Owner’s Guide 0300191-04 Rev.
Important Notes 1. Please read all the information in this owner’s guide before installing the product. 2. The information in this owner's guide applies to hardware version A and firmware version 2.0 or later. 3. This guide assumes that the reader has a full working knowledge of the relevant processor. Notice The products and services described in this owner's guide are useful in a wide variety of applications.
Preface Read this preface to familiarize yourself with the rest of the owner’s guide. This preface covers: • who should use this guide • what this guide covers • related Allen-Bradley documents • terms & abbreviations you should know Who Should Use This Guide Use this guide if you design, install, program, or maintain a control system that uses Allen-Bradley ControlLogix Controllers. You should have a basic understanding of ControlLogix products.
vi ControlLogix™ Universal Analog Input Modules 1756 Series ControlLogix Module Installation Instructions (Each module has separate document for installation) 1756-L1, Logix5550 Controller User Manual -L1M1, -L1M2 1756-DHRIO ControlLogix Data Highway Plus Communication Interface Module User Manual 1756-5.5, -5.42 1756-6.5.12 1756-6.5.2 1756-ENET ControlLogix Ethernet Communication Interface Module User Manual 1756-6.5.
Preface vii Cut-off frequency - The frequency at which the input signal is attenuated 3 dB by the digital filter. Frequency components of the input signal that are below the cut-off frequency are passed with under 3 dB of attenuation for low-pass filters. dB (decibel) – A logarithmic measure of the ratio of two signal levels. Digital filter - A low-pass mathmatic single order filter applied to the A/D signal. The digital filter provides high-frequency noise rejection.
viii ControlLogix™ Universal Analog Input Modules Step response time – The time required for the A/D signal to reach 95% of its expected, final value, given a full-scale step change in the output data word. Tags - Identifiers for configuration, data, and status information found withing the module. Tags allow the user to modify specific module attributes and view data and status.
Table of Contents Preface v Module Overview 1 Installing And Wiring Your Module 9 Operation Within the ControlLogix System 23 Programming Your Module 29 Who Should Use This Guide ................................................................................... v What This Guide Covers .......................................................................................... v Related Allen-Bradley Documents ........................................................................... v Table A.
x ControlLogix™ Universal Analog Input Modules Configuration, Data, and Status Tags 37 Programming Examples 55 Troubleshooting 61 Maintaining Your Module And Ensuring Safety 65 Module Specifications 69 Thermocouple Descriptions 75 Send Configuration Data to the Module ................................................................ 37 Configuration Tags ................................................................................................. 38 Global Module Settings ..........................
Table of Contents Using Grounded Junction, Ungrounded Junction, and Exposed Junction Thermocouples 97 Programming Your Module 101 xi Thermocouple Types .............................................................................................. 97 Grounded Junction ................................................................................................. 98 Ungrounded (Insulated) Junction .......................................................................... 98 Exposed Junction ............
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Chapter 1 Module Overview This chapter describes the universal analog input module and explains how the ControlLogix controller reads analog input data from the module. Read this chapter to familiarize yourself further with your universal analog input module. This chapter covers: • general description and hardware features • an overview of system and module operation General Description This module is designed exclusively for use in the Allen-Bradley ControlLogix 1756 I/O rack systems.
2 ControlLogix™ Counter Module Detailed Specifications Input Ranges The following tables provide compatibility information on the supported thermocouple types and their associated temperature ranges, the supported RTD types and their associated temperature ranges, as well as the millivolt, volt, milliamp and resistance input types supported by the IF8u module. To determine the practical temperature range of your thermocouple, refer to the specifications in appendices A and B. Table 1.
Chapter 1: Module Overview 3 Table 1.3 Millivolt Input Ranges Stated Actual -50 to +50 mV (-75 to +75 mV) -150 to +150 mV (-175 to +175 mV) 0 to +5.0 V (-0.5 to +5.5 V) 1.0 to +5.0 V (0.5 to +5.5 V) 0 to 10.0 V (-0.5 to 10.0 V) -10.0 to +10.0 V (-10.0 to +10.0 V) Table 1.4 Current Input Ranges 4 to 20 mA (-3.5 to +21.5mA) 0 to 20 mA (0 to +21.5mA) Table 1.
4 ControlLogix™ Counter Module Table 1.6 Hardware Features Hardware Function OK LED Displays communication and fault status of the module Cal LED Displays a fault condition Side Label (Nameplate) Provides module information Removable Terminal Block Provides electrical connection to input devices Door Label Permits easy terminal identification Self Locking Tabs Secure module in chassis slot Terminal Block Switch Locks the RTB to the module.
Chapter 1: Module Overview 5 Table 1.6 Hardware Features Hardware Function OK LED Displays communication and fault status of the module Cal LED Displays a fault condition Side Label (Nameplate) Provides module information Removable Terminal Block Provides electrical connection to input devices Door Label Permits easy terminal identification Self Locking Tabs Secure module in chassis slot Terminal Block Switch Locks the RTB to the module.
