Rockwell Automation Publication 2080-UM002N-EN-E - November 2022 51
Chapter 4 Wire Your Controller
Several specific steps can be taken to help reduce the effects of environmental noise on
analog signals:
• Install the Micro800 system in a properly rated enclosure, for example, NEMA. Make sure
that the shield is properly grounded.
• Use Belden cable #8761 for wiring the analog channels, making sure that the drain wire
and foil shield are properly earth grounded.
• Route the Belden cable separately from any AC wiring. Additional noise immunity can be
obtained by routing the cables in grounded conduit.
Grounding Your Analog Cable
Use shielded communication cable (Belden #8761). The Belden cable has two signal wires
(black and clear), one drain wire, and a foil shield. The drain wire and foil shield must be
grounded at one end of the cable.
Wiring Examples
Examples of sink/source, input/output wiring are shown below.
IMPORTANT Do not ground the drain wire and foil shield at both ends of the cable.
Foil shield
Black wire
Drain wire
Clear wire
Insulation
D
DC COM
OUT
+V DC
S
G
+
–
24V supply
Logic side
User side
Load
Fuse
Sink output wiring example
Micro800 Sink output
Sink input wiring example
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