Rockwell Automation 1746-XXXX SLC 500 4-Channel Analog I/O Modules Installation Instructions - Manual (Page 17)

SLC™ 500 4-Channel Analog I/O Modules 17
Publication 1746-IN008C-EN-P - May 2004
Minimizing Electrical Noise on Analog Modules
Inputs on analog modules employ digital high frequency filters that significantly
reduce the effects of electrical noise on input signals. However, because of the
variety of applications and environments where analog modules are installed and
operating, it is impossible to ensure that all environmental noise will be removed
by the input filters.
Although it is not the purpose of this installation instruction to address SLC 500
system procedures, several specific steps can be taken to help reduce the effects of
environmental noise on analog signals:
•
Install the SLC 500 system in a properly rated (i.e., NEMA) enclosure. Make
sure that the SLC 500 system is properly grounded.
•
Use Belden cable #8761 for wiring the analog modules making sure that the
drain wire and foil shield are properly earth grounded.
•
Route the Belden cable separate from any other wiring. Additional noise
immunity can be obtained by routing the cables in grounded conduit.
•
Group analog and low voltage dc modules away from ac I/O or high voltage
dc modules.
A system may malfunction due to a change in the operating environment after a
period of time. Periodically check system operation, particularly when new
machinery or other noise sources are installed near the SLC 500 system. For further
details on system installation and start-up refer to:
•
SLC 500 Modular Hardware Style User Manual, publication 1747-UM011
•
SLC 500 Fixed Hardware Style User Manual, publication 1747-6.21
•
Safety Guidelines for the Application, Installation Maintenance of Solid State
Control, publication SGI-1.1.
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