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MicroLogix 1200 RTD/Resistance Input Module
Catalog Number 1762-IR4
Topic
Field Wiring Connections
I/O Memory Mapping
Specifications
North American Hazardous Location Approval
Additional Resources
Installation Instructions
Page
2
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15
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Publication 1762-IN014B-EN-P - July 2013
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Summary of Contents for Allen-Bradley MicroLogix 1200 RTD/Resistance
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Page 1: Table Of Contents
Installation Instructions MicroLogix 1200 RTD/Resistance Input Module Catalog Number 1762-IR4 Topic Page Module Overview Description Module Installation System Assembly Mounting Field Wiring Connections I/O Memory Mapping Specifications North American Hazardous Location Approval Additional Resources Publication 1762-IN014B-EN-P - July 2013... -
Page 2: Module Overview
MicroLogix 1200 RTD/Resistance Input Module Module Overview The 1762-IR4 module receives and stores digitally converted analog data from RTDs or other resistance inputs, such as potentiometers. The module supports connections from any combination of up to 4 RTDs or other resistance inputs. See the input specifications on page 20 for supported RTD and resistance types, their associated temperature ranges, and the analog input signal ranges that each channel supports. -
Page 3: Module Installation
MicroLogix 1200 RTD/Resistance Input Module Module Installation 1762 I/O is suitable for use in an industrial environment when installed in accordance with these instructions. Specifically, this equipment is intended for use in clean, dry environments (Pollution degree 2 ) and to circuits not exceeding Over Voltage Category II (IEC 60664-1). -
Page 4: System Assembly
MicroLogix 1200 RTD/Resistance Input Module 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. Use the pull loop on the connector to disconnect modules. Do not pull on the ribbon cable. - Page 5 MicroLogix 1200 RTD/Resistance Input Module Minimum Spacing Maintain spacing from enclosure walls, wireways, adjacent equipment, etc. Allow 50.8 mm Side Side (2 in.) of space on all sides for MicroLogix 1200 adequate ventilation, as shown: Bottom The 1762 expansion I/O may be mounted horizontally only.
- Page 6 MicroLogix 1200 RTD/Resistance Input Module 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.
- Page 7 Additional grounding connections from the module’s mounting tabs or DIN rail (if used) are not required unless the mounting surface cannot be grounded. Refer to Industrial Automation Wiring and Grounding Guidelines, Allen-Bradley publication 1770-4.1, for additional information. System Wiring Guidelines Consider the following when wiring your system: •...
- Page 8 MicroLogix 1200 RTD/Resistance Input Module RTD Wiring Considerations Since the operating principle of the RTD module is based on the measurement of resistance, take special care when selecting your input cable. For 2-wire or 3-wire configurations, select a cable that has a consistent impedance throughout its entire length.
- Page 9 MicroLogix 1200 RTD/Resistance Input Module RTD Wiring Configurations For a 3-wire configuration, the module can compensate for a maximum cable length associated with an overall cable impedance of 25 ohms. Three configurations of RTDs can be connected to the 1762-IR4 module: •...
- Page 10 MicroLogix 1200 RTD/Resistance Input Module 3-Wire RTD Configuration Cable Shield (to Ground) RTD EXC RTD EXC EXC 2 Sense Sense SENSE 2 Return Return RTN 2 Belden 83503 or 9533 Shielded Cable 4-Wire RTD Configuration Cable Shield (to Ground) RTD EXC...
- Page 11 MicroLogix 1200 RTD/Resistance Input Module 2-Wire Potentiometer Interconnection Potentiometer Cable Shield (to Ground) RTD EXC EXC 2 SENSE 2 Return RTN 2 Belden 9501 Shielded Cable Cable Shield (to Ground) Potentiometer RTD EXC EXC 2 SENSE 2 Return RTN 2...
- Page 12 MicroLogix 1200 RTD/Resistance Input Module 3-Wire Potentiometer Interconnection Run RTD EXC and sense wires from the module to potentiometer terminal and tie terminal to one point. Cable Shield (to Ground) Potentiometer RTD EXC EXC 2 Sense SENSE 2 Return RTN 2...
- Page 13 MicroLogix 1200 RTD/Resistance Input Module Labeling the Terminals A write-on label is provided with the module. Mark the identification of each terminal with permanent ink, and slide the label back into the door. Wiring the Finger-Safe Terminal Block Be careful when stripping wires. Wire fragments that fall into a module ATTENTION could cause damage when power is applied.
- Page 14 MicroLogix 1200 RTD/Resistance Input Module Wire Size and Terminal Screw Torque Each terminal accepts up to two wires with the following restrictions: Wire Type Wire Size Terminal Screw Torque Solid Cu-90 °C (194°F) #14…22 AWG 0.904 Nm (8 lb-in.) Stranded Cu-90 °C (194°F)
- Page 15 MicroLogix 1200 RTD/Resistance Input Module To wire your sensor to the 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 lengths. Strip about 3/16 inch (5 mm) of insulation away to expose the end of the wire.
- Page 16 MicroLogix 1200 RTD/Resistance Input Module Input Data File For each module, slot x, words 0 through 3 contain the analog values of the inputs. Words 4 and 5 provide sensor/channel status feedback. The input data file for each configuration is shown below.
- Page 17 MicroLogix 1200 RTD/Resistance Input Module Make these bit settings To Select 15 14 13 12 11 10 10 Hz 60 Hz 50 Hz 250Hz 500 Hz 1 kHz 1.0 mA 0.5 mA Enable Disable Upscale Downscale Last State Zero °C °F...
- Page 18 MicroLogix 1200 RTD/Resistance Input Module Make these bit settings To Select 15 14 13 12 11 10 Raw/Proportional Engineering Units Engr. Units X 10 Scaled-for-PID Percent Range Enable Disable Module Configuration Word Word 4 of the configuration data file contains the Enable/Disable Cyclic Calibration bit, as shown in the table below.
- Page 19 MicroLogix 1200 RTD/Resistance Input Module Specifications General Specifications Specification Value Dimensions, HxWxD 90 x 40 x 87 mm (3.54 x1.58 x 3.43 in.) height including mounting tabs is 110 mm (4.33 in.) Approximate Shipping Weight 260 g (0.57 lbs.) (with carton) Storage Temperature -40…85 °C (-40…185 °F)
- Page 20 Sigma-Delta Resolution Input filter and configuration dependent. Refer to the MicroLogix 1200 RTD/Resistance Input Module User Manual, publication number 1762-UM003, for more information. Common Mode Rejection 110 dB minimum @ 50 Hz with the 10 or 50 Hz filter selected...
- Page 21 MicroLogix 1200 RTD/Resistance Input Module Specification 1762-IR4 Input Channel Via configuration software screen or the user program (by writing a unique bit Configuration pattern into the module’s configuration file). Refer to your controller’s user manual to determine if user program configuration is supported.
- Page 22 MicroLogix 1200 RTD/Resistance Input Module North American Hazardous Location Approval The following modules are North American Hazardous Location approved: 1762-IR4 The following information applies when Informations sur l’utilisation de cet operating this equipment in hazardous équipement en environnements dangereux: locations: Products marked "CL I, DIV 2, GP A, B, C, D"...
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