6 ControlLogix™ Counter Module Compatibility with Thermocouple, Current, and Millivolt Devices & Cables The module is compatible with the following standard types of thermocouples: B, E, J, K, N, R, S, T and C and extension wire. Refer to appendices B and C for details. The module is also compatible with a variety of voltage and current devices with an output of ±50, ±150 mV, 05V, 1-5V, 0-10V, ±10V, 0-20mA, and 4-20mA.
Chapter 1: Module Overview Table 1.8 Cable Specifications Description For Belden #9501 Belden#9533 Belden#83503 2-wire RTDs and 3-wire RTDs and 3-wire RTDs and potentiometers. potentiometers. Short potentiometers.
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Chapter 2 Installing And Wiring Your Module Read this chapter to install and wire your module. This chapter covers: • avoiding electrostatic damage • determining power requirements • installing the module • wiring signal cables to the module’s terminal block Electrostatic Damage Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins.
10 ControlLogix™ Universal Analog Input Module Power Requirements The module receives its power through the ControlLogix chassis backplane from the fixed or modular +5 VDC and +24 VDC chassis power supply. The maximum current drawn by the module is shown in the table below. Table 2.1. Maximum current drawn by the module 5VDC Amps 0.230 24VDC Amps 0.075 Using your module in the ControlLogix System Place your module in any slot of a ControlLogix modular, or modular expansion chassis.
Chapter 2: Installing And Wiring Your Module 11 Preventing Electrostatic Discharge This module is sensitive to electrostatic discharge. ! ATTENTION: Electrostatic discharge can damage integrated circuits or semiconductors if you touch backplane connector pins.
12 ControlLogix™ Universal Analog Input Module EN 61010-1 and EN 61131-2, EN61000-6-2:2001, EN61000-6-4:2001 EN61010-1:2001 This product is intended for use in an industrial environment. 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.
Chapter 2: Installing And Wiring Your Module 13 To insert your module into the rack, follow these steps: 1. Align the circuit board of your module with the card guides at the top and bottom of the chassis. Figure 2.1. Module insertion into a rack 2. Key the RTB in positions that correspond to unkeyed module positions. Insert the wedge-shaped tab on the RTB with the rounded edge first. Push the tab onto the RTB until it stops.
14 ControlLogix™ Universal Analog Input Module Figure 2.2. Wiring Your Module Terminal block diagram with keying Follow these guidelines to wire your input signal cables: • Power, input, and output (I/O) wiring must be in accordance with Class I, Division 2 wiring methods [Article 501-4(b) of the National Electrical Code, NFPA 70] and in accordance with the authority having jurisdiction. • Peripheral equipment must be suitable for the location in which it is used.
15 Chapter 2: Installing And Wiring Your Module • Keep all unshielded wires as short as possible. • To limit overall cable impedance, keep input cables as short as possible. Locate your I/O chassis as near the RTD or thermocouple sensors as your application will permit. • Tighten screw terminals with care. Excessive tightening can strip a screw. The RTB terminations can accommodate 2.1…0.25 mm2 (14…22 AWG) shielded wire and a torque of 0.5 N•m (4.4 lb•in.).
16 ControlLogix™ Universal Analog Input Module - connect to mV devices keeping the leads short Important: If noise persists, try grounding the opposite end of the cable, instead (Ground one end only.) Terminal Block Layout The following figure shows the general terminal block layout. The input signal type will determine which pins are used.
Chapter 2: Installing And Wiring Your Module Wiring Voltage/ Current Inputs the IF8u Module 17 Voltage inputs use the terminal block pins labelled IN+ and INCurrent inputs use the terminal block pins labelled IN+ and INVoltage Inputs EXC+ IN+ Voltage + Voltage - INiRTN CABLE SHIELD Current Inputs ADD JUMPER EXC+ IN+ Current + INiRTN Current CABLE SHIELD
18 ControlLogix™ Universal Analog Input Module Wiring RTD or Resistance Sensors to the IF8u Module The IF8u module supports two, three, and four wire RTDs or resistance inputs connected individually to the module as shown in the figure below.
Chapter 2: Installing And Wiring Your Module RTD Type Current Source V/°C 100Ω Pt 385 200Ω Pt 385 500Ω Pt 385 1000Ω Pt 385 1.008mA 1.008mA 252µA 252µA 357µV/°C 714µV/°C 447µV/°C 893µV/°C 100Ω Pt 3916 200Ω Pt 3916 500Ω Pt 3916 1000Ω Pt 3916 1.008mA 1.008mA 252µA 252µA 377µV/°C 754µV/°C 472µV/°C 941µV/°C 120Ω Ni 618 200Ω Ni 618 500Ω Ni 618 1000Ω Ni 618 1.008mA 1.008mA 252µA 252µA 694µV/°C 1389µV/°C 867µV/°C 1733µV/°C 10Ω Cu 426 252µA 9.7µV/°C 120Ω Ni 672 1.
Wiring Thermocouples to the IF8u Module One end of thermocouple to IN+ Other end of thermocouple to INThermocouple Inputs EXC+ IN+ TC + TC - INiRTN CABLE SHIELD CJC Sensors CJC+ CJC- White (With Potted Sensor) White (No Sensor) For cold junction compensation be sure the two supplied thermistors are connected. One should be connected between CJC0-IN+ and CJC0-INand the other should be connected between CJC1-IN+ and CJC1-IN-. Also be sure configuration tag “.
