Allen-Bradley SLC 500 1746-NI4 Installation Instruction page 14

14 SLC 500™ Analog I/O Modules
Grounding Your Cable
Belden cable #8761 has two signal wires (black and clear), one drain wire and a
foil shield. Refer to illustration below for Belden cable #8761. The drain wire
and foil shield must be grounded at one end of the cable. Do not earth ground the
drain wire and foil shield at both ends of the cable.
Input Channel - Use a chassis mounting tab as a ground for the drain wire and
foil shield.
Output Channel - Ground the drain wire and foil shield at the analog load.
IMPORTANT
Belden Cable #8761
Determining the Cable Length
Determine the length of cable you will need to connect a channel to its input or
output device. Remember to leave additional length to route the drain wire and
foil shield for earth grounding.
Publication 1746-IN008A-US-P
If you cannot ground the output channel at the load, ground the
drain wire and foil shield at the chassis mounting tab. Do not
connect the foil shield or drain wire to the analog terminal
block. They must be connected to an earth ground, which is
not provided at the analog module.
Foil Shield
Clear Wire
Black Wire
Drain Wire