MicroLogix™ 1200 Thermocouple/mV Input Module (Catalog Number 1762-IT4) 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 these products 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.
Table of Contents Preface Who Should Use This Manual . . . . . . . . . . . . . . How to Use This Manual . . . . . . . . . . . . . . . . . . Manual Contents . . . . . . . . . . . . . . . . . . . . . Related Documentation . . . . . . . . . . . . . . . . Conventions Used in This Manual . . . . . . . . . . . Rockwell Automation Support . . . . . . . . . . . . . . Local Product Support . . . . . . . . . . . . . . . . . Technical Product Assistance . . . . . . . . . . . .
Table of Contents ii Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . Terminal Block Layout . . . . . . . . . . . . Labeling the Terminals . . . . . . . . . . . . Wiring the Finger-Safe Terminal Block Wire Size and Terminal Screw Torque Terminal Door Label . . . . . . . . . . . . . Wiring the Module . . . . . . . . . . . . . . . Wiring Diagram . . . . . . . . . . . . . . . . . Cold Junction Compensation . . . . . . . . . . Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents Module Operation vs. Channel Operation . . Power-up Diagnostics . . . . . . . . . . . . . . . . . Channel Diagnostics . . . . . . . . . . . . . . . . . . Invalid Channel Configuration Detection. Over- or Under-Range Detection . . . . . . Open-Circuit Detection . . . . . . . . . . . . . Non-critical vs. Critical Module Errors . . . . . Module Error Definition Table . . . . . . . . . . . Module Error Field. . . . . . . . . . . . . . . . . Extended Error Information Field . . . . . .
Table of Contents iv Appendix E Module Configuration Using MicroLogix 1200 and RSLogix 500 Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1762-IT4 Configuration File . . . . . . . . . . . . . . . . . . . Configuration Using RSLogix 500 Version 5.50 or Higher Generic Extra Data Configuration . . . . . . . . . . . . . . . Configuration Using RSLogix 500 Version 5.2 or Lower . . Glossary Index Publication 1762-UM002A-EN-P - July 2002 . . . . . . . . . .
Preface Read this preface to familiarize yourself with the rest of the manual. This preface covers the following topics: • • • • • who should use this manual how to use this manual related publications conventions used in this manual Rockwell Automation support Who Should Use This Manual Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use Allen-Bradley MicroLogix™ 1200.
Preface 2 Related Documentation The table below provides a listing of publications that contain important information about MicroLogix 1200 systems. For Read this document Document number A user manual containing information on how to install, MicroLogix™ 1200 User Manual use and program your MicroLogix 1200 controller 1762-UM001 An overview of the MicroLogix 1200 System, including 1762 Expansion I/O. MicroLogix™ 1200 Technical Data 1762-TD001 Information on the MicroLogix 1200 instruction set.
Preface Rockwell Automation Support 3 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.
Preface 4 Publication 1762-UM002A-EN-P - July 2002
Chapter 1 Overview This chapter describes the 1762-IT4 Thermocouple/mV Input Module and explains how the module reads thermocouple or millivolt analog input data. Included is information about: • the module’s hardware and diagnostic features • system and module operation • calibration General Description The thermocouple/mV input module supports thermocouple and millivolt signal measurement.
1-2 Overview Millivolt Input Type Range ± 50 mV -50 to +50 mV ± 100 mV -100 to +100 mV Data Formats The data can be configured on board each module as: • • • • • engineering units x 1 engineering units x 10 scaled-for-PID percent of full-scale raw/proportional data Filter Frequencies The module uses a digital filter that provides high frequency noise rejection for the input signals.
Overview 1-3 The illustration below shows the module’s hardware features.
1-4 Overview General Diagnostic Features The module contains a diagnostic LED that helps you identify the source of problems that may occur during power-up or during normal channel operation. The LED indicates both status and power. Power-up and channel diagnostics are explained in Chapter 4, Diagnostics and Troubleshooting. System Overview The modules communicate to the controller through the bus interface. The modules also receive 5 and 24V dc power through the bus interface.
Overview 1-5 Module Operation When the module receives a differential input from an analog device, the module’s circuitry multiplexes the input into an A/D converter. The converter reads the signal and converts it as required for the type of input. The module also continuously samples the CJC sensor and compensates for temperature changes at the terminal block cold junction, between the thermocouple wire and the input channel. See the block diagram below.
1-6 Overview Module Field Calibration The module provides autocalibration, which compensates for offset and gain drift of the A/D converter caused by a temperature change within the module. An internal, high-precision, low drift voltage and system ground reference is used for this purpose. The input module performs autocalibration when a channel is initially enabled. In addition, you can program the module to perform a calibration cycle once every 5 minutes.
Chapter 2 Installation and Wiring This chapter tells you how to: • • • • • Compliance to European Union Directives determine the power requirements for the modules avoid electrostatic damage install the module wire the module’s terminal block wire input devices This product is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.
2-2 Installation and Wiring 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 EN61131-2, 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.
Installation and Wiring 2-3 Hazardous Location Considerations This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or non-hazardous locations only. The following WARNING statement applies to use in hazardous locations. WARNING ! EXPLOSION HAZARD • Substitution of components may impair suitability for Class I, Division 2. • Do no replace components or disconnect equipment unless power has been switched off or the area is known to be non-hazardous.
2-4 Installation and Wiring Remove Power ATTENTION ! Remove power before removing or installing this module. When you remove or install a module with power applied, an electrical arc may occur.
Installation and Wiring 2-5 Mounting ATTENTION ! Do not remove protective debris strip until after the module and all other equipment near the module is mounted and wiring is complete. Once wiring is complete and the module is free of debris, carefully remove protective debris strip. Failure to remove strip before operating can cause overheating. Minimum Spacing TIP ATTENTION ! MicroLogix 1200 1762 I/O Side 1762 I/O Maintain spacing from enclosure walls, wireways, adjacent equipment, etc.