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Chapter 3: Operation within the System 23 Operation Within the ControlLogix System This chapter describes how the 1756sc-IF8u analog module works within the ControlLogix system. This chapter covers: • Ownership and connections to the module • Direct connections • Listen only mode • Configuration changes with multiple owners. Ownership and Connections Every I/O module in the ControlLogix system must be owned by a Logix5550 Controller to be useful.
24 ControlLogix™ Universal Analog Input Module 2. If the I/O configuration data references a module in a remote chassis, run RSNetWorx. Important: RSNetWorx must be run whenever a new module is added to a networked chassis. When a module is permanently removed from a remote chassis, we recommend that RSNetWorx be run to optimize the allocation of network bandwidth.
Chapter 3: Operation within the System 25 This configurable parameter instructs the module to perform the following operations: 1. scan all of its input channels and store the data into on-board memory 2. multicast the updated channel data (as well as other status data) to the backplane of the local chassis Requested Packet Interval (RPI) This configurable parameter also instructs the module to multicast its channel and status data to the local chassis backplane.
26 ControlLogix™ Universal Analog Input Module The “reserved” spot on the network and the module’s RTS are asynchronous to each other. This means there are Best and Worst Case scenarios as to when the owner controller will receive updated channel data from the module in a networked chassis. Best Case RTS Scenario In the Best Case scenario, the module performs an RTS multicast with updated channel data just before the “reserved” network slot is made available.
Chapter 3: Operation within the System 27 When the controllers begin downloading configuration data, both try to establish a connection with the input module. Whichever controller’s data arrives first establishes a connection. When the second controller’s data arrives, the module compares it to its current configuration data (the data received and accepted from the first controller).
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Chapter 4 Programming Your Module This chapter explains how to program your module in the ControlLogix system. It also describes how the module’s input configuration are incorporated into your ladder logic program. Topics discussed include: • importing the module’s configuration profile • reviewing accessing and altering configuration options.
30 ControlLogix™ Universal Analog Input Module 1. Open the sample project with the IF8u information. Open your project. Drag and drop the IF8u module into the I/O configuration section of your project. 1. Open the sample project. 2. Open your new project. 3. Click once on the IF8u in the sample project. 4. Drag and drop it into the I/O Configuration section of your project. See Appendix D for the I/O module property details.
Chapter 4: Programming Your Module 31 2. Drag and drop the IF8u user-defined data types from the sample project into your project. There are four IF8u user defined data types that need to be moved. ChannelConfig ChannelStatus IF8u_Config_Template IF8u_Input_Template 1. Click on the data type 2. Drag it into your new project. 3. Continue to drag and drop the data types until all four have been moved. Note: These can only be moved one at a time.
32 ControlLogix™ Universal Analog Input Module 3. Drag and drop the controller configuration tags from the sample project into your project. 1. Right click on the Controller Tags item of the sample project and select edit. 2. Right click on the Controller Tags item of your project and select edit. 3. Scroll down to the Controller tags of the sample project and select all the tags by highlighting them. 4. Drag and drop these tags into your project.
Chapter 4: Programming Your Module 33 4. Create a new ladder logic routine in your project. 1. In your project, right mouse click on the MainRoutine item and select “New Routine...” IF8u was entered in the example above. 2. Double click on the MainRoutine item in the sample project and then double click on the added new routine in your project to display their corresponding ladder logic. 3. Left mouse inside the MainProgram ladder logic in the sample project and press crtl-A to select all the rungs. 4.
34 ControlLogix™ Universal Analog Input Module Configuring module attributes: Configuration Tags The module has settings that are global and channel specific. These are accessed via the controller tags. Specific information regarding these tag settings may be found in Chapter 5. Global module tags These settings are used globally by the module. They control features such as the module autocalibration modes, and various other attributes.
Chapter 4: Programming Your Module 35 Channel Specific Tags These settings control channel specific behavior such as input type, range, filter frequency, units, and alarms. Specific information regarding these tags may be found in Chapter 5. Data Tags These tags represent the process data values in their final form.
36 ControlLogix™ Universal Analog Input Module Status Tags These tags report module status such as alarm conditions, faults, and errors.
Chapter 37 5 Chapter 5: Channel Configuration, Data, and Status Choosing a Wiring Method The 1756-IF16 and 1756-IF8 modules support the following three wiring Configuration, Data, and Status Tags Read this chapter to: • send configuration data to the module • configure global module properties • configure each input channel • check each input channel’s data • check module and individual channel status This chapter outlines the detailed settings for the 1756sc-IF8u.
38 ControlLogix™ Universal Analog Input Module Note: If an invalid configuration is sent to the module a connection error will occur. See chapter 7 for a list of error codes. Configuration Tags Global Module Settings The following Global Module Settings and Channel Specific Settings sections allow custom configuration of the module. These tags can be found within the IF8u_config controller tag. The following tag settings are module related: Configuration Management .
