Table of Contents
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SLC 500™ RTD/Resistance Input
Module
(Catalog Number 1746-NR4)
Installation Instructions
Inside...
Important User Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
For More Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Required Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrostatic Damage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
NR4 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Modular Chassis Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Fixed Expansion Chassis Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Module Installation and Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Terminal Block Wiring and Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Wiring Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Wiring Resistance Devices (Potentiometers) to the NR4 Module . . . . . . . . . . . . . . 13
Wiring Input Devices to the NR4 Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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Related Manuals for Allen-Bradley SLC 500 1746-NR4
Summary of Contents for Allen-Bradley SLC 500 1746-NR4
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Page 1: Table Of Contents
SLC 500™ RTD/Resistance Input Module (Catalog Number 1746-NR4) Installation Instructions Inside… page Important User Information ......... . . 2 For More Information . -
Page 2: Important User Information
Reproduction of the contents of this copyrighted publication, in whole or in part, without written permission of Allen-Bradley Company, Inc., is prohibited. Throughout these installation instructions we use notes to make you aware of... -
Page 3: For More Information
SLC 500™ RTD/Resistance Input Module For More Information As part of our effort to preserve, protect, and improve our environment, Allen- Bradley is reducing the amount of paper we use. Less paper means more options for you. In addition to traditional printed publications and CD-ROM versions, we now offer on-line manuals with the most up-to-date information you can get. -
Page 4: Overview
Once an error has been detected, the module no longer communicates with the SLC processor. Channel states are disabled, and data words are cleared (0). Failure of any diagnostic test results in a non-recoverable error and requires the assistance of your local distributor or Allen-Bradley. Publication 1746-5.17... -
Page 5: Required Tools And Equipment
SLC 500™ RTD/Resistance Input Module Channel Status INPUT LEDs (Green) Door Label CHANNEL STATUS Module Status MODULE STATUS LED (Green) RTD/resistance SHIELD SHIELD CHL 0 CHL 1 Removable CHL 0 Terminal Block SENSE CHL 1 SENSE CHL 0 RETRN CHL 1 RETRN SHIELD SHIELD... -
Page 6: Electrostatic Damage
SLC 500™ RTD/Resistance Input Module Electrostatic Damage Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins or other sensitive areas. Guard against electrostatic damage by observing the following precautions. ATTENTION: Electrostatic discharge can degrade performance or cause permanent damage. -
Page 7: Modular Chassis Considerations
SLC 500™ RTD/Resistance Input Module Modular Chassis Considerations Place your RTD module in any slot of an SLC 500 modular chassis (except slot 0) or a modular expansion chassis. Slot 0 is reserved for the modular processor or adapter modules. Fixed Expansion Chassis Considerations Important: The 2-slot, SLC 500 fixed I/O expansion chassis (1746-A2) -
Page 8: Module Installation And Removal
SLC 500™ RTD/Resistance Input Module Module Installation and Removal When installing the module in a chassis, it is not necessary to remove the terminal block from the module. Module Installation Procedure 1. Align the circuit board of the RTD module with the card guides located at the top and bottom of the chassis. -
Page 9: Terminal Block Wiring And Removal
SLC 500™ RTD/Resistance Input Module Terminal Block Wiring and Removal The RTD module contains an 18-position, removable terminal block. The terminal pin-out is shown below. ATTENTION: Disconnect power to the SLC before attempting to install, remove, or wire the removable terminal wiring block. To avoid cracking the removable terminal block, alternate the removal of the terminal block release screws. -
Page 10: Wiring Considerations
SLC 500™ RTD/Resistance Input Module 2. Grasp the terminal block at the top and bottom and pull outward and down. Wiring Considerations Follow the guidelines below when planning your system wiring. Since the operating principle of the RTD module is based on the measurement of resistance, take special care in selecting your input cable. - Page 11 SLC 500™ RTD/Resistance Input Module 2-Wire RTD Interconnection Cable Shield Add Jumper Shield Chl 0 RTD Chl 0 Sense Return Return Chl 0 Return Belden #9501 Shielded Cable Shield Shield Chl 0 3-Wire RTD Interconnection Chl 1 Cable Shield Chl 0 Sense Chl 1 Sense Chl 0...
- Page 12 SLC 500™ RTD/Resistance Input Module Important: The RTD module requires three wires to compensate for lead resistance error. We recommend that you do not use 2-wire RTDs if long cable runs are required, as it will reduce the accuracy of the system.
