Rockwell Automation 1746-NR8 Installation Instructions
Installation Instructions
SLC 500™ RTD/Resistance Input Module
(Catalog Number 1746-NR8)
Inside… page
Important User Information ..................................................................... 2
For More Information ............................................................................... 3
Hazardous Location Considerations ....................................................... 4
Environnements dangereux .................................................................... 4
Hazardous Location Considerations ........................................................ 4
Required Tools and Equipment ................................................................ 6
Electrostatic Damage............................................................................... 7
Power Requirements................................................................................ 7
Modular Chassis Considerations ............................................................. 8
Fixed Expansion Chassis Considerations ................................................. 8
General Considerations ........................................................................... 8
Module Installation and Removal............................................................ 9
Terminal Block Wiring and Removal...................................................... 10
Wiring Considerations ........................................................................... 11
Wiring Resistance Devices (Potentiometers) to the Module ................ 14
Wiring Input Devices to the NR8 Module ............................................. 15
Specifications ........................................................................................ 16
Publication 1746-IN007C-EN-P - December 2002
2 SLC 500™ RTD/Resistance Input Module
Important User Information
Because of the variety of uses for the products described in this publication, those
responsible for the application and use of this control equipment 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.
The illustrations, charts, sample programs and layout examples shown in this guide
are intended solely for purposes of example. Since there are many variables and
requirements associated with any particular installation, Allen-Bradley does not
assume responsibility or liability (to include intellectual property liability) for actual
use based upon the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the Application,
Installation, and Maintenance of Solid-State Control (available from your local
Allen-Bradley office), describes some important differences between solid-state
equipment and electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.
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
safety considerations:
ATTENTION
Identifies information about practices or circumstances that
can lead to personal injury or death, property damage or
economic loss.
!
Attention statements help you to:
• identify a hazard
• avoid the hazard
• recognize the consequences
IMPORTANT
Publication 1746-IN007C-EN-P - December 2002
Identifies information that is critical for successful application
and understanding of the product.
SLC 500™ RTD/Resistance Input Module 3
For More Information
Related Publications
For Refer to this Document Pub. No.
A more detailed description on how to install
and use your RTD/Resistance Input Module.
A more detailed description on how to install
and use your modular SLC 500 system.
A more detailed description on how to install
and use your fixed SLC 500 system.
A reference manual that contains status file
data, instruction set, and troubleshooting
information.
How to Get More Information
If you would like a manual, you can:
• download a free electronic version from the internet at
www.theautomationbookstore.com
• purchase a printed manual by:
– contacting your local distributor or Rockwell Automation representative
– visiting www.theautomationbookstore.com
and placing your order
– calling 1.800.963.9548 (USA/Canada) or 001.330.725.1547 (Outside
USA/Canada)
SLC 500™ RTD/Resistance
Input Module User Manual
SLC 500™ Modular Hardware
Style Installation and Operation
Manual
SLC 500™ Fixed Hardware
Style Installation and Operation
Manual
SLC 500™ Instruction Set
Reference Manual
1746-UM003
1747-UM011
1747-6.21
1747-RM001
Publication 1746-IN007C-EN-P - December 2002
4 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.
WARNING
!
EXPLOSION HAZARD
• Substitution of components may impair suitability for Class
I, Division 2.
• Do not replace components or disconnect equipment
unless power has been switched off.
• Do not connect or disconnect components unless power
has been switched off.
• All wiring must comply with N.E.C. article 501-4(b).
Environnements dangereux
Cet équipement est conçu pour être utilisé dans des environnements de Classe 1,
Division 2, Groupes A, B, C, D ou non dangereux. La mise en garde suivante
s’applique à une utilisation dans des environnements dangereux.
ATTENTION
!
DANGER D’EXPLOSION
• La substitution de composants peut rendre cet
équipement impropre à une utilisation en
environnement de Classe 1, Division 2.
• Ne pas remplacer de composants ou déconnecter
l'équipement sans s'être assuré que l'alimentation est
coupée.
• Ne pas connecter ou déconnecter des composants sans
s'être assuré que l'alimentation est coupée.