Chapter 5: Channel Configuration, Data, and Status 39 1: Temperatures for thermocouples, RTDs and the cold junction thermistors will be displayed in degrees Fahrenheit. -25 to +65 degC -45 to + 117 degF .CJOffset REAL A temperature offset added to the cold junction compensation temperature values. This is interpreted as degrees C if the .TempMode = 0 and degrees F if the .TempMode = 1.
40 ControlLogix™ Universal Analog Input Module Input Type: Each input type has a specific settling time. Select each channel input type and add the time value. Time (ms) 0 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 8 8 8 8 8 Type All voltage, current, and thermocouple types 100_Pt_385 100_Pt_392 120_Ni_618 120_Ni_672 10_Cu_426 604_NiFe_518 0_250_Ohm 0_500_Ohm 200_Pt_385 500_Pt_385 200_Pt_392 500_Pt_392 200_Ni_618 500_Ni_618 0_1000_Ohm 0_2000_Ohm 1000_Pt_385 1000_Pt_392 1000_Ni_618 0_3000_Ohm 0_4000_Ohm Tag: .
Chapter 5: Channel Configuration, Data, and Status .RealTimeSample 10-30,000 ms 41 INT The time in milliseconds that updated input data is to be sent from the module to the controller. If this value is smaller than the minimum update time to scan all input channels, then the actual rate will be greater than this value. In this case you may determine what the actual sample time is by subtracting two successive values of the .RollingTimeStamp input tag.
42 ControlLogix™ Universal Analog Input Module Automatic Calibration: Autocalibration is an automated input path calibration. This insures best possible accuracy under varying application conditions. Autocalibration may be turned on or off. When autocalibration is active you may also set the interval at which the calibration occurs. .DisableCyclicAutocal 0, 1 BOOL 0: Module auto-calibration is performed on power up, reset, and reconfiguration as well as according to the .CyclicAutocalPeriod.
Chapter 5: Channel Configuration, Data, and Status Channel Specific Settings 43 The following settings allow you to configure individual channel parameters. Each channel, 0 through 7, has these tags. Channel On/Off: .DisableChannel 0, 1 BOOL 0: Channel is enabled. 1: Channel is disabled. You may decrease the module sampling time by disabling unused channels. Input Range/Type .RangeType 0-37 INT You can select from a series of operational ranges for each channel on your module.
44 ControlLogix™ Universal Analog Input Module Temperature Measurement: .RTD3Wire 0, 1 BOOL 0 = Two wire RTD or resistor if RTD or resistor input type for this channel is selected. 1 = Three or four wire RTD or resistor if RTD or resistor input type for this channel is selected. .DisableCyclicLead 0, 1 BOOL 0 = If 3 or 4 wire RTDs or resistors are selected then the lead resistances are also read and compensated for.
Chapter 5: Channel Configuration, Data, and Status 45 Rate Alarm The rate alarm triggers if the rate of change between input samples for each channel exceeds the specified trigger point for that channel. It is based on the channels .RangeType native units per second. (V, mA, degC (.TempMode = 0), degF (.TempMode = 1), Ohms.) For example, if you set the a channel, with a voltage range type, to a rate alarm of 1.
46 ControlLogix™ Universal Analog Input Module .LAlarmLimit REAL A low alarm will activate if the value of the scaled input is at or below this value. It will clear, if not latched, if it is above this level plus the .AlarmDeadband amount. .HAlarmLimit REAL A high alarm will activate if the value of the scaled input is at or above this value. It will clear, if not latched, if it is below this level plus the .AlarmDeadband amount. .
Chapter 5: Channel Configuration, Data, and Status Current: Engineering Units value: 3mA 4mA 12mA 20mA 21mA -6.25% 0% 50% 100% 106.25% 47 Important: In choosing two points for the low and high signal value of your channel, you do not limit the range of the module. .LowSignal REAL When the input is this value it will scale the input to the .LowEngineering value. .HighSignal REAL When the input is this value it will scale the input to the .HighEngineering value. .
48 ControlLogix™ Universal Analog Input Module The module filter is a built-in feature of the Analog-to-Digital convertor which attenuates the input signal beginning at the specified frequency. This feature is used on a individual channel basis. In addition to frequency rejection, a by-product of the filter selection is the minimum sample rate (RTS) that is available.
Chapter 5: Channel Configuration, Data, and Status .DigitalFilter 0- 32767 ms 49 INT The time constant for a digital first order lag filter applied to the input data for smoothing noise transients. 0 = no digital filter. 100 = data will achieve 63.2% of its value in 100ms.
50 ControlLogix™ Universal Analog Input Module Input Tags Fault and Status Reporting Tags The following fault and status reporting and module data sections allow monitoring of faults, status, and input data from the module. These tags can be found withing the IF8U_Input controller tag. The 1756-IF8u module multicasts status/fault data to the owner/listening controller with its channel data.
Chapter 5: Channel Configuration, Data, and Status 51 .ModuleFaults Below are a collection of all module level fault bits. Bits are defined as follows: 0 - 7 are unused 8 - CJOverrange 9 - CJUnderrange 10 - unused 11 - CalFault, set if IF8U_Input.ChannelStatus[x].CalFault bit is set 12 - unused 13 - unused 14 - InGroupFault 15 - AnalogGroupFault Any bit set in the ChannelFaults word sets both the InGroupFault and AnalogGroupFault bits. .
