Allen-Bradley SLC 500 Installation Instructions Manual
Rtd/resistance input module
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- User manual (294 pages) ,
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Installation Instructions
SLC 500™ RTD/Resistance Input Module
(Catalog Number 1746-NR4)
Inside...............................................................................................page
Hazardous Location Considerations ........................................................ 2
Environnements dangereux ..................................................................... 2
Overview .................................................................................................. 3
Required Tools and Equipment ................................................................ 4
Electrostatic Damage............................................................................... 5
NR4 Power Requirements........................................................................ 5
Modular Chassis Considerations............................................................. 5
Fixed Expansion Chassis Considerations................................................. 6
General Considerations ........................................................................... 6
Module Installation and Removal............................................................ 7
Terminal Block Wiring and Removal ........................................................ 8
Wiring Considerations ............................................................................. 9
Wiring Input Devices to the NR4 Module ............................................. 14
Module Addressing................................................................................ 15
Channel Configuration ........................................................................... 16
Specifications ........................................................................................ 18
For More Information ............................................................................. 24
Publication 1746-IN012B-EN-P - May 2001
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Table of Contents
Related Manuals for Allen-Bradley SLC 500
Summary of Contents for Allen-Bradley SLC 500
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Page 1: Table Of Contents
Installation Instructions SLC 500™ RTD/Resistance Input Module (Catalog Number 1746-NR4) Inside…....................page Hazardous Location Considerations ............2 Environnements dangereux ..............2 Overview ....................3 Required Tools and Equipment ..............4 Electrostatic Damage................5 NR4 Power Requirements................ 5 Modular Chassis Considerations............. 5 Fixed Expansion Chassis Considerations.......... -
Page 2: Hazardous Location Considerations
SLC 500™ RTD/Resistance Input Module 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. EXPLOSION HAZARD WARNING •... -
Page 3: Overview
The RTD module receives and stores digitally converted analog data from RTDs or other resistance inputs such as potentiometers into its image table for retrieval by all fixed and modular SLC 500 processors. An RTD consists of a temperature-sensing element connected by 2, 3 or 4 wires that provide input to the RTD module. -
Page 4: Required Tools And Equipment
SLC 500™ RTD/Resistance Input Module Channel Status LEDs INPUT (Green) Door Label CHANNEL STATUS MODULE STATUS Module Status LED RTD/resistance (Green) SHIELD SHIELD CHL 0 CHL 1 RT D Removable Terminal CHL 0 SENSE Block CHL 1 SENSE CHL 0... -
Page 5: Electrostatic Damage
2-slot fixed expansion chassis on page 6. 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. -
Page 6: Fixed Expansion Chassis Considerations
SLC 500™ RTD/Resistance Input Module Fixed Expansion Chassis Considerations The 2-slot, SLC 500 fixed I/O expansion chassis (1746-A2) IMPORTANT supports many combinations of modules. The combinations that are not supported by the fixed expansion chassis are shown in the table below. For a complete listing of valid combinations... -
Page 7: 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 8: 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. Disconnect power to the SLC before attempting to install, ATTENTION remove, or wire the removable terminal wiring block. -
Page 9: Wiring Considerations
SLC 500™ RTD/Resistance Input Module Terminal Block Removal If the terminal block is removed, use the write-on label located on the side of the terminal block to identify the module location and type. To remove the terminal block: 1. Loosen the two terminal block release screws. - Page 10 SLC 500™ RTD/Resistance Input Module 2-Wire RTD Interconnection Cable Shield Add Jumper Shield CH 0 RTD CH 0 Sense Return Return CH 0 Return Belden #9501 Shielded Cable 3-Wire RTD Interconnection Cable Shield Shield CH 0 RTD Sense Sense CH 0 Sense...
- Page 11 The torque applied to each screw should not exceed 0.7 to 0.9 Nm (6 to 8 in-lb.) for each terminal. • Follow system grounding and wiring guidelines found in your SLC 500 Modular Hardware Style User Manual, publication 1747-6.2.