2-6 Installation and Wiring Use DIN rail end anchors (Allen-Bradley part number 1492-EA35 or 1492-EAH35) for environments with vibration or shock concerns. End Anchor End Anchor For environments with extreme vibration and shock concerns, use the panel mounting method described below, instead of DIN rail mounting. TIP Panel Mounting Use the dimensional template shown below to mount the module. The preferred mounting method is to use two M4 or #8 panhead screws per module. M3.
Installation and Wiring System Assembly The expansion I/O module is attached to the controller or another I/O module by means of a ribbon cable after mounting as shown below. TIP ATTENTION ! Field Wiring Connections 2-7 Use the pull loop on the connector to disconnect modules. Do not pull on the ribbon cable. EXPLOSION HAZARD • In Class I, Division 2 applications, the bus connector must be fully seated and the bus connector cover must be snapped in place.
2-8 Installation and Wiring Terminal Block • Do not tamper with or remove the CJC sensor on the terminal block. Removal of the sensor reduces accuracy. • For millivolt sensors, use Belden 8761 shielded, twisted-pair wire (or equivalent) to ensure proper operation and high immunity to electrical noise. • For a thermocouple, use the shielded, twisted-pair thermocouple extension lead wires specified by the thermocouple manufacturer.
Installation and Wiring 2-9 • If it is necessary to connect the shield drain wire at the module end, connect it to earth ground using a panel or DIN rail mounting screw. • Refer to Industrial Automation Wiring and Grounding Guidelines, Allen-Bradley publication 1770-4.1, for additional information. Noise Prevention • Route field wiring away from any other wiring and as far as possible from sources of electrical noise, such as motors, transformers, contactors, and ac devices.
2-10 Installation and Wiring Wiring the Finger-Safe Terminal Block ATTENTION ! Be careful when stripping wires. Wire fragments that fall into a module could cause damage when power is applied. Once wiring is complete, ensure the module is free of all metal fragments. When wiring the terminal block, keep the finger-safe cover in place. 1. Route the wire under the terminal pressure plate. You can use the stripped end of the wire or a spade lug. The terminals will accept a 6.35 mm (0.25 in.) spade lug.
Installation and Wiring 2-11 Wire Size and Terminal Screw Torque Each terminal accepts up to two wires with the following restrictions: Wire Type Solid Stranded Cu-90°C (194°F) Cu-90°C (194°F) Wire Size #14 to #22 AWG #16 to #22 AWG Terminal Screw Torque 0.904 Nm (8 in-lbs) 0.904 Nm (8 in-lbs) Terminal Door Label A removable, write-on label is provided with the module.
2-12 Installation and Wiring cable Cut foil shield and drain wire signal wire signal wire drain wire foil shield signal wire signal wire To wire your module follow these steps. 1. At each end of the cable, strip some casing to expose the individual wires. 2. Trim the signal wires to 2-inch (5 cm) lengths. Strip about 3/16 inch (5 mm) of insulation away to expose the end of the wire. ATTENTION ! Be careful when stripping wires. Wire fragments that fall into a module could cause damage at power up.
Installation and Wiring 2-13 Wiring Diagram CJC sensor IN 0+ CJC+ CJC - IN 1 + within 10V dc IN 1- IN 2+ - grounded thermocouple IN 0- ungrounded thermocouple + + + IN 2IN 3+ - IN 3- Cold Junction Compensation grounded thermocouple TIP When using an ungrounded thermocouple, the shield must be connected to ground at the module end.
2-14 Installation and Wiring Calibration The thermocouple module is initially calibrated at the factory. The module also has an autocalibration function. When an autocalibration cycle takes place, the module’s multiplexer is set to system ground potential and an A/D reading is taken. The A/D converter then sets its internal input to the module’s precision voltage source, and another reading is taken. The A/D converter uses these numbers to compensate for system offset (zero) and gain (span) errors.
Chapter 3 Module Data, Status, and Channel Configuration After installing the 1762-IT4 thermocouple/mV input module, you must configure it for operation using the programming software compatible with the controller (for example, RSLogix 500). Once configuration is complete and reflected in the ladder logic, you need to operate the module and verify its configuration.
3-2 Module Data, Status, and Channel Configuration Input Data File The input data table allows you to access module read data for use in the control program, via word and bit access. The data table structure is shown in table below.
Module Data, Status, and Channel Configuration 3-3 remains until the module begins converting analog data for the previously accepted new configuration. When conversion begins, the bit condition is reset (0). The amount of time it takes for the module to begin the conversion process depends on the number of channels being configured and the amount of configuration data downloaded by the controller.
3-4 Module Data, Status, and Channel Configuration Configuring Channels After module installation, you must configure operation details, such as thermocouple type, temperature units, etc., for each channel. Channel configuration data for the module is stored in the controller configuration file, which is both readable and writable. The configuration data file is shown below. Bit definitions are provided in Channel Configuration on page 3-4.
Module Data, Status, and Channel Configuration Make these bit settings 2 1 0 Decimal Value To Select(1) 10 Hz 1 1 0 6 60 Hz 0 0 0 0 50 Hz 0 0 1 1 250Hz 0 1 1 3 500 Hz 1 0 0 4 1 kHz 1 0 1 5 15 Filter Frequency Open Circuit 3-5 14 13 12 11 10 9 8 7 6 5 4 3 Upscale 0 0 0 Downscale 0 1 32 Hold Last State 1 0 64 Zero 1 1 96 Degrees C 0 0 Degrees F 1 128 Input Type Thermocouple J 0 0 0 0 0 Thermocouple K 0 0 0 1 256 Thermocouple
3-6 Module Data, Status, and Channel Configuration Enabling or Disabling a Channel (Bit 15) You can enable or disable each of the four channels individually using bit 15. The module only scans enabled channels. Enabling a channel forces it to be recalibrated before it measures input data. Disabling a channel sets the channel data word to zero. TIP When a channel is not enabled (0), no input is provided to the controller by the A/D converter.
Module Data, Status, and Channel Configuration TIP 3-7 The engineering units data formats represent real engineering temperature units provided by the module to the controller. The raw/proportional counts, scaled-for-PID and percent of full-scale data formats may yield the highest effective resolutions, but may also require that you convert channel data to real engineering units in your control program.
