Allen Bradley Remote I/O Adapter Module (Cat. No.
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. The illustrations, charts, sample programs and layout examples shown in this guide are intended solely for example.
Summary of Changes This publication contains new and revised information not included in the last release. New Information Series A and Series B Differences The remote I/O adapter is now a series B. The series A adapters and the series B adapters process block transfers differently. Series A adapters allow block transfers to continue to occur even when an analog module is removed from its base.
SOC–2 Summary of Changes I/O Mapping I/O mapping for the series B versions of the analog modules has been added. In addition, the 1794-IR8 and 1794-IT8 module I/O mapping is also included. Change Bars The areas in this manual which are different from previous editions are marked with change bars (as shown next to this paragraph) to indicate the addition of new or revised information. Publication 1794 6.5.
Table of Contents Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1 Preface Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . What This Manual Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . Conventions . . . . . . . . . . . . . . . . . . . .
ii Table of Contents Setting the Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Starting I/O Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I/O Rack Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hold Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Last Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reply Delay . . . . . . . . . . . . . . . . . . . . . .
Table of Contents iii Analog Input Module (1794 IE8/B) Write Configuration Block . Range Selection Bits for the 1794 IE8/B Analog Input Module 4 Output Analog Module (Cat. No. 1794 OE4 Series B) . . . . . . . Analog Output Module (1794 OE4) Read . . . . . . . . . . . . . . . Analog Output Module (1794 OE4/B) Write Configuration Block Range Selection Bits for the 1794 OE4/B Analog Output Module (Word 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Input/2 Output Analog Combo Module (Cat.
Preface Using This Manual Preface Objectives Read this preface to familiarize yourself with this manual and to learn how to use it properly and efficiently. Audience We assume that you have previously used an Allen–Bradley programmable controller, that you are familiar with its features, and that you are familiar with the terminology we use. If not, read the user manual for your processor before reading this manual.
P–2 Using This Manual Conventions We use these conventions in this manual: In this manual, we show: Like this: that there is more information about a topic in another chapter in this manual that there is more information about the topic in another manual For Additional Information For additional information on FLEX I/O systems and modules, refer to the following documents: Catalog Number Publications Voltage 1794 Publication 1794 6.5.
Chapter 1 Overview of FLEX I/O and your Remote I/O Adapter Module Chapter Objectives In this chapter, we tell you about: • what the FLEX I/O system is and what it contains • how FLEX I/O modules communicate with programmable controllers • the features of your adapter module The FLEX I/O System Adapter FLEX I/O is a small, modular I/O system for distributed applications that performs all of the functions of rack-based I/O.
1–2 Overview of FLEX I/O and your Remote I/O Adapter Module How FLEX I/O Modules Communicate with Programmable Controllers Data transfer to and from the remote I/O adapter/power supply and discrete I/O modules occurs every flexbus scan. This provides the controller with updated data. The remote I/O adapter/power supply transfers data to the analog I/O module (block transfer write) and from the analog I/O module (block transfer read) using BTW and BTR instructions in your ladder diagram program.
Overview of FLEX I/O and your Remote I/O Adapter Module Hardware Components 1–3 The adapter module consists of the following major components: • • • • • diagnostic indicators reset pushbutton remote I/O wiring connections 24V dc power wiring connections address/group switch assemblies Allen Bradley ADAPTER ACTIVE FAULT Diagnostic Indicators LOCAL FAULT 24 VDC POWER SUPPLY RIO ADAPTER 1794-ASB Reset Pushbutton 24V dc Common Wiring Connections Address/Group Switches +24V dc Wiring Connections Re
1–4 Overview of FLEX I/O and your Remote I/O Adapter Module Reset Pushbutton Use the reset pushbutton to reset the adapter module and resume communication when a communication error occurs. (The adapter’s processor restart lockout switch (PRL) must be in the “locked out” position.) If the adapter is not locked out by the PRL switch, it will be automatically reset via special commands sent over the communication link. Important: Do not cycle power to the adapter to clear a fault.
