Rockwell Automation 1746-FIO4V SLC 500 Fast Analog I/O/ User Manual - Manual (Page 17)

Publication 1746-UM009B-EN-P - September 2007
Install and Wire the Modules 17
Ground the Cable
Signal cable such as Belden cable #8761 (or equivalent) has two signal
wires (black and clear), one drain wire, and a foil shield. The drain
wire and foil shield must be grounded at only one end of the cable,
not at both ends.
Typical Signal Cable
Determine Cable Length
When you determine the length of cable required to connect an I/O
device, remember to include additional length to route the drain wire
and foil shield to earth ground. Route your cable long enough to
avoid areas of high radiated electrical noise, but short enough to avoid
signal attenuation.
IMPORTANT
Ground the cable shield at one end having a good earth-ground
connection, such as at an I/O chassis mounting bolt or nearest
ground bus in the I/O enclosure. Make this connection as short
as possible. Do not ground the cable at the module’s terminal
block.
Insulation
Shrink Wrap
Clear Wire Drain Wire
Black Wire
Foil Shield