3-8 Module Data, Status, and Channel Configuration Engineering Units x 10 When using a thermocouple input with this data format, the module scales the input data to the actual temperature values for the selected thermocouple type. With this format, the module expresses temperatures in 1°C or 1°F units. For millivolt inputs, the module expresses voltages in 0.1 mV units. The resolution of the engineering units x 10 data format is dependent on the range selected and the filter selected.
Module Data, Status, and Channel Configuration 3-9 Selecting Temperature Units (Bit 7) The module supports two different linearized/scaled ranges for thermocouples, degrees Celsius (°C) and degrees Fahrenheit (°F). Bit 7 is ignored for millivolt input types, or when raw/proportional, scaled-for-PID, or percent data formats are used.
3-10 Module Data, Status, and Channel Configuration Table 3.2 Open-Circuit Response Definitions Response Option Definition Upscale Sets the input data value to full upper scale value of channel data word. The full-scale value is determined by the selected input type and data format. Downscale Sets the input data value to full lower scale value of channel data word. The low scale value is determined by the selected input type and data format.
Module Data, Status, and Channel Configuration 3-11 Common Mode Rejection is better than 115 dB at 50 and 60 Hz, with the 50 and 60 Hz filters selected, respectively, or with the 10Hz filter selected. The module performs well in the presence of common mode noise as long as the signals applied to the user positive and negative input terminals do not exceed the common mode voltage rating (±10V) of the module. Improper earth ground may be a source of common mode noise.
3-12 Module Data, Status, and Channel Configuration Channel Cut-Off Frequency The filter cut-off frequency, -3 dB, is the point on the frequency response curve where frequency components of the input signal are passed with 3 dB of attenuation. The following table shows cut-off frequencies for the supported filters. Table 3.3 Filter Frequency versus Channel Cut-off Frequency Filter Frequency Cut-off Frequency 10 Hz 2.62 Hz 50 Hz 13.1 Hz 60 Hz 15.7 Hz 250 Hz 65.
Module Data, Status, and Channel Configuration 3-13 Figure 3.1 Frequency Response Graphs 10 Hz Input Filter Frequency 50 Hz Input Filter Frequency 0 –3 dB –20 –20 –40 –40 –60 –60 Gain (dB) Gain (dB) 0 –80 -100 -120 –80 -100 -120 -140 -140 -160 -160 -180 -180 - 200 - 200 0 10 30 20 50 40 60 0 Frequency (Hz) 2.
3-14 Module Data, Status, and Channel Configuration The cut-off frequency for each channel is defined by its filter frequency selection. Choose a filter frequency so that your fastest changing signal is below that of the filter’s cut-off frequency. The cut-off frequency should not be confused with the update time. The cut-off frequency relates to how the digital filter attenuates frequency components of the input signal.
Module Data, Status, and Channel Configuration 3-15 Figure 3.2 Effective Resolution Versus Input Filter Selection for Type B Thermocouples Using 10, 50, and 60 Hz Filters Effective Resolution (°C) 2.5 2.0 10 Hz 1.5 50 Hz 1.0 60 Hz 0.5 0.0 200 400 600 800 1000 1200 1400 1600 1800 2000 Effective Resolution (°F) Temperature (°C) 4. 5 4. 0 3. 5 3. 0 2. 5 2. 0 1. 5 1. 0 0. 5 0.
3-16 Module Data, Status, and Channel Configuration Figure 3.
Module Data, Status, and Channel Configuration 3-17 Figure 3.4 Effective Resolution Versus Input Filter Selection for Type C Thermocouples Using 10, 50, and 60 Hz Filters 0. 8 Effective Resolution (°C) 0. 7 0. 6 0. 5 10 Hz 0. 4 50 Hz 0. 3 60 Hz 0. 2 0. 1 0. 0 0 400 800 1200 1600 2000 2400 Temperature (°C) 1. 6 Effective Resolution (°F) 1. 4 1. 2 1. 0 10 Hz 0. 8 50 Hz 0. 6 60 Hz 0. 4 0. 2 0.
3-18 Module Data, Status, and Channel Configuration Effective Resolution (°C) Figure 3.
Module Data, Status, and Channel Configuration 3-19 Figure 3.6 Effective Resolution Versus Input Filter Selection for Type E Thermocouples Using 10, 50, and 60 Hz Filters 3.0 Effective Resolution (°C) 2.5 2.0 10 Hz 1.5 50 Hz 60 Hz 1.0 0.5 0.0 -400 -200 0 200 400 600 800 1000 Effective Resolution (°F) Temperature (°C) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.
3-20 Module Data, Status, and Channel Configuration Figure 3.
Module Data, Status, and Channel Configuration 3-21 Figure 3.8 Effective Resolution Versus Input Filter Selection for Type J Thermocouples Using 10, 50, and 60 Hz Filters Effective Resolution (°C) 0.4 0.3 10 Hz 50 Hz 0.2 60 Hz 0.1 0 -400 -200 0 200 400 600 800 1000 1200 Temperature (°C) 0.7 Effective Resolution (°F) 0.6 0.5 10 Hz 0.4 50 Hz 0.3 60 Hz 0.2 0.
3-22 Module Data, Status, and Channel Configuration Figure 3.
Module Data, Status, and Channel Configuration 3-23 Effective Resolution (°C) Figure 3.10 Effective Resolution Versus Input Filter Selection for Type K Thermocouples Using 10, 50, and 60 Hz Filters 5. 5 5. 0 4. 5 4. 0 3. 5 3. 0 2. 5 2. 0 1. 5 1. 0 0. 5 0. 0 10 Hz 50 Hz 60 Hz -400 -200 0 200 400 600 800 1000 1200 Temperature (°C) Effective Resolution (°F) 10. 0 9. 0 8. 0 7. 0 6. 0 5. 0 4. 0 3. 0 2. 0 1. 0 0.
3-24 Module Data, Status, and Channel Configuration Figure 3.