Chapter 2 Installing Your Remote I/O Adapter Module Chapter Objectives This chapter describes the procedures for installing your remote I/O adapter module. These include: • power requirements • mounting the remote I/O adapter • setting the module switches European Union Directive Compliance If this product has the CE mark it is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.
2–2 Installing Your Remote I/O Adapter Module Power Requirements The Remote I/O adapter module requires a current of 450mA at 24V dc from an external power supply for flexbus operation. This is sufficient to support the flexbus current requirements one logical rack (8 modules). Remember to add this amount to current requirements for other modules using the same 24V supply. Mounting the Remote I/O Adapter The remote I/O adapter module can be DIN rail or wall/panel mounted.
Installing Your Remote I/O Adapter Module 2–3 Mounting on a Wall or Panel To mount the remote I/O adapter module on a wall or panel, you must have the 1794-NM1 mounting kit. The kit contains a special plate and screws necessary for wall/panel mounting. Proceed as follows: Install the mounting plate on a wall or panel as follows: 1. Lay out the required points on the wall/panel as shown in the drilling dimension drawing. A Inches (Millimeters) 1.4 (35) 1.4 (35) 2.3 (59) 3.7 (94) 0.9 (23) .
2–4 Installing Your Remote I/O Adapter Module 1.4 (35.5) 1 - Adapter Mounting Plate 2 - Remote I/O Adapter Module Mounting Screws(18) 2 for the mounting plate and 2 each for the 8 possible modules 4. Hold the adapter (2) at an angle and engage the top of the mounting plate in the indention on the rear of the adapter module. 5. Press the module down flush with the panel until the locking lever locks. 6.
Installing Your Remote I/O Adapter Module Wiring 2–5 Connect external wiring to the remote I/O adapter as shown below. Allen Bradley ADAPTER ACTIVE FAULT 24 VDC POWER SUPPLY RIO ADAPTER 1794-ASB LOCAL FAULT B C COM A 1 D 24V 20131 SH 2 1. Connect the remote I/O cable to the removable plug-in remote I/O connector. Connect To Blue Wire - RIO 1 Shield Wire - RIO SH Clear Wire - RIO 2 2. Connect +24V dc input to the left side of the lower connector terminal A. 3.
2–6 Installing Your Remote I/O Adapter Module Setting the Switches The remote I/O adapter module has two 8-position switch assemblies which you set for: • • • • • • • • starting I/O group I/O rack number hold inputs last chassis reply delay (always on) communication rate processor restart lockout (PRL) hold last state (outputs) Starting I/O Group The starting I/O group is the first group of input and output circuits that correspond to one word in both the input and output image tables.
Installing Your Remote I/O Adapter Module 2–7 Communication Rate You set these switches (S2-3 and S2-4) for the desired communication rate (in bits/s). Selections are: 57.6k bits/s 115.2k bits/s 230.4k bits/s Processor Restart Lockout Reset Pushbutton When PRL is disabled (switch S2-2 on), the programmable controller can restart communication with the adapter in the event of a communication fault.
