memory Modules Five modules with different levels of functionality are available for use with the MicroLogix 1500 controller. Catalog Number Function Memory Size 1764-RTC Real-Time Clock not applicable 1764-MM1 Memory Module 8K 1764-MM1RTC Memory Module and Real-Time Clock 8K 1764-MM2(1) Memory Module 16K 1764-MM2RTC(1) Memory Module and Real-Time Clock 16K (1) For 1764-LRP programs greater than 8k, use the 1764-MM2 or 1764-MM2RTC.
6-2 Using Real-Time Clock and Memory Modules Accuracy The following table indicates the expected accuracy of the real-time clock at various temperatures. Ambient Temperature Accuracy(1) 0°C (+32°F) +34 to -70 seconds/month +25°C (+77°F) +36 to -68 seconds/month +40°C (+104°F) +29 to -75 seconds/month +55°C (+131°F) -133 to -237 seconds/month (1) These numbers are expected worst case values over a 31 day month.
Using Real-Time Clock and Memory Modules 6-3 Use the Disable Clock button in your programming device to disable the real-time clock before storing a module. This decreases the drain on the battery during storage. Table 6.
6-4 Using Real-Time Clock and Memory Modules Program Compare The memory module can also provide application security, allowing you to specify that if the program stored in the memory module does not match the program in the controller, the controller will not enter an executing (run or remote run) mode. To enable this feature, set the S:2/9 bit in the system status file. Refer to the MicroLogix 1200 and MicroLogix 1500 Instruction Set Reference Manual, publication 1762-RM001, for more information.
Using Real-Time Clock and Memory Modules 6-5 Memory Module Write Protection The memory module supports write-once, read-many behavior. Write protection is enabled using your programming software. IMPORTANT Once set, write protection cannot be removed. A change cannot be made to the control program or data stored in a write-protected memory module. If a change is required, you must use a different memory module.
6-6 Using Real-Time Clock and Memory Modules Publication 1764-UM001B-EN-P - April 2002
Appendix A Specifications Controller Specifications Table A.1 General Specifications Description 1764-24BWA 1764-24AWA 1764-28BXB Number of I/O 12 inputs 12 outputs 12 inputs 12 outputs 16 inputs 12 outputs Line Power 85 to 265V ac at 47 to 63 Hz 85 to 265V ac at 47 to 63 Hz 20.
A-2 Specifications Table A.1 General Specifications Description 1764-24BWA 1764-24AWA 1764-28BXB Electrical/EMC The module has passed testing at the following levels: • EN61000-4-2: 4 kV contact, 8 kV air, 4 kV indirect • EN61000-4-3: 10 V/m • EN61000-4-4: 2 kV, 5 kHz; communications cable: 1 kV, 5 kHz • EN61000-4-5: communications cable1 kv galvanic gun -I/O: 2 kV CM, 1 kV DM, -Power Supply (1764-24AWA/1764-24BWA): 4 kV CM, 2 kV DM -Power Supply (1764-28BXB): 0.5 kV CM, 0.
Specifications A-3 Figure 1.2 Input Power Required 30 Input Power Required (Watts) 25 20 15 10 5 0 0 2 4 6 8 10 12 14 16 18 Power Consumption (Watts) Table A.2 Input Specifications Description 1764-24AWA 1764-24BWA and 1764-28BXB Inputs 0 thru 7 Inputs 8 and Higher 10 to 30.0V dc at 30°C (86°F) 10 to 26.4V dc at 55°C (131°F) On-State Voltage Range 79 to 132V ac 14 to 30.0V dc at 30°C (86°F) 14 to 26.