Module Data, Status, and Channel Configuration 3-25 Figure 3.12 Effective Resolution Versus Input Filter Selection for Type N Thermocouples Using 10, 50, and 60 Hz Filters 0. 8 Effective Resolution (°C) 0. 7 0. 6 0. 5 10 H z 0. 4 50 H z 0. 3 60 H z 0. 2 0. 1 0. 0 -400 -200 0 200 400 600 800 1000 1200 1400 Temperature (°C) 1.4 Effective Resolution (°F) 1.2 1.0 10 H z 0.8 50 H z 0.6 60 H z 0.4 0.2 0.
3-26 Module Data, Status, and Channel Configuration Figure 3.
Module Data, Status, and Channel Configuration 3-27 Figure 3.14 Effective Resolution Versus Input Filter Selection for Type R Thermocouples Using 10, 50, and 60 Hz Filters 1.4 Effective Resolution (°C) 1.2 1.0 10 Hz 0.8 50 Hz 0.6 60 Hz 0.4 0.2 0.0 0 200 400 600 800 1000 1200 1400 1600 1800 Temperature (°C) Effective Resolution (°F) 2.5 2.0 10 Hz 1.5 50 Hz 1.0 60 Hz 0.5 0.
3-28 Module Data, Status, and Channel Configuration Figure 3.
Module Data, Status, and Channel Configuration 3-29 Figure 3.16 Effective Resolution Versus Input Filter Selection for Type S Thermocouples Using 10, 50, and 60 Hz Filters 1. 4 Effective Resolution (°C) 1. 2 1. 0 10 H z 0. 8 50 H z 0. 6 60 H z 0. 4 0. 2 0. 0 0 200 400 600 800 1000 1200 1400 1600 1800 Temperature (°C) Effective Resolution (°F) 2. 5 2. 0 10 Hz 1. 5 50 Hz 1. 0 60 Hz 0. 5 0.
3-30 Module Data, Status, and Channel Configuration Figure 3.
Module Data, Status, and Channel Configuration 3-31 Figure 3.18 Effective Resolution Versus Input Filter Selection for Type T Thermocouples Using 10, 50, and 60 Hz Filters 4.0 Effective Resolution (°C) 3.5 3.0 2.5 10 Hz 2.0 50 Hz 1.5 60 Hz 1.0 0.5 0.0 -300 -200 -100 0 100 200 300 400 Temperature (°C) 7.0 Effective Resolution (°F) 6.0 5.0 10 Hz 4.0 50 Hz 3.0 60 Hz 2.0 1.0 0.
3-32 Module Data, Status, and Channel Configuration Figure 3.
Module Data, Status, and Channel Configuration 3-33 Table 3.4 Effective Resolution vs. Input Filter Selection for Millivolt Inputs Filter Frequency ±50mV ±100mV 10 Hz 6 µV 6 µV 50 Hz 9 µV 12 µV 60 Hz 9 µV 12 µV 250 Hz 125 µV 150 µV 500 Hz 250 µV 300 µV 1 kHz 1000 µV 1300 µV The resolutions provided by the filters apply to the raw/proportional data format only.
3-34 Module Data, Status, and Channel Configuration Channel update time is dependent upon the input filter selection. The following table shows the channel update times. Table 3.5 Channel Update Time Filter Frequency Channel Update Time 10 Hz 303 ms 50 Hz 63 ms 60 Hz 53 ms 250 Hz 15 ms 500 Hz 9 ms 1 kHz 7 ms The CJC input is only sampled if one or more channels are enabled for any thermocouple type.
Module Data, Status, and Channel Configuration 3-35 separate ADC self-calibration and offset calibration cycles only if their filter configurations are different than those of previously calibrated channels. Following all input channel calibration cycles, the CJC sensor channel receives a separate ADC self-calibration cycle. The time added to this cycle is determined by the filter setting for the CJC, which is set to the lowest filter setting of any input configured as a thermocouple.
3-36 Module Data, Status, and Channel Configuration EXAMPLE 2.Three Channels Enabled for Different Inputs Channel 0 Input: Type J Thermocouple with 10 Hz filter Channel 1 Input: Type J Thermocouple with 60 Hz filter Channel 2 Input: ±100 mV with 250 Hz filter From Table 3.5, Channel Update Time, on page 3-34: Module Update Time = Ch 0 Update Time + Ch 1 Update Time + Ch 2 Update Time + CJC Update Time (uses lowest thermocouple filter selected) = 303 ms + 53 ms + 15 ms + 303 ms = 674 ms EXAMPLE 3.
Module Data, Status, and Channel Configuration 3-37 Impact of Autocalibration on Module Startup During Mode Change Regardless of the selection of the Enable/Disable Cyclic Calibration function, an autocalibration cycle occurs automatically on a mode change from Program-to-Run and on subsequent module startups/initialization for all configured channels. During module startup, input data is not updated by the module and the General Status bits (S0 to S5) are set to 1, indicating a Data Not Valid condition.
3-38 Module Data, Status, and Channel Configuration Publication 1762-UM002A-EN-P - July 2002
Chapter 4 Diagnostics and Troubleshooting This chapter describes troubleshooting the thermocouple/mV input module. This chapter contains information on: • • • • Safety Considerations safety considerations while troubleshooting internal diagnostics during module operation module errors contacting Rockwell Automation for technical assistance Safety considerations are an important element of proper troubleshooting procedures.
4-2 Diagnostics and Troubleshooting Stand Clear of Equipment When troubleshooting any system problem, have all personnel remain clear of the equipment. The problem could be intermittent, and sudden unexpected machine motion could occur. Have someone ready to operate an emergency stop switch in case it becomes necessary to shut off power.
Diagnostics and Troubleshooting Power-up Diagnostics At module power-up, a series of internal diagnostic tests are performed. If these diagnostic tests are not successfully completed, the module status LED remains off and a module error is reported to the controller. If module status LED is: Channel Diagnostics 4-3 Indicated condition: Corrective action: On Proper Operation No action required. Off Module Fault Cycle power. If condition persists, replace the module.