2–8 Installing Your Remote I/O Adapter Module S1-7 Module group ON ON 0 (1st quarter) OFF ON 2 (2nd quarter) ON OFF 4 (3rd quarter) OFF OFF 6 (4th quarter) 1 2 3 4 5 6 7 8 S1-8 Starting I/O Group I/O Rack Number I/O Rack Number 1 2 3 4 5 6 7 8 Starting I/O Group ON ON S1 S1-6 thru S1-1 S2 Flip open cover Refer to page 2-9 S2-8 S2-7 Hold Inputs ON Hold Inputs OFF Reset Inputs S2-6 Last Chassis1 ON Not last OFF Last S2-5 Reply Delay ON Reserved ON Communication Rate
Installing Your Remote I/O Adapter Module Rack Number 2–9 S1 Switch Position 1747 SN 1771 SN PLC 2 PLC 5 PLC 5/250 PLC 3 6 5 4 3 2 1 Rack 0 Rack 1 Rack 1 Not Valid Rack 0 Rack 1 Rack 2 Rack 2 Rack 1 Rack 1 Rack 0 ON ON ON ON ON ON Rack 1 OFF ON ON ON ON ON Rack 2 Rack 3 Rack 3 Rack 2 Rack 2 Rack 3 Rack 4 Rack 4 Rack 3 Rack 3 Rack 2 ON OFF ON ON ON ON Rack 3 OFF OFF ON ON ON ON Rack 5 Rack 5 Rack 4 Rack 4 Rack 4 ON ON OFF ON ON ON Rac
2–10 Installing Your Remote I/O Adapter Module Publication 1794 6.5.
Chapter 3 Communicating with FLEX I/O Modules Chapter Objectives In this chapter, we tell you about: • addressing your I/O • what combination of I/O modules and I/O chassis you can use • I/O image table usage Hardware Addressing Programmable controllers that use the remote I/O adapter module address their I/O in I/O groups. For each FLEX I/O chassis in your system, the remote I/O adapter must define how many I/O groups exist (1 word each in the input image table and output image table).
3–2 Communicating with FLEX I/O Modules I/O racks are made up of I/O groups. An I/O rack is an addressing unit that can contain up to eight I/O groups. You can use as many as 8 modules per adapter. This provides a maximum of 128 discrete I/O or 64 analog inputs, or 32 analog output channels. Figure 1 An I/O Rack Up to Eight I/O Groups Any combination of discrete digital or analog modules.
Communicating with FLEX I/O Modules 3–3 Some examples of rack definition are shown below. Example 1 - 4 Terminal Bases, 4 Modules Adapter Module Module Module Module = 1/2 Rack Each module is equal to 1 I/O group. Therefore, there are 4 I/O groups to be created. Four I/O groups equal 1/2 of a logical rack.
3–4 Communicating with FLEX I/O Modules Mapping Data into the Image Tables After the rack size has been determined by the remote I/O adapter, the data from the modules must be mapped into the data tables. Mapping of data into the data table is different for discrete digital and analog modules. Data transfer to and from the remote I/O adapter and discrete digital modules occurs every flexbus scan. This data is mapped into the input/output image table.
Communicating with FLEX I/O Modules To see mapping for: Refer to: 16 Input Discrete Module (1794 IB16 page 3-5 16 Output Discrete Module (1794 OB16) page 3-6 8 Input Discrete Module (1794 IB8S) page 3-6 10 Input/6 Output Discrete Combo Module (1794 IB10XOB6) page 3-7 8 Input Discrete Module (1794 IA8) page 3-8 8 Output Discrete Module (1794 OA8) page 3-9 8 Relay Output Discrete Module (1794 OW8) page 3-9 3–5 16 point Discrete Input Module Image Table Mapping - 1794 IB16 Remote I/O Image In
3–6 Communicating with FLEX I/O Modules 16 point Discrete Output Module Image Table Mapping 1794 OB16 Remote I/O Image Input Image Example Address Module Image Word n Not used I:011 Outputs O:011 Output Image Word n Memory Map of 16-Point Discrete Output Module Image Table – 1794-OB16 Decimal Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 (Octal Bits) 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 O6 O5 O4 O3 O2 O1 O0 Input word Not used Output wo
Communicating with FLEX I/O Modules 3–7 Input Delay Times for the 1794-IB8S Input Module Bits Description Selected Delay Time 02 01 00 Delay Time for Inputs 00-11 (00-13) 05 04 03 Delay Time for Inputs 12-15 (14-17) 0 0 0 Delay Time 0 (default) 0 0 1 Delay Time 1 1ms 0 1 0 Delay Time 2 2ms 0 1 1 Delay Time 3 4ms 1 0 0 Delay Time 4 8ms 1 0 1 Delay Time 5 16ms 1 1 0 Delay Time 6 32ms 1 1 1 Delay Time 7 64ms 512µs 16 point Discrete Input/Output Module Image T