A-4 Specifications Table A.3 Response Times for High-Speed dc Inputs 0 Through 7 (applies to 1764-24BWA and 1764-28BXB) Filter Maximum High-Speed Counter Setting (ms) Frequency at 50% Duty Cycle (KHz) Minimum ON Delay (ms) Maximum Minimum ON Delay OFF Delay (ms) (ms) Maximum OFF Delay (ms) 20.000 0.025 0.005 0.025 0.005 0.025 6.700 0.075 0.040 0.075 0.045 0.075 5.000 0.100 0.050 0.100 0.060 0.100 2.000 0.250 0.170 0.250 0.210 0.250 1.000 0.500 0.370 0.500 0.330 0.500 0.
Specifications A-5 The relay current must stay within the limits defined in Tables A.5 and A.6. IMPORTANT Table A.5 Relay Contact Rating Table 1764-24AWA, -24BWA, -28BXB Maximum Volts Amperes Make Break 240V ac 7.5A 0.75A 120V ac 15A Amperes Continuous Voltamperes Make Break 2.5A 1800VA 180VA(2) 1.5A 125V dc 0.22A 1.0A 28VA 24V dc 1.2A(1) 2.
A-6 Specifications Table A.7 1764-28BXB FET Output Specifications Specification General Operation (Outputs 2 thru 7) High Speed Operation(1) (Outputs 2 and 3 Only) peak current 4.0A Not Applicable maximum surge duration 10 msec Not Applicable maximum rate of repetition at 30°C (86°F) once every second Not Applicable maximum rate of repetition at 55°C (131°F) once every 2 seconds Not Applicable Current per Common maximum total 6A Not Applicable On-State Current minimum 2.
Specifications A-7 Table A.
A-8 Specifications Table A.
Specifications Controller Dimensions See page 2-12 for Base Unit Mounting Dimensions. 168 mm (6.62 in) 35 mm (1.38 in) 147.4 mm (5.81 in) 35 mm (1.38 in) 118 mm (4.65 in) 59 mm (2.32 in) 59 mm (2.32 in) 122.6 mm (4.83 in) 147 mm (5.79 in) 132 mm (5.19 in) A-9 13.5 mm (0.53 in) Compact I/O Dimensions 14.7 mm (0.58 in) Panel Mounting For more than 2 modules: (number of modules - 1) X 35 mm (1.38 in.) Refer to host controller for this dimension . 132 (5.197) 122.6±0.2 (4.826±0.008) 35 (1.
A-10 Specifications End Cap 32 mm (1.26 in.) 18 mm (0.71 in.) This illustration shows the 1769-ECR right end cap. For the 1769-ECL left end cap, the drawing would be reversed. 118 mm (4.65 in.) Dimensions are in mm (inches).
Appendix B Replacement Parts This chapter contains the following information: • a table of MicroLogix 1500 replacement parts • procedure for replacing the lithium battery • illustrations of the MicroLogix 1500 replacement doors and terminal blocks MicroLogix 1500 Replacement Kits 1 The table below provides a list of replacement parts and their catalog number. Description Catalog Number Lithium Battery (See page B-2.) 1747-BA ESD Barrier 1764-RPL-TRM1 Base Terminal Doors (See page B-6.
B-2 Replacement Parts Lithium Battery (1747-BA) IMPORTANT When the processor’s Battery Low indicator is lit, install a backup battery immediately. After the indicator turns on, the battery lasts for at least: • 14 days for the 1764-LSP • 7 days for the 1764-LRP Installing Follow the procedure below to ensure proper replacement battery installation. IMPORTANT Do not remove the permanent battery when installing replacement battery. 1. Insert battery into replacement battery pocket with wires facing up.
Replacement Parts B-3 Battery Handling Follow the procedure below to ensure proper battery operation and reduce personnel hazards. • Use only for the intended operation. • Do not ship or dispose of cells except according to recommended procedures. • Do not ship on passenger aircraft. ATTENTION ! • Do not charge the batteries. An explosion could result or the cells could overheat causing burns. • Do not open, puncture, crush, or otherwise mutilate the batteries.
B-4 Replacement Parts Three or More Batteries Procedures for the transportation of three or more batteries shipped together within the United States are specified by the Department of Transportation (DOT) in the Code of Federal Regulations, CFR49, “Transportation.” An exemption to these regulations, DOT - E7052, covers the transport of certain hazardous materials classified as flammable solids.