4-4 Diagnostics and Troubleshooting Open-Circuit Detection On each scan, the module performs an open-circuit test on all enabled channels. Whenever an open-circuit condition occurs, the open-circuit bit for that channel is set in input data word 6. Possible causes of an open circuit include: • • • • Non-critical vs.
Diagnostics and Troubleshooting 4-5 in the controller’s I/O status file. Refer to your controller manual for details. Table 4.2 Module Error Types Error Type Module Error Field Value Bits 11 through 9 (binary) Description No Errors 000 No error is present. The extended error field holds no additional information. Hardware Errors 001 General and specific hardware error codes are specified in the extended error information field.
4-6 Diagnostics and Troubleshooting Error Codes The table below explains the extended error code. Table 4.
Diagnostics and Troubleshooting Contacting Rockwell Automation 4-7 If you need to contact Rockwell Automation for assistance, please have the following information available when you call: • a clear statement of the problem, including a description of what the system is actually doing. Note the LED state; also note data and configuration words for the module. • a list of remedies you have already tried • processor type and firmware number (See the label on the processor.
4-8 Diagnostics and Troubleshooting Publication 1762-UM002A-EN-P - July 2002
Appendix A Specifications General Specifications Specification Value Dimensions 90 mm (height) x 87 mm (depth) x 40 mm (width) height including mounting tabs is 110 mm 3.54 in. (height) x 3.43 in. (depth) x 1.58 in. (width) height including mounting tabs is 4.33 in. Approximate Shipping Weight (with carton) 220g (0.53 lbs.
A-2 Specifications Specification Value Electrical /EMC: The module has passed testing at the following levels: • ESD Immunity (EN61000-4-2) • 4 kV contact, 8 kV air, 4 kV indirect • Radiated Immunity (EN61000-4-3) • 10 V/m , 80 to 1000 MHz, 80% amplitude modulation, +900 MHz keyed carrier • Fast Transient Burst (EN61000-4-4) • 2 kV, 5kHz • Surge Immunity (EN61000-4-5) • 1kV galvanic gun • Conducted Immunity (EN61000-4-6) • 10V, 0.
Specifications Specification Value Module Error over Full Temperature Range (0 to +55°C [+32°F to +131°F]) See “Accuracy” on page A-4. CJC Accuracy ±1.3°C (±2.34°F) A-3 Maximum Overload at Input ±35V dc continuous(1) Terminals Input Group to Bus Isolation 720V dc for 1 minute (qualification test) 30V ac/30V dc working voltage Input Channel Configuration via configuration software screen or the user program (by writing a unique bit pattern into the module’s configuration file).
A-4 Specifications Accuracy With Autocalibration Enabled Without Autocalibration Accuracy(2) (3) for 10 Hz, 50 Hz and 60 Hz Filters (max.) Maximum Temperature Drift(2) (4) at 25°C [77°F] Ambient at 0 to 60°C [32 to 140°F] Ambient at 0 to 60°C [32 to 140°F] Ambient ±0.6°C [± 1.1°F] ±0.9°C [± 1.7°F] ±0.0218°C/°C [±0.0218°F/°F] Thermocouple N (-200°C to +1300°C [-328°F to 2372°F]) ±1°C [± 1.8°F] ±1.5°C [±2.7°F] ±0.0367°C/°C [±0.0367°F/°F] Thermocouple N (-210°C to -200°C [-346°F to -328°F]) ±1.
Specifications A-5 Accuracy Versus Thermocouple Temperature and Filter Frequency The following graphs show the module’s accuracy when operating at 25°C for each thermocouple type over the thermocouple’s temperature range for each frequency. The effect of errors in cold junction compensation is not included. Figure A.1 Module Accuracy at 25°C (77°F) Ambient for Type B Thermocouple Using 10, 50, and 60 Hz Filter 4.0 3.5 Accuracy °C 3.0 2.5 10 Hz 2.0 50 Hz 1.5 60 Hz 1.0 0.5 0.
A-6 Specifications Figure A.
Specifications A-7 Accuracy °C Figure A.3 Module Accuracy at 25°C (77°F) Ambient for Type C Thermocouple Using 10, 50, and 60 Hz Filter 1. 8 1. 6 1. 4 1. 2 1. 0 0. 8 0. 6 0. 4 0. 2 0. 0 10 Hz 50 Hz 60 Hz 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 Thermocouple Temperature °C 3.5 3.0 Accuracy °F 2.5 10 Hz 2.0 50 Hz 1.5 60 Hz 1.0 0.5 0.
A-8 Specifications Accuracy °C Figure A.
Specifications A-9 Figure A.5 Module Accuracy at 25°C (77°F) Ambient for Type E Thermocouple Using 10, 50, and 60 Hz Filter 5. 0 Accuracy °C 4. 0 10 Hz 3. 0 50 Hz 2. 0 60 Hz 1. 0 0. 0 -400 -200 0 200 400 600 800 1000 Accuracy °F Thermocouple Temperature °C 9. 0 8. 0 7. 0 6. 0 5. 0 4. 0 3. 0 2. 0 1. 0 0.
A-10 Specifications Figure A.
Specifications A-11 Figure A.7 Module Accuracy at 25°C (77°F) Ambient for Type J Thermocouple Using 10, 50, and 60 Hz Filter 0.7 0.6 Accuracy °C 0.5 10 Hz 0.4 50 Hz 0.3 60 Hz 0.2 0.1 0 -400 -200 0 200 400 600 800 1000 1200 Thermocouple Temperature °C 1.2 Accuracy °F 1.0 0.8 10 Hz 0.6 50 Hz 60 Hz 0.4 0.2 0.
A-12 Specifications Figure A.
Specifications A-13 Accuracy °C Figure A.9 Module Accuracy at 25°C (77°F) Ambient for Type K Thermocouple Using 10, 50, and 60 Hz Filter 9. 0 8. 0 7. 0 6. 0 5. 0 4. 0 3. 0 2. 0 1. 0 0. 0 10 Hz 50 Hz 60 Hz -400 -200 0 200 400 600 800 1000 1200 1400 Thermocouple Temperature °C 16.0 14.0 Accuracy °F 12.0 10.0 10 Hz 8. 0 50 Hz 6. 0 60 Hz 4. 0 2. 0 0.