3–8 Communicating with FLEX I/O Modules 8 point Discrete Input Module Image Table Mapping - 1794 IA8 Remote I/O Image Input Image Example Address Module Image Word n Not used Inputs I:013 Output Image Delay Time Not used Word n O:013 Memory Map of 8-point Discrete Input Module Image Table – 1794-IA8 Decimal Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 (Octal Bits) 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 D7 D6 D5 D4 D3 D2 D1 D0 Input word
Communicating with FLEX I/O Modules 3–9 8 point Discrete Output Module Image Table Mapping - 1794 OA8 Remote I/O Image Module Image Input Image Example Address Not used Word n I:014 Output Image Word n O:014 Outputs Not used Memory Map of 8-Point Discrete Output Module Image Table – 1794-OA8 Decimal Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 (Octal Bits) 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 O6 O5 O4 O3 O2 O1 O0 Input word Not used
3–10 Communicating with FLEX I/O Modules Analog I/O Modules At powerup, the adapter identifies the type of module installed in the base unit. If the module is an analog module, the adapter will access 15 words of data. ! ! ! Publication 1794 6.5.3 - May 1996 ATTENTION: If using Series A modules, do not use configure select and full range bit settings of 0. Individual channels revert to 4–20mA with bit selections of all zeroes. This could result in unwanted or incorrect action.
Communicating with FLEX I/O Modules 3–11 8 Input Analog Module (Cat. No. 1794 IE8 Series B) Module Image Input Data Channel 0 Input Data Channel 1 I/O Image Input Data Channel 2 Input Size Input Data Channel 3 Input Data Channel 4 1 to 9 Words Read Input Data Channel 5 Input Data Channel 6 Input Data Channel 7 Underrange PU Output Size Configure select 0 or 1 Word Write Analog Input Module (1794-IE8/B) Read Word/Dec.
3–12 Communicating with FLEX I/O Modules Range Selection Bits for the 1794-IE8/B Analog Input Module Channel No.
Communicating with FLEX I/O Modules 3–13 Analog Output Module (1794-OE4/B) Write Configuration Block Word/Dec.
3–14 Communicating with FLEX I/O Modules 4 Input/2 Output Analog Combo Module (Cat. No. 1794 IE4XOE2 Series B) Module Image I/O Image Input Data Channel 0 Input Size Read Input Data Channel 1 0 to 5 Words Input Data Channel 2 Input Data Channel 3 Underrange & Diag.
Communicating with FLEX I/O Modules 3–15 Word/Dec. Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Word/Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Word 7 S Where: Safe State Value - Output Channel 1 S = Sign bit (in 2's complement) M = Multiplex control C = Configure select bit F = Full range bit Range Selection Bits for the 1794-IE4XOE2/B Analog Combo Module Channel No.
3–16 Communicating with FLEX I/O Modules RTD Input Module (1794 IR8) Image Table Mapping Module Image Reserved Input Data Channel 0 Input Data Channel 1 I/O Image Input Data Channel 2 Input Size Input Data Channel 3 1 to 11 Words Read Input Data Channel 4 Input Data Channel 5 Input Data Channel 6 Input Data Channel 7 Overrange Calibration Status Output Size Configuration Calibration Mask 0 to 3 Words Write Underrange RTD Type RTD Type RTD Analog Input Module (1794-IR8) Read Words Decimal Bi
Communicating with FLEX I/O Modules 3–17 RTD Analog Input Module (1794-IR8) Write Words Decimal Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Cal Clk Cal Hi Cal Lo Write Word 0 8 bit Calibration Mask 1 2 Where: Filter Cutoff Enh MDT RTD 3 Type RTD 2 Type RTD 1 Type RTD 0 Type RTD 7 Type RTD 6 Type RTD 5 Type RTD 4 Type Enh = Enhanced MDT = Module Data Type Thermocouple/mV Input Module (1794 I
3–18 Communicating with FLEX I/O Modules Decimal Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Bad Structure CJC over CJC Under 9 Overrange Bits 10 0 0 0 0 0 Underrange Bits Bad Cal Cal Cal Done Range 0 Diagnostic Status Pwr Up Thermocouple/mV Input Module (1794-IT8) Write Dec.