Replacement Parts B-5 For disposal, batteries must be packaged and shipped in accordance with transportation regulations, to a proper disposal site. The U.S. Department of Transportation authorizes shipment of “Lithium batteries for disposal” by motor vehicle only in regulation 173.1015 of CFR 49 (effective January 5, 1983). For additional information contact: U.S. Department of Transportation Research and Special Programs Administration 400 Seventh Street, S.W. Washington, D.C.
B-6 Replacement Parts Replacement Doors The following figures illustrate the procedure for installing the MicroLogix 1500 replacement doors.
Appendix C Troubleshooting Your System This chab pter describes how to troubleshoot your controller. Topics include: • • • • Understanding Controller LEDs understanding the controller LED status controller error recovery model identifying controller faults calling Rockwell Automation for assistance The controller status LEDs provide a mechanism to determine the current status of the controller if a programming device is not present or available. D.C.
C-2 Troubleshooting Your System LED Color Indicates INPUTS off input is not energized amber input is energized (logic status) off output is not energized amber output is energized (logic status) OUTPUTS (1) When using a 1764-LRP processor, the DCOMM LED applies only to Channel 0. When Operating Normally The POWER and RUN LEDs are on. If a force condition is active, the FORCE LED turns on and remains on until all forces are removed.
Troubleshooting Your System Controller Error Recovery Model Identify the error code and description. No C-3 Use the following error recovery model to help you diagnose software and hardware problems in the micro controller. The model provides common questions you might ask to help troubleshoot your system. Refer to the recommended pages within the model for further help. Is the error hardware related? Start Yes Refer to page C-2 for probable cause and recommended action.
C-4 Troubleshooting Your System Identifying Controller Faults While a program is executing, a fault may occur within the operating system or your program. When a fault occurs, you have various options to determine what the fault is and how to correct it. This section describes how to clear faults and provides a list of possible advisory messages with recommended corrective actions.
Troubleshooting Your System C-5 Manual, publication 1762-RM001, for information on creating a user fault subroutine. Fault Messages Refer to the MicroLogix 1200 and 1500 Instruction Set Reference Manual, publication 1762-RM001, for the controller fault messages that can occur during operation of the MicroLogix 1500 programmable controllers. Each fault message includes the error code description, the probable cause, and the recommended corrective action.
C-6 Troubleshooting Your System Publication 1764-UM001B-EN-P - April 2002
Appendix D Upgrading Your Operating System The operating system (OS) can be upgraded through the communication port on the controller. In order to download a new operating system, you must have the following: • ControlFLASH™ Upgrade Kit containing the new OS • a Windows® 95, Windows® 98, Windows NT™, or Windows® 2000 based computer to run the download software.
D-2 Upgrading Your Operating System Performing the Upgrade The following steps occur during the upgrade process. 1. Controller mode and communications parameters are checked. 2. Download begins. 3. During the download, the Force, Battery, and Comms LEDs perform a walking bit pattern. 4. When the download is complete, the integrity of the new OS is checked. If the new OS is corrupt, the controller sends an error message to the computer and flashes the Missing or Corrupt OS LED pattern.
Appendix E Understanding Communication Protocols Use the information in this appendix to understand the differences in communication protocols. The following protocols are supported from the RS-232 communication channel: • • • • DF1 Full-Duplex DF1 Half-Duplex Slave DH-485 Modbus RTU Slave (1764-LSP and 1764-LRP Series B Processors only) • ASCII (1764-LSP and 1764-LRP Series B Processors only) See Chapter 4 for information about required network devices and accessories.
E-2 Understanding Communication Protocols MicroLogix 1500 controllers support the DF1 Full-Duplex protocol via RS-232 connection to external devices such as computers, controllers, and other interface devices that support DF1 Full-Duplex. For information about required network connecting equipment and examples of DF1 Full-Duplex connections, see Chapter 4. DF1 Half-Duplex Protocol DF1 Half-Duplex protocol is a multi-drop single master/multiple slave network.