52 ControlLogix™ Universal Analog Input Module Channel related status tags: The following channel related tags are preceded by the tag name IF8U_Input.ChannelStatus[X] where X is the channel number 0-7 .Underrange Indicates the channel’s input is equal to or less than the minimum value for the selected range or open wire. Note: The (-10 to +10vdc) input type does not support this function. .Overrange Indicates the channel’s input is equal to or above the maximum value for the selected range.
Chapter 5: Channel Configuration, Data, and Status 53 .HHAlarm High high alarm bit which is set when the input signal moves above the configured high high alarm trigger point(HHAlarmLimit). Remains set until the input signal moves below the trigger point, unless latched via ProccessAlarmLatch or the input is still within the configured alarm deadband of the high high alarm trigger point. .Status Below are a collection of individual channel status bits.
54 ControlLogix™ Universal Analog Input Module .Ch6Data REAL The channel 6 input signal represented in engineering units. The input signal is measured and then scaled based on the user configuration. .Ch7Data REAL The channel 7 input signal represented in engineering units. The input signal is measured and then scaled based on the user configuration. .CJ0Data REAL The cold junction sensor temperature of CJC0 in degrees Celsius or Fahrenheit. .
Chapter 55 6 Chapter 6: Ladder Program Examples Programming Examples Earlier chapters explained how the tag configuration defines the way the module operates. This chapter shows some basic programming which controls the operation of the module. It also provides you with segments of ladder logic specific to unique situations that might apply to your programming requirements. Initial Programming Figure 5.
56 ControlLogix™ Universal Analog Input Module Figure 5.1 Sample Ladder Logic Rung 0 - This rung copies the configuration data (IF8u_Config) into the module’s configuration image memory. This rung is required. Rung 1 - This rung copies the input data received from the module’s input memory into the IF8u_Input tag for monitoring and ladder usaged. this rung is required. Rung 2 - This is an optional example rung indicating how to reset the module via ladder logic.
Chapter 6: Ladder Program Examples Rung 3 - This is an optional example rung indicating how to send on-thefly configuration data to the module. This is useful if you would like to change channel alarm or scaling tags without causing interuption in channel updates. Changing other tags will cause a 2.5 second delay in channel updates but the connection will not be interupted. Continued on next page...
58 ControlLogix™ Universal Analog Input Module You may use either the SetAttributeAll or the Module Reconfigure message.
Chapter 6: Ladder Program Examples Rung 4: This rung describes how to unlatch process alarms.
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Chapter 7 Troubleshooting Using Module Indicators to Troubleshoot The universal analog I/O module has indicators which provide indication of module status.
62 ControlLogix™ Universal Analog Input Module The following LED display is used with ControlLogix analog input modules: Using RSLogix 5000 to Troubleshoot Your Module In addition to the LED display on the module, RSLogix 5000 will alert you to fault conditions.
Chapter 7: Testing Your Module Fault information on the properties screen. Determining Fault Type When you are monitoring a module’s properties dialog in RSLogix 5000 and receive a fault message, the module fault area lists the type of fault.
64 ControlLogix™ Universal Analog Input Module Module Configuration Errors The “Additional Fault Code” value details the configuration error if the “(16#0009) module configuration rejected: Parameter Error” was received. Global Errors 16#0F04 - .ConfigurationRevError If the .ConfigurationRevNumber tag is 1 and a second owner attempts to connect with a different configuration, this error will occur. You must adjust the second owners configuration to match the first. 16#0F05 - .
Chapter 65 8 Chapter 8: Maintaining Your Module And Ensuring Safety Maintaining Your Module And Ensuring Safety Read this chapter to familiarize yourself with: • preventive maintenance • safety considerations The National Fire Protection Association (NFPA) recommends maintenance procedures for electrical equipment. Refer to article 70B of the NFPA for general safety-related work practices.
66 ControlLogix™ Universal Analog Input Module Standing Clear Of Machinery – When troubleshooting a problem with any ControlLogix system, have all personnel remain clear of machinery. The problem may be intermittent, and the machine may move unexpectedly. Have someone ready to operate an emergency stop switch. ! CAUTION POSSIBLE EQUIPMENT OPERATION Never reach into a machine to actuate a switch.
Chapter 8: Maintaining Your Module And Ensuring Safety 67 WARNING ! EXPLOSION HAZARD WHEN IN HAZARDOUS LOCATIONS, TURN OFF POWER BEFORE REPLACING OR WIRING MODULES. WARNING ! THIS DEVICE IS INTENDED TO ONLY BE USED WITH THE ALLEN-BRADLEY CONTROLLOGIX 1756 I/O SYSTEM.
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Appendix A Module Specifications This appendix lists the specifications for the 1756sc-IF8u Universal analog Input Module. Electrical Specifications Backplane Current Consumption 230 mA at 5 VDC 75 mA at 24 VDC Backplane Power Consumption 3.00W maximum (0.6W @ 5 VDC, 2.