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Page 12: Wiring Resistance Devices (Potentiometers) To The Nr4 Module
SLC 500™ RTD/Resistance Input Module There are several ways to insure that the lead values match as closely as possible. They are as follows: • Keep lead resistance as small as possible and less than 25Ω. • Use quality cable that has a small tolerance impedance rating. - Page 13 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 CH 0 RTD Sense CH 0 Sense Return CH 0 Return Belden #9501 or #9533 Shielded Cable...
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Page 14: Wiring Input Devices To The Nr4 Module
SLC 500™ RTD/Resistance Input Module Wiring Input Devices to the NR4 Module 2-Conductor Shielded Cable (See Step 4.) Signal Wire Signal Wire Signal Wire Foil Shield Signal Wire (See step 3.) Drain Wire 3-Conductor Shielded Cable (See Step 4.) Signal Wire Signal Wire (See step 3.) -
Page 15: 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... -
Page 16: Channel Configuration
SLC 500™ RTD/Resistance Input Module Channel Configuration Once the module is installed, each channel can be configured to establish the way the channel will operate. You configure the channel by entering bit values into the configuration word using your programming software. Channels 0 through 3 on the NR4 are configured by entering bit values into output words 0 through 3 respectively. - Page 17 SLC 500™ RTD/Resistance Input Module Make these bit settings To Select 15 14 13 12 11 10 10 Hz 50 Hz 60 Hz 250Hz Enable Disable 2.0 mA 0.5 mA Default User-set (Range 0) User-set (Range 1) Invalid Unused (1) Actual value at 0°C is 9.042Ω per SAMA standard RC21-4-1966.
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Page 18: Specifications
SLC 500™ RTD/Resistance Input Module Specifications Electrical Specifications Backplane Current Consumption 50 mA at 5V dc 50 mA at 24V dc Backplane Power Consumption 1.5W maximum (0.3 W at 5V dc, 1.2 W at 24V dc) External Power Supply Requirements... - Page 19 SLC 500™ RTD/Resistance Input Module Physical Specifications LED Indicators 5 green status indicators, one for each of 4 channels and one for module status Module ID Code 3513 Maximum Termination Wire Size Two 14 AWG wire per terminal Maximum Cable Impedance...
- Page 20 (Selectable) 1 Ω or 0.1 Ω for all resistance ranges; or 0.1 Ω or 0.01 Ω for 150 Ω potentiometer. Resistance Scale (Selectable) Refer to the SLC 500™ RTD/Resistance Input Module User Manual , 1746-6.7. Input Step Response Channel Turn-On Requires up to one module update time plus one of the following: •...
- Page 21 SLC 500™ RTD/Resistance Input Module RTD Temperature Ranges, Resolution, and Repeatability RTD Type Temp. Range Temp. Range Resolution Repeatability (2.0 mA Excitation) (0.5 mA Excitation) 100 Ω Platinum -200 °C to +850 °C -200 °C to +850 °C 0.1 °C ±0.2 °C...
- Page 22 SLC 500™ RTD/Resistance Input Module RTD Accuracy and Temperature Drift Specifications RTD Type Temperature Temperature Accuracy Accuracy (0.5 mA (2.0 mA Drift Drift Excitation) Excitation) (0.5 mA Excitation) (2.0 mA Excitation) 100 Ω Platinum ± 1.0 °C ± 0.5 °C ±...
- Page 23 SLC 500™ RTD/Resistance Input Module Module accuracy, using 100Ω or 200Ω platinum RTDs with IMPORTANT 0.5 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.
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Page 24: For More Information
Manual You can view or download publications at http://literature.rockwellautomation.com. Rockwell Automation, Allen-Bradley, SLC 500, and MicroLogix are trademarks of Rockwell Automation, Inc. Trademarks not belonging to Rockwell Automation are property of their respective companies. Publication 1746-IN012B-EN-P - May 2001 PN 40071-133-01(B) Copyright ©...