Understanding Communication Protocols E-3 Considerations When Communicating as a DF1 Slave on a Multi-drop Link When communication is between either your programming software and a MicroLogix Programmable Controller or between two MicroLogix 1500 Programmable Controllers via slave-to-slave communication on a larger multi-drop link, the devices depend on a DF1 Half-Duplex Master to give each of them access in a timely manner.
E-4 Understanding Communication Protocols For multi-drop modem connections, or for point-to-point modem connections that require RTS/CTS handshaking, use DF1 Half-Duplex slave protocol. IMPORTANT TIP Never attempt to use DH-485 protocol through modems under any circumstance.
Understanding Communication Protocols E-5 Radio Modems Radio modems may be implemented in a point-to-point topology supporting either Half-Duplex or Full-Duplex communications, or in a multi-drop topology supporting Half-Duplex communications between three or more modems. Line Drivers Line drivers, also called short-haul “modems”, do not actually modulate the serial data, but rather condition the electrical signals to operate reliably over long transmission distances (up to several miles).
E-6 Understanding Communication Protocols The DH-485 protocol supports two classes of devices: initiators and responders. All initiators on the network get a chance to initiate message transfers. To determine which initiator has the right to transmit, a token passing algorithm is used. The following section describes the protocol used to control message transfers on the DH-485 network. DH-485 Token Rotation A node holding the token can send a message onto the network.
Understanding Communication Protocols E-7 Devices that Use the DH-485 Network In addition to the MicroLogix 1500 controllers, the devices shown in the following table also support the DH-485 network. Table E.2 Allen-Bradley Devices that Support DH-485 Communication Catalog Number Description Installation Function Publication Bulletin 1761 Controllers MicroLogix 1000 Series C or higher These controllers support DH-485 communications. 1761-6.
E-8 Understanding Communication Protocols Table E.2 Allen-Bradley Devices that Support DH-485 Communication Catalog Number Description Installation Function Publication 1747-PT1 Hand-Held Terminal NA Provides hand-held programming, monitoring, configuring, and troubleshooting capabilities for SLC 500 processors.
Understanding Communication Protocols E-9 Hardware Considerations You need to decide the length of the communication cable, where you route it, and how to protect it from the environment where it will be installed. When the communication cable is installed, you need to know how many devices are to be connected during installation and how many devices will be added in the future. The following sections will help you understand and plan the network.
E-10 Understanding Communication Protocols interference. If you route the cable through conduit, follow these additional recommendations: – Use ferromagnetic conduit near critical sources of electrical interference. You can use aluminum conduit in non-critical areas. – Use plastic connectors to couple between aluminum and ferromagnetic conduit. Make an electrical connection around the plastic connector (use pipe clamps and the heavy gauge wire or wire braid) to hold both sections at the same potential.
Understanding Communication Protocols E-11 Setting Node Addresses The best network performance occurs when node addresses are assigned in sequential order. Initiators, such as personal computers, should be assigned the lowest numbered addresses to minimize the time required to initialize the network. The valid range for the MicroLogix 1500 controllers is 1-31 (controllers cannot be node 0). The default setting is 1.
E-12 Understanding Communication Protocols When using this method (as shown in the following illustration): • PLC-5 devices can send read and write commands to MicroLogix 1500 controllers. • MicroLogix 1500 controllers can respond to MSG instructions received. • The MicroLogix 1500 controllers can initiate MSG instructions to devices on the DH+ network. • PC can send read and write commands to MicroLogix 1500 controllers. • PC can do remote programming of MicroLogix 1500 controllers.
Understanding Communication Protocols Modbus RTU Slave Communication Protocol (MicroLogix 1764-LSP and 1764-LRP Series B and later processors only) E-13 Modbus RTU Slave is a Half-Duplex, master-slave communications protocol. The Modbus network master initiates and controls all communications on the network. Modbus protocol allows a single master to communicate with a maximum of 255 slave devices.