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Page 13: Wiring Resistance Devices (Potentiometers) To The Nr4 Module
SLC 500™ RTD/Resistance Input Module When using a 3-wire configuration, the module compensates for resistance error due to lead wire length. For example, in a 3-wire configuration, the module reads the resistance due to the length of one of the wires and assumes that the resistance of the other wire is equal. - Page 14 SLC 500™ RTD/Resistance Input Module 2-Wire Potentiometer Interconnection Cable Shield Add Jumper Potentiometer Shield Chl0 RTD Chl 0 Sense Return Chl 0 Return Belden #9501 Shielded Cable Potentiometer wiper arm can be connected to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance.
- Page 15 SLC 500™ RTD/Resistance Input Module 3-Wire Potentiometer Interconnection Cable Shield Run RTD and sense wires from module to potentiometer terminal and tie them to one point. Shield Potentiometer Chl0 RTD Chl 0 Sense Sense Chl 0 Return Return Belden #83503 or Belden #9533 Shielded Cable Potentiometer wiper arm can be connected to either the RTD or return terminal depending on weather the user wants increasing or decreasing resistance.
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Page 16: Wiring Input Devices To The Nr4 Module
SLC 500™ RTD/Resistance Input Module Wiring Input Devices to the NR4 Module (See Step 4.) 2-Conductor Shielded Cable Signal Wire Signal Wire Signal Wire Signal Wire Drain Wire Foil Shield (See step 3.) Signal Wire (See Step 4.) 3-Conductor Shielded Cable Signal Wire Signal Wire Signal Wire... -
Page 17: Module Addressing
SLC 500™ RTD/Resistance Input Module Module Addressing The following memory map of shows you how the output and input image tables are defined for the RTD module. Bit 15 Bit 0 Address Channel 0 Configuration Word Word 0 O:e.0 Channel 1 Configuration Word Word 1 O:e.1 Channel 2 Configuration Word... - Page 18 SLC 500™ RTD/Resistance Input Module Channel Configuration Word - Bit Definitions Input Type Selection Bit 3 Bit 2 Bit 1 Bit 0 100: Pt RTD (385) 200: Pt RTD (385) 500: Pt RTD (385) 1000: Pt RTD (385) 100: Pt RTD (3916) 200: Pt RTD (3916) 500: Pt RTD (3916) 1000: Pt RTD (3916)
- Page 19 SLC 500™ RTD/Resistance Input Module Channel Configuration Word - Bit Definitions Temperature Units Selection Bit 8 Degrees C Degrees F 1 Filter Frequency Selection Bit 10 Bit 9 10Hz 50 Hz 60 Hz 250Hz Channel Enable Bit 11 Channel Disabled Channel Enabled Excitation Current Selection Bit 12...
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Page 20: Specifications
Module ID Code 3513 Maximum Termination Wire Two 14 AWG wire per terminal Size 25 ohms maximum impedance for 3-wire RTD configuration (see Maximum Cable Impedance Cable Specifications) Terminal Block Removable, Allen-Bradley spare part Cat. No. 1746-RT25G Publication 1746-5.17... - Page 21 SLC 500™ RTD/Resistance Input Module Module Environmental Specifications Operating Temperature 0°C to +60°C (+32°F to +140°F) −40°C to +85°C (−40°F to +185°F) Storage Temperature Relative Humidity 5% to 95% (without condensation) Hazardous Environment Classification Class I, Division 2 Hazardous Environment Agency Certification •...
- Page 22 SLC 500™ RTD/Resistance Input Module RTD Temperature Ranges, Resolution, and Repeatability Temp. Range Temp. Range RTD Type Resolution Repeatability (0.5 mA Excitation) (2.0 mA Excitation) -200 °C to +850 °C -200 °C to +850 °C 0.1 °C ±0.2 °C 100: (-328 °F to +1562 °F) (-328 °F to +1562 °F) (0.2 °F)
- Page 23 SLC 500™ RTD/Resistance Input Module RTD Accuracy and Temperature Drift Specifications Temperature Accuracy Accuracy Temperature Drift Drift RTD Type (0.5 mA (2.0 mA (0.5 mA (2.0 mA Excitation) Excitation) Excitation) Excitation) ± 1.0 °C ± 0.5 °C ± 0.034 °C/°C ±...
- Page 24 SLC 500™ RTD/Resistance Input Module Module accuracy, using 100 : or 200 : platinum RTDs with 0.5 Important: mA excitation current, depends on the following criteria: • Module accuracy is 0.6°C after you apply power to the ± module or perform an autocalibration at 25°C ambient with module operating temperature at 25°C.
- Page 25 SLC 500™ RTD/Resistance Input Module SLC 500 is a trademark of Rockwell Automation. MicroLogix is a trademark of Rockwell Automation. Belden is a trademark of Belden, Inc. Publication 1746-5.17 - July 1999 40071-038-01(B) 1999 Rockwell International. All Rights Reserved. Printed in USA Supersedes Publication 1746-5.17 - June 98...
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