Rockwell Automation 1746-FIO4V SLC 500 Fast Analog I/O/ User Manual - Manual (Page 18)

Publication 1746-UM009B-EN-P - September 2007
18 Install and Wire the Modules
Minimize Electrical Noise
Interference Because high-speed analog signals are particularly vulnerable to
electrical noise, take precautions when routing your signal cables. To
help reduce the effects of electrical noise on analog signals, we
recommend that you do the following:
• Install the SLC 500 system in a NEMA rated enclosure.
• Make sure that the SLC 500 system is properly grounded.
• Use Belden cable #8761 (or equivalent) for signal wiring.
• Ground the cable properly.
• Route signal cables away from other wiring or in grounded
conduit.
• Group these modules away from ac or high-voltage dc modules.
We recommend re-checking system operation after installing new
machinery or other sources of electrical noise near the system.
For additional information on this subject, refer to Industrial
Automation Wiring and Grounding Guidelines, publication 1770-4.1.
Wire the Module Follow this procedure when wiring your modules.
1. Strip about 7.6 cm (3 in.) of casing to expose the wires at each
end of the cable.
2. Twist the drain wire and foil shield together and bend them
away from the cable at the grounded end of the cable.
ATTENTION
Before wiring a module, disconnect power from the SLC 500
system and from any other source to the module.
Black Wire
Casing Clear Wire Shrink Wrap
Grounded End
Ungrounded End
Black Wire
Clear Wire Shrink Wrap
Casing
Twisted Foil Shield and Drain Wire