Publication 1746-IN007C-EN-P - December 2002
SLC 500™ RTD/Resistance Input Module 5
Overview
The RTD (Resistance Temperature Detector) 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. The module supports connections from any
combination of up to eight RTDs of various types (for example: platinum, nickel,
copper, or nickel-iron) or other resistance inputs. See the input specifications
beginning on page 19 for RTD types, their associated temperature ranges, and the
analog input signal ranges that each 1746-NR8 channel supports. Each input
channel is individually configurable for a specific input device. Broken sensor
detection (open- or short-circuit) is provided for each input channel. In addition,
the module provides indication if the input signal is out-of-range.
The module contains a removable terminal block providing connection for any mix
of eight RTD sensors or resistance input devices. There are no output channels on
the module. Module configuration is done via the user program. There are no DIP
switches.
Channel Status LEDs
Channel status LEDs indicate the status for channels 0 through 7. Related error
information is contained in the channel status word. This includes conditions such
as:
• normal operation
• channel-related configuration errors
• open-circuit errors
• out-of-range errors
All channel errors are recoverable errors.
Module Status LED
The module status LED shows diagnostic or operating errors related to the module.
These non-recoverable errors may be detected during power-up or during
operation. 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 Rockwell Automation.
Publication 1746-IN007C-EN-P - December 2002
6 SLC 500™ RTD/Resistance Input Module
Channel Status
LEDs (Green)
Module Status
LED (Green)
Removable Terminal
Block
Cable Tie Slots
CHANNEL
STA TUS
MODULE
RTD / resistance
INPUT
0 4
1
2
3
Door Label
5
6
7
RTD 0
Sense 0
Return 0
RTD 1
Sense 1
Return 1
RTD 2
Sense 2
Return 2
RTD 3
Sense 3
Return 3
RTD 4
Sense 4
Return 4
RTD 6
Sense 5
Return 5
RTD 6
Sense 6
Return 6
RTD 7
Sense 7
Return 7
1746-NR8
Required Tools and Equipment
Have the following tools and equipment ready
• small blade screwdriver (0.100 inch slot width)
• RTD module (1746-NR8)
• RTD sensor or resistance input
• appropriate cable (if needed)
• programming equipment
Publication 1746-IN007C-EN-P - December 2002
SLC 500™ RTD/Resistance Input Module 7
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. Handle the module as stated below.
!
• Wear an approved wrist strap grounding device when handling the module.
• Touch a grounded object to rid yourself of electrostatic charge before
handling the module.
• Handle the module from the front, away from the backplane connector. Do
not touch backplane connector pins.
• Keep the module in its static-shield bag when not in use, or during
shipment.
Power Requirements
The RTD module receives its power through the SLC 500 chassis backplane from
the fixed or modular +5V dc/+24V dc chassis power supply. The maximum current
drawn by the module is shown in the table below.
5V dc Amps 24V dc Amps
0.100 0.055
When you are using a modular system configuration, add the values shown in the
table above to the requirements of all other modules in the SLC chassis to prevent
overloading the chassis power supply.
When you are using a fixed system controller, refer to the important note on page 8
about module compatibility in a 2-slot fixed expansion chassis.
Publication 1746-IN007C-EN-P - December 2002
8 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 module.
Fixed Expansion Chassis Considerations
IMPORTANT
For a complete listing of valid combinations using the RTD module in a 2-slot
expansion chassis with another SLC I/O or communication module, refer to the
table in the SLC 500 RTD/Resistance Input Module User Manual, publication
number 1746-UM003.
The 2-slot, SLC 500 fixed I/O expansion chassis (1746-A2)
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 using the RTD module in a 2-slot expansion
chassis with another SLC I/O or communication module, refer
to the table in the SLC 500™ RTD/Resistance Input Module
User Manual.
General Considerations
Most applications require installation in an industrial enclosure to reduce the effects
of electrical interference. RTD inputs are susceptible to electrical noises due to the
small amplitudes of their signal.
Group your modules to minimize adverse effects from radiated electrical noise and
heat. Consider the following conditions when selecting a slot for the RTD module.
Position the module:
• in a slot away from power lines, load lines and other sources of electrical
noise such as hard-contact switches, relays, and AC motor drives
• away from modules which generate significant radiated heat, such as the
32-point I/O modules
Publication 1746-IN007C-EN-P - December 2002
Loading...