Chapter 4 Troubleshooting Chapter Objectives In this chapter, we tell you: • about the indicators on the module front plate • how to use the indicators for troubleshooting the module Fault Conditions Two conditions can cause the remote I/O adapter to declare a link (remote I/O) fault: • no link activity for more than 100ms • no commands issued to this address within the last 255 link transactions When either of these conditions exist, the adapter will: • reset all outputs or leave them in their last
4–2 Troubleshooting Table 4.A Remote I/O System Troubleshooting Guide Allen Bradley Local Fault Adapter Fault Adapter Active ADAPTER ACTIVE FAULT 24 VDC POWER SUPPLY RIO ADAPTER 1794-ASB LOCAL FAULT Communication States and Module Display Local Fault Adapter Fault Adapter Active Off Off On Off Off Blinking Off Off Off Off Blinking alternately Operating State Actions Fault Reset Normal Communications Outputs enabled.
Troubleshooting 4–3 Additional Faults and Module Displays Local Fault Off Adapter Fault On Adapter Active Off Chapter Summary Fault Condition Actions Random Access Memory fault. Reset outputs. Stop communicating on remote I/O link. Read Only Memory fault (on powerup only). Outputs remain reset. Communication never starts. Internal watchdog timer timed out. Try to reset outputs. Stops communicating on the remote I/O link. Fault Reset Cycle power. (This may not correct fault.
Appendix A Specifications 1794 ASB Remote I/O Adapter I/O Capacity 8 modules Input Voltage Rating 24V dc nominal Input Voltage Range 19.2V to 31.2V dc (includes 5% ac ripple) Communication Rate 57.6k bps 115.2k bps 230.4k bps Indicators Adapter Active - green Adapter fault - red Local fault - red Flexbus Output Current 640mA maximum Isolation Voltage 100% tested at 850V dc for 1s between user power and flexbus Power Consumption 450mA maximum from external 24V supply Power Dissipation 4.
Index Symbols diagnostic indicators, **Empty**, P-2, 1-4, 2-10, 3-1, 3-2, 3-4, 3-16, 4-4, 4-1 A adapter switch settings, 2-6 addressing, I/O groups, 3-2 audience, P-1 B image table memory map 1794 IB16, 3-5 1794 IA8, 3-8 1794 IB10XOB6, 3-7 1794 IB8S, 3-6 1794 OA8, 3-9 1794 OB16, 3-6 1794 OW8, 3-9 4-1 input delay 1794 IA8, 3-8 1794 IB16, 3-5 1794 IB8S, 3-7 block transfer read 1794 IE4XOE2, 3-14 1794 IE8, 3-11 1794 IR8, 3-16 1794 IT8, 3-17 1794 OE4, 3-12 M block transfer write 1794 IE4XOE2, 3-14
I–2 Index remote I/O cable, connecting the wiring, 2-5 RTD analog input mapping, 1794 IR, 3-16 2-6 T thermocouple input mapping, 1794 IT8, 3-17 S safe state values, 3-18 specifications, switch settings, A-1 troubleshooting guide, 4-2 troubleshooting indicators, 4-1
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Remote I/O Adapter User Manual Pub. Name Cat. No. 1794 ASB/B Check Problem(s) Type: Pub. No. 1794 6.5.3 Pub. Date May 1996 Part No.
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