A-14 Specifications Accuracy °C Figure A.
Specifications A-15 Figure A.11 Module Accuracy at 25°C (77°F) Ambient for Type N Thermocouple Using 10, 50, and 60 Hz Filter 1.4 1.2 Accuracy °C 1.0 10 H z 0.8 50 H z 0.6 60 H z 0.4 0.2 0.0 -400 -200 0 200 400 600 800 1000 1200 1400 Thermocouple Temperature °C 2.5 Accuracy °F 2.0 10 H z 1.5 50 H z 1.0 60 H z 0.5 0.
A-16 Specifications Figure A.
Specifications A-17 Figure A.13 Module Accuracy at 25°C (77°F) Ambient for Type R Thermocouple Using 10, 50, and 60 Hz Filter 2.5 Accuracy °C 2.0 10 Hz 1.5 50 Hz 1.0 60 Hz 0.5 0.0 0 200 400 600 800 1000 1200 1400 1600 1800 Accuracy °F Thermocouple Temperature °C 4. 5 4. 0 3. 5 3. 0 2. 5 2. 0 1. 5 1. 0 0. 5 0.
A-18 Specifications Figure A.
Specifications A-19 Figure A.15 Module Accuracy at 25°C (77°F) Ambient for Type S Thermocouple Using 10, 50, and 60 Hz Filter 2. 5 Accuracy °C 2. 0 10 Hz 1. 5 50 Hz 1. 0 60 Hz 0. 5 0. 0 0 200 400 600 800 1000 1200 1400 1600 1800 Accuracy °F Thermocouple Temperature °C 4. 5 4. 0 3. 5 3. 0 2. 5 2. 0 1. 5 1. 0 0. 5 0.
A-20 Specifications Figure A.
Specifications A-21 Figure A.
A-22 Specifications Figure A.
Appendix B Two’s Complement Binary Numbers The processor memory stores 16-bit binary numbers. Two’s complement binary is used when performing mathematical calculations internal to the processor. Analog input values from the analog modules are returned to the processor in 16-bit two’s complement binary format. For positive numbers, the binary notation and two’s complement binary notation are identical.
B-2 Two’s Complement Binary Numbers Negative Decimal Values In two’s complement notation, the far left position is always 1 for negative values. The equivalent decimal value of the binary number is obtained by subtracting the value of the far left position, 32768, from the sum of the values of the other positions. In the figure below (all positions are 1), the value is 32767 - 32768 = -1.
Appendix C Thermocouple Descriptions The information in this appendix 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.
C-2 Thermocouple Descriptions the purity of commercial type B materials that are used in many industrial thermometry applications that meet the calibration tolerances described later in this section. Both thermoelements will typically have significant impurities of elements such as palladium, iridium, iron, and silicon [38]. Studies by Ehringer [39], Walker et al.
Thermocouple Descriptions C-3 1100°C, an additional measurement error of 3µV (about 0.3°C) would be insignificant in most instances. ASTM Standard E230-87 in the 1992 Annual Book of ASTM Standards [7] specifies that the initial calibration tolerances for type B commercial thermocouples be ±0.5 percent between 870°C and 1700°C. Type B thermocouples can also be supplied to meet special tolerances of ±0.25 percent. Tolerances are not specified for type B thermocouples below 870°C.
C-4 Thermocouple Descriptions Type E thermocouples are recommended by the ASTM [5] for use in the temperature range from -200°C to 900°C in oxidizing or inert atmospheres. If used for extended times in air above 500°C, heavy gauge wires are recommended because the oxidation rate is rapid at elevated temperatures. About 50 years ago, Dahl [11] studied the thermoelectric stability of EP and EN type alloys when heated in air at elevated temperatures. His work should be consulted for details.
Thermocouple Descriptions C-5 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, 870°C, given in the ASTM standard [7] for protected type E thermocouples applies to AWG 8 (3.25 mm) wire. It decreases to 650°C for AWG 14 (1.63 mm), 540°C for AWG 20 (0.81 mm), 430°C for AWG 24 or 28 (0.51 mm or 0.33 mm), and 370°C for AWG 30 (0.25 mm).
C-6 Thermocouple Descriptions emphasized that type JN thermoelements are NOT generally interchangeable with type TN (or EN) thermoelements, although they are all referred to as “constantan”. In order to provide some differentiation in nomenclature, type JN is often referred to as SAMA constantan. Type J thermocouples are recommended by the ASTM [5] for use in the temperature range from 0°C to 760°C in vacuum, oxidizing, reducing, or inert atmospheres.
Thermocouple Descriptions C-7 The suggested upper temperature limit of 760°C given in the above ASTM standard [7] for protected type J thermocouples applies to AWG 8 (3.25 mm) wire. For smaller diameter wires the suggested upper temperature limit decreases to 590°C for AWG 14 (1.63 mm), 480°C for AWG 20 (0.81 mm), 370°C for AWG 24 or 28 (0.51 mm or 0.33 mm), and 320°C for AWG 30 (0.25 mm).
C-8 Thermocouple Descriptions When oxidation occurs it normally leads to a gradual increase in the thermoelectric voltage with time. The magnitude of the change in the thermoelectric voltage and the physical life of the thermocouple will depend upon such factors as the temperature, the time at temperature, the diameter of the thermoelements and the conditions of use.
Thermocouple Descriptions Type N Thermocouples C-9 This section describes Nickel-Chromium-Silicon Alloy Versus Nickel-Silicon-Magnesium Alloy thermocouples, commonly referred to as type N thermocouples. This type is the newest of the letter-designated thermocouples. It offers higher thermoelectric stability in air above 1000°C and better air-oxidation resistance than types E, J, and K thermocouples. The positive thermoelement, NP, is an alloy that typically contains about 84 percent nickel, 14 to 14.
C-10 Thermocouple Descriptions calibration. In addition, their use in atmospheres with low, but not negligible, oxygen content is not recommended, since it can lead to changes in calibration due to the preferential oxidation of chromium in the positive thermoelement.