70 ControlLogix™ Universal Analog Input Module Physical Specifications LED Indicators 1 red/green status indicators, 1 red calibration status Recommended Cable: for thermocouple inputs... for mV, V or mA inputs for RTD inputs Shielded twisted pair thermocouple extension wire Belden 8761 or equivalent shielded Belden #9501, #9533, #83503 Maximum Wire Size One 2.1 mm2 (16AWG) wire or two 0.25 mm2 (22AWG) wires per terminal Refer to the thermocouple manufacturer for the correct extension wire.
71 Appendix A: Module Specifications Thermocouple Type B Thermocouple Type N Thermocouple Type C CJC Sensor 300°C to 1820°C -210°C to 1300°C 0°C to 2315°C 0°C to 90°C (572°F to 3308°F) (-346°F to 2372°F) (32°F to 4199°F) (32°F to 194°F) Millivolt (-50 mVdc to +50 mVdc / -150 mVdc to +150 mVdc) Volt (0-5V, 1-5V, 0-10V, ±10V) Current (4 to 20mA / 0 to 20mA) RTD Pt 385 (100Ω, 200Ω, 500Ω, 1000Ω) RTD Pt 3916 (100Ω, 200Ω, 500Ω, 1000Ω) RTD 10Ω Cu 426 RTD Ni 618 (120Ω, 200Ω, 500Ω, 1000Ω) RTD 120Ω Ni 672 RTD 12
72 ControlLogix™ Universal Analog Input Module RTD Conversion JIS C 1602-1997 for Pt 385 JIS C 1604-1989 for Pt 3916 SAMA RC21-4-1966 for the 10Ω Cu 426 RTD DIN 43760 Sept. 1987 for the 120Ω Ni 618 RTD MINCO Application Aid #18 May 1990 for the 120Ω Ni 672 RTD Thermocouple Linearization NIST ITS-90 standard RTD Current Source 252μA or 1.
Appendix A: Module Specifications 73 resistance imbalance. The hardware and software errors include calibration of the system, and non-linearity of the ADC. For the sake of the calculations the resolution of the ADC was assumed to be at least 16 bits (use of the 10Hz, 50Hz, and 60Hz filter frequencies). Note: The 250Hz frequency should not be applied to thermocouple or RTD inputs if accuracy is a concern.
74 ControlLogix™ Universal Analog Input Module Current Input, 0 to 20mA Current Input, 4 to 20mA 0.05% FS, 0.1% FS 0.05% FS, 0.1% FS 0.1% FS, 0.25% FS 0.1% FS, 0.25% FS Voltage Input, -10 to +10V Voltage Input, 0 to 10V Voltage Input, 0 to 5 V Voltage Input, 1 to 5V Voltage Input, -50m to +50mV Voltage Input, -150m to +150mV 0.025% FS, 0.05% FS 0.025% FS, 0.05% FS 0.025% FS, 0.05% FS 0.025% FS, 0.05% FS 0.05% FS, 0.1% FS 0.05% FS, 0.1% FS 0.05% FS, 0.1% FS 0.05% FS, 0.1% FS 0.05% FS, 0.1% FS 0.
Appendix B Thermocouple Descriptions The following information was extracted from the NIST Monograph 175 issued in January 1990, which supersedes the IPTS-68 Monograph 125 issued in March 1974. NIST Monograph 175 is provided by the United States Department of Commerce, National Institute of Standards and Technology.
76 ControlLogix™ Universal Analog Input Module the thermocouple usage. The total and specific types of impurities that occur in commercial iron change with time, location of primary ores, and methods of smelting. Many unusual lots have been selected in the past, for example spools of industrial iron wire and even scrapped rails from an elevated train line. At present, iron wire that most closely fits these tables has about 0.25 percent manganese and 0.12 percent copper, plus other minor impurities.
Appendix B: Thermocouple Descriptions 77 much as 40uV (or 0.6°C equivalent) per minute when first brought up to temperatures near 900°C. ASTM Standard E230-87 in the 1992 Annual Book of ASTM Standards [7] specifies that the initial calibration tolerances for type J commercial thermocouples be +/-2.2°C or +/-0.75% (whichever is greater) between 0°C and 750°C. Type J thermocouples can also be supplied to meet special tolerances, which are equal to approximately one-half the standard tolerances given above.
78 ControlLogix™ Universal Analog Input Module homogeneity of type KN thermoelements, however, was found [8] to be not quite as good as that of type EN thermoelements. Type K thermocouples are recommended by the ASTM [5] for use at temperatures within the range -250°C to 1260°C in oxidizing or inert atmospheres.
Appendix B: Thermocouple Descriptions 79 (3.25mm) wire. It decreases to 1090°C for AWG 14 (1.63mm), 980°C for AWG 20 (0.81mm), 870 for AWG 24 or 28 (0.51mm or 0.33mm), and 760°C for AWG 30 (0.25mm). These temperature limits apply to thermocouples used in conventional closed-end protecting tubes and they are intended only as a rough guide to the user. They do not apply to thermocouples having compacted mineral oxide insulation.
80 ControlLogix™ Universal Analog Input Module helium temperatures (about 4°K) but that its Seebeck coefficient becomes quite small below 20°K. Its Seebeck coefficient at 20°K is only about 5.6uV/°K, being roughly two-thirds that of the type E thermocouple. The thermoelectric homogeneity of most type TP and type TN (or EN) thermoelements is reasonably good.