E-14 Understanding Communication Protocols Refer to the MicroLogix 1200 and MicroLogix 1500 Programmable Controllers Instruction Set Reference Manual, publication 1762-RM001 for detailed configuration information. When the driver is set to ASCII, the following parameters can be changed: Table E.4 ASCII Channel Configuration Parameters Parameter Description Programming Software Default Baud Rate Toggles between the communication rate of 300, 600, 1200, 2400, 4800, 9600, 19.2K, and 38.4K.
Appendix F System Loading and Heat Dissipation System Loading Limitations When you connect MicroLogix accessories and expansion I/O, an electrical load is placed on the base unit power supply. This section shows how to calculate the load and validate that the system will not exceed the capacity of the base unit power supply or expansion power supply. The following example is provided to illustrate system loading validation.
F-2 System Loading and Heat Dissipation Selecting System Devices 1. Use Table F.1 to select the processor and optional communications or display devices. Enter a 1 in the “Select Devices” column. 2. Enter the current draw values in the “Calculated Current for System” columns. If an external power supply will be used to power communication devices, do not include their current draw values in this calculation. Add up the current draw values to determine the “SUBTOTAL1” values. Table F.
System Loading and Heat Dissipation F-3 ensure that the maximum available 4K data table size will not be exceeded. Refer to the 1769-SDN User Manual for more details. 4. Enter the current draw values in the “Calculated Current” columns. Add up the current draw values to determine the “SUBTOTAL2” values. 5. Verify that the total number of modules does not exceed the system limits using the maximum values for the base unit and Table F.5 for the expansion power supply, if used. Table F.
F-4 System Loading and Heat Dissipation Verifying the System Loading To have a valid system, both current and power requirements must be satisfied. Verifying the Base Unit Loading 1. Enter the SUBTOTAL values from Tables F.1 and F.2. Add the total current draw for the Base Unit. Verify the values are within the maximum limits. Table F.
System Loading and Heat Dissipation F-5 Table F.5 Bank 1 Power Supply Loading - Verify the Current Limits Specification Catalog Number Calculated Current for System at 5V dc (mA) Values from SUBTOTAL2 (Table F.
F-6 System Loading and Heat Dissipation Figure F.2 1769-PA2 Current with +24V dc User Load = 0.2A +5V dc Load (Amps) 2.0 1.5 Valid Operating Range 1.0 0.5 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 +24V dc Load (Amps) 0.8 0.9 1.0 0.8 0.9 1.0 Figure F.3 1769-PA2 Current with +24V dc User Load = 0.25A +5V dc Load (Amps) 2.0 1.5 Valid Operating Range 1.0 0.5 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.
System Loading and Heat Dissipation F-7 System Using a 1769-PA4 To validate your system, the total 5V dc current and 24V dc current consumed must be considered. The I/O modules connected to the PB2 should be distributed, such that the current consumed from the left and right side of the power supply never exceeds 2A at 5V and 0.8A at 24V dc with an ambient temperature of 0 to 55°C.
F-8 System Loading and Heat Dissipation Figure 8 1769-PB4 5V and 24V dc Current Total Output: 68W at 55°C or below 61W at 60°C or below 1.7 4.0 +5V Bus Load (Amps) 55˚C 3.0 2.6 2.0 1.0 0.0 0.0 60˚C 0.2 0.4 0.6 0.8 1.0 +24V Bus Load (Amps) Publication 1764-UM001B-EN-P - April 2002 1.2 1.4 1.6 1.8 2.