Thermocouple Descriptions C-11 one-half the standard tolerances given above. Tolerances are not specified for type N thermocouples below 0°C. The suggested upper temperature limit of 1260°C given in the ASTM standard [7] for protected type N thermocouples applies to AWG 8 (3.25 mm) wire. It decreases to 1090°C for AWG 14 (1.63 mm), 980°C for AWG 20 (0.81 mm), 870°C for AWG 24 or 28 (0.51 mm or 0.33 mm), and 760°C for AWG 30 (0.25 mm).
C-12 Thermocouple Descriptions Szaniszlo [24], and Walker et al [25,26] have determined the effects that prolonged exposure at elevated temperatures (>1200°C) in vacuum, air, and argon atmospheres have on the thermoelectric voltages of type R thermocouples. ASTM Standard E230-87 in the 1992 Annual Book of ASTM Standards [7] specifies that the initial calibration tolerances for type R commercial thermocouples be ±1.5°C or ±0.25 percent (whichever is greater) between 0°C and 1450°C.
Thermocouple Descriptions C-13 Research [27] demonstrated that type S thermocouples can be used from -50°C to the platinum melting-point temperature. They may be used intermittently at temperatures up to the platinum melting point and continuously up to about 1300°C with only small changes in their calibrations.
C-14 Thermocouple Descriptions and physical inhomogeneities in the thermocouple and thereby limit its accuracy in this range. They emphasized the important of annealing techniques. The positive thermoelement is unstable in a thermal neutron flux because the rhodium converts to palladium. The negative thermoelement is relatively stable to neutron transmutation. Fast neutron bombardment, however, will cause physical damage, which will change the thermoelectric voltage unless it is annealed out.
Thermocouple Descriptions C-15 family of copper-nickel alloys containing anywhere from 45 to 60 percent copper. These alloys also typically contain small percentages of cobalt, manganese and iron, as well as trace impurities of other elements such as carbon, magnesium, silicon, etc. The constantan for type T thermocouples usually contains about 55 percent copper, 45 percent nickel, and small but thermoelectrically significant amounts, about 0.1 percent or larger, of cobalt, iron, or manganese.
C-16 Thermocouple Descriptions heating in air at 500°C. At this temperature the type TN thermoelements have good resistance to oxidation and exhibit only small voltage changes heated in air for long periods of time, as shown by the studies of Dahl [11]. Higher operating temperatures, up to at least 800°C, are possible in inert atmospheres where the deterioration of the type TP thermoelement is no longer a problem.
Thermocouple Descriptions References C-17 [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 0.5 to 30 K Temperature Scale.
C-18 Thermocouple Descriptions Vol. 5, Schooley, J. F., ed.; New York: American Institute of Physics; 1982. 1159-1166. [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.
Thermocouple Descriptions C-19 Temperature: Its Measurement and Control in Science and Industry; Vol. 6; Schooley, J. F., ed.; New York: American Institute of Physics; 1992. 559-564. [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.
C-20 Thermocouple Descriptions [32] McLaren, E. H.; Murdock, E. G. The properties of Pt/PtRh thermocouples for thermometry in the range 0-1100°C: II. Effect of heat treatment on standard thermocouples. National Research Council of Canada Publication APH 2213/NRCC 17408; 1979. [33] McLaren, E. H.; Murdock, E. G. Properties of some noble and base metal thermocouples at fixed points in the range 0-1100°C. Temperature: Its Measurement and Control in Science and Industry; Vol. 5; Schooley, J. F., ed.
Thermocouple Descriptions C-21 [44] Burley, N. A.; Powell, R. L.; Burns, G. W.; Scroger, M. G. The nicrosil versus nisil thermocouple: properties and thermoelectric reference data. Natl. Bur. Stand. (U.S.) Monogr. 161; 1978 April. 167p. [45] Burley, N. A.; Jones, T. P. Practical performance of nicrosil-nisil thermocouples. Temperature Measurement, 1975; Billing, B. F.; Quinn, T. J., ed.; London and Bristol: Institute of Physics; 1975. 172-180. [46] Burley, N. A.; Hess, R. M.; Howie, C. F.
C-22 Thermocouple Descriptions [54] Burley, N. A. N-CLAD-N: A novel advanced type N integrally-sheathed thermocouple of ultra-high thermoelectric stability. High Temperatures- High Pressures 8, 609-616; 1986. [55] Burley, N. A. A novel advanced type N integrally-sheathed thermocouple of ultra-high thermoelectric stability. Thermal and Temperature Measurement in Science and Industry; 3rd Int. IMEKO Conf.; Sheffield; Sept. 1987. 115-125. [56] Burley, N. A.
Appendix D Using Thermocouple Junctions This appendix describes the types of thermocouple junctions available, and explains the trade-offs in using them with the 1762-IT4 thermocouple/mV analog input module. ATTENTION ! Take care when choosing a thermocouple junction, and connecting it from the environment to the module. If you do not take adequate precautions for a given thermocouple type, the electrical isolation of the module might be compromised.
D-2 Using Thermocouple Junctions The shield input terminals for a grounded junction thermocouple are connected together and then connected to chassis ground. Use of this thermocouple with an electrically conductive sheath removes the thermocouple signal to chassis ground isolation of the module. In addition, if multiple grounded junction thermocouples are used, the module channel-to-channel isolation is removed, since there is no isolation between signal and sheath (sheaths are tied together).
Using Thermocouple Junctions D-3 Measuring Junction Isolated from Sheath Using an Exposed Junction Thermocouple An exposed junction thermocouple uses a measuring junction that does not have a protective metal sheath. A thermocouple with this junction type provides the fastest response time but leaves thermocouple wires unprotected against corrosive or mechanical damage.
D-4 Using Thermocouple Junctions To prevent violation of channel-to-channel isolation: • For multiple exposed junction thermocouples, do not allow the measuring junctions to make direct contact with electrically conductive process material. • Preferably use a single exposed junction thermocouple with multiple ungrounded junction thermocouples. • Consider using all ungrounded junction thermocouples instead of the exposed junction type.