Appendix B: Thermocouple Descriptions 81 supplied to meet the tolerances specified for temperatures above 0°C. However, the same materials may not satisfy the tolerances specified for the -200°C to 0°C range. If materials are required to meet the tolerances below 0°C, this should be specified when they are purchased. The suggested upper temperature limit of 370°C given in the ASTM standard [7] for protected type T thermocouples applies to AWG 14 (1.63mm) wire. It decreases to 260°C for AWG 20 (0.
82 ControlLogix™ Universal Analog Input Module stability of EP and EN type alloys when heated in air at elevated temperatures and his work should be consulted for details. More recent stability data on these alloys in air were reported by Burley et al. [13]. Type E thermocouples should not be used at high temperatures in sulfurous, reducing, or alternately reducing and oxidizing atmospheres unless suitably protected with protecting tubes.
Appendix B: Thermocouple Descriptions 83 AWG 20 (0.81mm), 430°C for AWG 24 or 28 (0.51mm or 0.33mm), and 370°C for AWG 30 (0.25mm). These temperature limits apply to thermocouples used in conventional closed-end protecting tubes and they are intended only as a rough guide to the user. They do not apply to thermocouples having compacted mineral oxide insulation.
84 ControlLogix™ Universal Analog Input Module 0°C and 1450°C. Type R thermocouples can be supplied to meet special tolerances of +/-0.6°C or +/-0.1% (whichever is greater). The suggested upper temperature limit, 1480°C, given in the ASTM standard [7] for protected type R thermocouples applies to AWG 24 (0.51mm) wire. This temperature limit applies to thermocouples used in conventional closed-end protecting tubes and it is intended only as a rough guide to the user.
Appendix B: Thermocouple Descriptions 85 short periods of time. However, type B thermocouples are generally more suitable for such applications above 1200°C. Type S thermocouples should not be used in reducing atmospheres, nor in those containing metallic vapor (such as lead or zinc), nonmetallic vapors (such as arsenic, phosphorus, or sulfur) or easily reduced oxides, unless they are suitably protected with nonmetallic protecting tubes.
86 ControlLogix™ Universal Analog Input Module weight percent increase in rhodium content; the Seebeck coefficient increases by about 4% per weight percent increase at the same temperature. ASTM Standard E230-87 in the 1992 Annual Book of ASTM Standards [7] specifies that the initial calibration tolerances for type S commercial thermocouples be +/-1.5°C or +/-0.25% (whichever is greater) between 0°C and 1450°C. Type S thermocouples can be supplied to meet special tolerances of +/-0.6°C or +/-0.
Appendix B: Thermocouple Descriptions 87 oxidizing atmosphere (air) but also has been used successfully in neutral atmospheres or vacuum by Walker et al [25,26], Hendricks and McElroy [41], and Glawe and Szaniszlo [24]. The stability of the thermocouple at high temperatures has been shown by Walker et al. [25,26] to depend, primarily, on the quality of the materials used for protecting and insulating the thermocouple.
88 ControlLogix™ Universal Analog Input Module to 14.4% chromium, 1.3 to 1.6% silicon, plus small amounts (usually not exceeding about 0.1%) of other elements such as magnesium, iron, carbon, and cobalt. The negative thermoelement, NN, is an alloy that typically contains about 95% nickel, 4.2 to 4.6% silicon, 0.5 to 1.5% magnesium, plus minor impurities of iron, cobalt, manganese and carbon totaling about 0.1 to 0.3%.
Appendix B: Thermocouple Descriptions 89 The performance of type N thermocouples fabricated in metal-sheathed, compacted ceramic insulated form also has been the subject of considerable study. Anderson and others [51], Bentley and Morgan [52], and Wang and Bediones [53] have evaluated the high-temperature, thermoelectric stability of thermocouples insulated with magnesium oxide and sheathed in Inconel and in stainless steel.
90 ControlLogix™ Universal Analog Input Module References [1] Preston-Thomas, H. The International Temperature Scale of 1990 (ITS-90). Metrologia 27, 3-10; 1990. ibid. p. 107. [2] The International Practical Temperature Scale of 1968, Amended Edition of 1975. Metrologia 12, 7-17, 1976. [3] Mangum, B. W.; Furukawa, G. T. Guidelines for realizing the International Temperature Scale of 1990 (ITS-90). Natl. Inst. Stand. Technol. Tech. Note 1265; 1990 August. 190 p. [4] The 1976 Provisional 0.
Appendix B: Thermocouple Descriptions 91 [14] Potts, J. F. Jr.; McElroy, D. L. The effects of cold working, heat treatment, and oxidation on the thermal emf of nickel-base thermoelements. Herzfeld, C. M.; Brickwedde, F. G.; Dahl, A. I.; Hardy, J. D., ed. Temperature: Its Measurement and Control in Science and Industry; Vol. 3, Part 2; New York: Reinhold Publishing Corp.; 1962. 243-264. [15] Burley, N. A.; Ackland, R. G.