System Loading and Heat Dissipation Calculating Heat Dissipation Catalog Number F-9 Use this procedure when you need to determine the heat dissipation for installation in an enclosure. Use the following table. Heat Dissipation Equation or Constant Calculation Subtotal 1764-24AWA 18W + (0.3 x System Loading) 18W + (0.3 x ______ W) 1764-24BWA 20W + (0.3 x System Loading) 20W + (0.3 x ______ W) 1764-28BXB 20W + (0.3 x System Loading) 20W + (0.3 x ______ W) 1764-DAT 1.75W 1769-HSC 6.
F-10 System Loading and Heat Dissipation Publication 1764-UM001B-EN-P - April 2002
Glossary The following terms are used throughout this manual. Refer to the Allen-Bradley Industrial Automation Glossary, Publication Number AG-7.1, for a complete guide to Allen-Bradley technical terms. address A character string that uniquely identifies a memory location. For example, I:1/0 is the memory address for data located in Input file word 1, bit 0. AIC+ Advanced Interface Converter A device that provides RS-232 isolation to an RS-485 Half-Duplex communication link. (Catalog Number 1761-NET-AIC.
Glossary 2 communication scan A part of the controller’s operating cycle. Communication with devices (such as other controllers and operator interface devices) takes place during this period. control program User logic (the application) that defines the controller’s operation. controller A device, such as a programmable controller, used to control output devices. controller overhead A portion of the operating cycle used for housekeeping purposes (memory checks, tests, communications, etc.).
Glossary 3 DTE Data Terminal Equipment EMI Electromagnetic interference. embedded I/O Embedded I/O is the controller’s on-board I/O. For MicroLogix controllers, embedded I/O is all I/O residing at slot 0. expansion I/O Expansion I/O is I/O that is connected to the controller via a bus or cable. MicroLogix 1200 controllers use Bulletin 1762 expansion I/O. MicroLogix 1500 controllers use Bulletin 1769 expansion I/O. For MicroLogix controllers, expansion I/O is all I/O residing at slot 1 and higher.
Glossary 4 half-duplex A mode of communication where data transmission is limited to one direction at a time. hard disk A storage device in a personal computer. high byte Bits 8 to 15 of a word. housekeeping The portion of the scan when the controller performs internal checks and services communications. input device A device, such as a push button or a switch, that supplies an electrical signal to the controller. input scan The controller reads all input devices connected to the input terminals.
Glossary 5 jump Changes the normal sequence of program execution. In ladder programs a JUMP (JMP) instruction causes execution to jump to a specific rung in the user program. ladder logic A graphical programming format resembling a ladder-like diagram. The ladder logic programing language is the most common programmable controller language. least significant bit (LSB) The element (or bit) in a binary word that carries the smallest value of weight.
Glossary 6 modem Modulator/demodulator. Equipment that connects data terminal equipment to a communication line. modes Selected methods of operation. Example: run, test, or program. negative logic The use of binary logic in such a way that “0” represents the desired voltage level. network A series of stations (nodes) connected by some type of communication medium. A network may be made up of a single link or multiple links. nominal input current The typical amount of current seen at nominal input voltage.
Glossary 7 offset A continuous deviation of a controlled variable from a fixed point. off-state leakage current When a mechanical switch is opened (off-state), no current flows through the switch. Semiconductor switches and transient suppression components which are sometimes used to protect switches, have a small current flow when they are in the off state. This current is referred to as the off-state leakage current.
Glossary 8 processor A Central Processing Unit. (See CPU.) processor files The set of program and data files resident in the controller. program file Areas within a processor that contain the logic programs. MicroLogix controllers support multiple program files. program mode When the controller is not scanning the control program. program scan A part of the controller’s operating cycle. During the program scan, the logic program is processed and the Output Image is updated.
Glossary 9 reserved bit A location reserved for internal use. retentive data Information (data) that is preserved through power cycles. RS-232 An EIA standard that specifies electrical, mechanical, and functional characteristics for serial binary communication circuits. run mode An executing mode during which the controller scans or executes the logic program. rung A rung contains input and output instructions. During Run mode, the inputs on a rung are evaluated to be true or false.