Appendix E Module Configuration Using MicroLogix 1200 and RSLogix 500 This appendix examines the 1762-IT4 module’s addressing scheme and describes module configuration using RSLogix 500 and a MicroLogix 1200 controller. Module Addressing The following memory map shows the input image table for the module. Detailed information on the image table is located in Chapter 3.
E-2 Module Configuration Using MicroLogix 1200 and RSLogix 500 1762-IT4 Configuration File The configuration file contains information you use to define the way a specific channel functions. The configuration file is explained in more detail in Configuring Channels on page 3-4. The configuration file is modified using the programming software configuration screen. For an example of module configuration using RSLogix 500, see Configuration Using RSLogix 500 Version 5.50 or Higher on page E-2. Table 5.
Module Configuration Using MicroLogix 1200 and RSLogix 500 E-3 Start RSLogix and create a MicroLogix 1200 application. The following screen appears: While offline, double-click on the IO Configuration icon under the controller folder and the following IO Configuration screen appears. This screen allows you to manually enter expansion modules into expansion slots, or to automatically read the configuration of the controller.
E-4 Module Configuration Using MicroLogix 1200 and RSLogix 500 A communications dialog appears, identifying the current communications configuration so that you can verify the target controller. If the communication settings are correct, click on Read IO Config. The actual I/O configuration is displayed. In this case, it matches our manual configuration.
Module Configuration Using MicroLogix 1200 and RSLogix 500 E-5 The 1762-IT4 module is installed in slot 1. To configure the module, double-click on the module/slot. The general configuration screen appears. Configuration options for channels 0 to 2 are located on a separate tab from channel 3, as shown below. To enable a channel, click its Enable box so that a check mark appears in it. For optimum module performance, disable any channel that is not hardwired to a real input.
E-6 Module Configuration Using MicroLogix 1200 and RSLogix 500 The Cal tab contains a check box for disabling cyclic calibration. See Selecting Enable/Disable Cyclic Calibration (Word 4, Bit 0) on page 3-14 for more information. Generic Extra Data Configuration This tab redisplays the configuration information entered on the 1762-IT4 configuration screen in raw data format. As explained on page E-7, you can enter the configuration information using this tab instead of using the Chan 0-2 and Chan 3 tabs.
Module Configuration Using MicroLogix 1200 and RSLogix 500 Configuration Using RSLogix 500 Version 5.2 or Lower E-7 If you do not have version 5.5 or higher of RSLogix 500, you can still configure your module, using the Generic Extra Data Configuration dialog. The 1762-IT4 uses six 16-bit binary numbers to configure each of its four channels. To properly configure and enable input channel 1 for the setting in the table below, add the decimal values given to each of the six parameters.
E-8 Module Configuration Using MicroLogix 1200 and RSLogix 500 Publication 1762-UM002A-EN-P - July 2002
Glossary The following terms and abbreviations are used throughout this manual. For definitions of terms not listed here refer to Allen-Bradley’s Industrial Automation Glossary, Publication AG-7.1. A/D Converter– Refers to the analog to digital converter inherent to the module. The converter produces a digital value whose magnitude is proportional to the magnitude of an analog input signal. attenuation – The reduction in the magnitude of a signal as it passes through a system.
Glossary G-2 cut-off frequency – The frequency at which the input signal is attenuated 3 dB by a 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. data word – A 16-bit integer that represents the value of the input channel. The channel data word is valid only when the channel is enabled and there are no channel errors. When the channel is disabled the channel data word is cleared (0).
Glossary G-3 is expressed in percent full-scale input. See the variation from the straight line due to linearity error (exaggerated) in the example below. Actual Transfer Function Ideal Transfer LSB – Least significant bit. The LSB represents the smallest value within a string of bits. For analog modules, 16-bit, two’s complement binary codes are used in the I/O image. For analog inputs, the LSB is defined as the rightmost bit of the 16-bit field (bit 0).
Glossary G-4 sampling time – The time required by the A/D converter to sample an input channel. status word – Contains status information about the channel’s current configuration and operational state. You can use this information in your ladder program to determine whether the channel data word is valid. step response time – The time required for the channel data word signal to reach a specified percentage of its expected final value, given a full-scale step change in the input signal.
Index Numerics -3 dB frequency 3-12 A A/D definition G-1 abbreviations G-1 accuracy A-4 vs temperature and filter frequency A-5– A-22 analog input module overview 1-1, 4-1 attenuation cut-off frequency 3-12 definition G-1 autocalibration module update time 3-34 B bus connector definition G-1 bus interface 1-4 C calibration 1-6 calibration, cyclic 3-14 channel definition G-1 channel configuration 3-4 channel configuration word 3-4 channel diagnostics 4-3 channel status LED 1-4 channel update time definiti
2 Index extended error information field 4-5 F fault condition at power-up 1-4 filter definition G-2 filter frequency definition G-2 effect on effective resolution 3-14 effect on noise rejection 3-10 effect on step response 3-11 selecting 3-10 full-scale definition G-2 full-scale range definition G-2 G gain drift definition G-2 general status bits 3-2 grounding 2-8 H hardware errors 4-5 heat considerations 2-4 I input data formats engineering units x 1 3-7 engineering units x 10 3-8 percent range 3-8
Index overall accuracy definition G-3 over-range flag bits 3-3 P positive decimal values B-1 power-up diagnostics 4-3 power-up sequence 1-4 program alteration 4-2 R resolution definition G-3 S safety circuits 4-2 sampling time definition G-4 scan time G-3 specifications A-1 status word definition G-4 step response effects of filter frequency 3-11 step response time definition G-4 system operation 1-4 T terminal door label 2-11 thermocouple accuracy A-4 definition G-4 descriptions C-1 exposed junction D
4 Index U under-range flag bits 3-3 update time 3-33 update time. See channel update time. update time. See module update time.
Publication 1762-UM002A-EN-P - July 2002 5 Copyright © 2002 Rockwell Automation. All rights reserved. Printed in the U.S.A.