92 ControlLogix™ Universal Analog Input Module [24] Glawe, G. E.; Szaniszlo, A. J. Long-term drift of some noble- and refractory-metal thermocouples at 1600K in air, argon, and vacuum. Temperature: Its Measurement and Control in Science and Industry; Vol. 4; Plumb, H. H., ed.; Pittsburgh: Instrument Society of America; 1972. 1645-1662. [25] Walker, B. E.; Ewing, C. T.; Miller, R. R. Thermoelectric instability of some noble metal thermocouples at high temperatures. Rev. Sci. Instrum. 33, 1029-1040; 1962.
Appendix B: Thermocouple Descriptions 93 [33] McLaren, E. H.; Murdock, E. G. Properties of some noble and base metal thermocouples at fixed points in the range 0-1100C. Temperature: Its Measurement and Control in Science and Industry; Vol. 5; Schooley, J. F., ed.; New York: American Institute of Physics; 1982. 953975. [34] Bentley, R. E.; Jones, T. P. Inhomogeneities in type S thermocouples when used to 1064C. High Temperatures- High Pressures 12, 33-45; 1980. [35] Rhys, D. W.; Taimsalu, P.
94 ControlLogix™ Universal Analog Input Module [46] Burley, N. A.; Hess, R. M.; Howie, C. F. Nicrosil and nisil: new nickel-based thermocouple alloys of ultra-high thermoelectric stability. High Temperatures- High Pressures 12, 403-410; 1980. [47] Burley, N. A.; Cocking, J. L.; Burns, G. W.; Scroger, M. G. The nicrosil versus nisil thermocouple: the influence of magnesium on the thermoelectric stability and oxidation resistance of the alloys.
Appendix B: Thermocouple Descriptions 95 [57] Bentley, R. E. The new nicrosil-sheathed type N MIMS thermocouple: an assessment of the first production batch. Mater. Australas. 18(6), 16-18; 1986. [58] Bentley, R. E.; Russell, Nicrosil sheathed mineral-insulated type N thermocouple probes for short-term variable-immersion applications to 1100C. Sensors and Actuators 16, 89-100; 1989. [59] Bentley, R. E.
96 ControlLogix™ Universal Analog Input Module
Appendix C Using Grounded Junction, Ungrounded Junction, and Exposed Junction Thermocouples This appendix describes the types of thermocouples available, and explains the trade-offs in using them with the IF8u module. Thermocouple Types There are three (3) types of thermocouple junctions: • Grounded Junction - The measuring junction is physically connected to the protective sheath forming a completely sealed integral junction.
98 ControlLogix™ Universal Analog Input Module The illustration that follows shows each of the three (3) thermocouple types. Grounded Junction Extension Wire Metal Sheath Measuring Junction is connected to sheath Ungrounded (Insulated) Junction Measuring Junction is isolated from sheath Exposed Junction Measuring Junction has no sheath Isolation The IF8u module provides 12.
99 Appendix B: Using Grounded Junction, Ungrounded Junction, and Exposed Junction Thermocouples For grounded junction thermocouples it is recommended that they have protective sheathes made of electrically insulated material (e.g. ceramic), or the metal protective sheaths be floated. The metal sheaths would need to be floated with respect to any path to chassis ground or to another thermocouple metal sheath.
100 ControlLogix™ Universal Analog Input Module Exposed Junction Thermocouples As shown in the illustration that follows, using exposed junction thermocouples may result in removal of channel to channel isolation. This may occur if multiple exposed thermocouples are in direct contact with electrically conductive process material.
Appendix D Programming Your Module This chapter explains how program your module in the ControlLogix system. It also describes how to the module’s input configuration are incorporated into your ladder logic program. Topics discussed include: • importing the module’s configuration profile • reviewing accessing and altering configuration options.
102 ControlLogix™ Universal Analog Input Module 1. Open your project and go to the “Add I/O module” menu under controller configuration. 2. You will now see the list of all I/O modules. Select the “Generic 1756 I/ O” option. 3. After clicking “OK” you are presented with the following dialog for setting up the general information about the module.
Appendix D: Installing the module using a Generic Module profile 103 Owner Controller Connection (Controller provides configuration) Listen-only controller connection. (Controller does not provide configruration but monitors input data only. Another owner controller must exist.
104 ControlLogix™ Universal Analog Input Module 4. Specify an RPI interval between 10.0 and 750.
Getting Technical Assistance If you need technical assistance, please review the information in Chapter 6, “Testing Your Module,” before calling your local distributor of Spectrum Controls. Note that your module contains electronic components which are susceptible to damage from electrostatic discharge (ESD). An electrostatic charge can accumulate on the surface of ordinary plastic wrapping or cushioning material.
©2002-2011 Spectrum Controls, Inc. All rights reserved. Specifications subject to change without notice. The Encompass logo andControlLogix are trademarks of Rockwell Automation. Publication 0300191-04 Rev. A May 2011. Printed in U.S.A. Corporate Headquarters Spectrum Controls Inc. P.O. Box 6489 Bellevue, WA 98008 USA Fax: 425-641-9473 Tel: 425-746-9481 Web Site: www.spectrumcontrols.com E-mail: spectrum@spectrumcontrols.