Glossary 10 sourcing A term used to describe current flow between two devices. A sourcing device or circuit provides a power. status The condition of a circuit or system. terminal A point on an I/O module that external devices, such as a push button or pilot light, are wired to. throughput The time between when an input turns on and a corresponding output turns on or off. Throughput consists of input delays, program scan, output delays, and overhead.
Index Numerics 1764-24AWA features 1-1 1764-24AWA wiring diagram 3-11 1764-24BWA features 1-1 1764-24BWA sinking wiring diagram baud rate G-1 bit G-1 bit key 5-3 Bit Mode 5-6 block diagrams G-1 Boolean operators G-1 branch G-1 3-12 1764-24BWA sourcing wiring diagram 3-13 1764-28BXB features 1-1 1764-28BXB sinking wiring diagram 3-14 1764-28BXB sourcing wiring diagram 3-15 1764-LRP processor 1-3 1764-LSP processor 1-3 A address G-1 AIC+ applying power to 4-20 attaching to the network 4-20 connecting 4-1
2 Index connecting the system AIC+ 4-15 DeviceNet network 4-22, 4-23 DF1 fullduplex protocol 4-3 DH485 network 4-10 contactors (bulletin 100), surge suppressors for 3-6 control program G-2 ControlFlash missing/corrupt OS LED pattern D-2 sequence of operation D-2 using D-1 controller definition G-2 determining faults C-1 fault messages C-5 features 1-1 grounding 3-6 installation 2-1 mounting 2-13 overhead G-2 preventing excessive heat 2-7 troubleshooting C-1 controller error recovery model C-3 controller f
Index errors controller C-2 hardware C-2 identifying C-4 ESC key 5-3 European Union Directive compliance 2-1 executing mode G-3 expansion I/O hardware overview 1-6 F F1 Functions 5-7 F1 key 5-3 F2 Functions 5-7 F2 key 5-3 false G-3 fault recovery procedure C-4 fault routine C-4 faults automatically clearing C-4 identifying C-4 manually clearing using the fault routine C-4 FET output specifications 1764-28BXB A-5 FIFO (First-In-First-Out) G-3 file G-3 full-duplex G-3 G grounding the controller 3-6 H ha
4 Index lithium battery (1747-BA) disposing B-4 handling B-3 installing B-2 manufacturer B-4 storing B-3 transporting B-3 logic G-5 low byte G-5 M manuals, related P-2 master control relay 2-8 master control relay (MCR) G-5 master control relay circuit periodic tests 2-5 memory module data file protection 6-4 program compare 6-4 program/data backup 6-3 removal/installation under power 6-1, 6-5 Memory Module Information File 6-5 memory module/real-time clock installing 2-20 mnemonic G-5 Modbus communicat
Index program faults determining C-1 program file definition G-8 program mode G-8 program scan definition G-8 programming device G-8 programming the controller required software 1-5 PROTECTED indicator light 5-3, 5-5 protocol G-8 publications, related P-2 Purpose of this Manual P-1 R read G-8 real time clock battery low indicator bit 6-2 disabling 6-3 Real Time Clock Function File 6-1 related publications P-2 relay G-8 relay contact rating table A-5 relay logic G-8 relays surge suppressors for 3-6 remote
6 Index T U terminal G-10 throughput G-10 Trim Pot Information Function File 5-2 trim pots adjustment 5-1 error conditions 5-2 location 5-1 trim pots/mode switch cover door B-6 troubleshooting automatically clearing faults C-4 contacting Allen-Bradley for assistance C-5 controller error recovery model C-3 determining controller faults C-1 identifying controller faults C-4 manually clearing faults C-4 understanding the controller LED status C-1 using the fault routine C-4 true G-10 Publication 1764-UM
Publication 1764-UM001B-EN-P - April 2002 9 Supersedes Publication 1764-UM001A-US-P - April 2000 PN 40072-091-01(2) Copyright © 2002 Rockwell Automation. All rights reserved. Printed in the U.S.A.
