Rockwell Automation 1763-L16xxx MicroLogix 1100 Programmable Controllers Installation Instructions - Manual (Page 21)

21
Publication 1763-IN001B-EN-P - September 2007
Several specific steps can be taken to help reduce the effects of environmental
noise on analog signals:
• install the MicroLogix 1100 system in a properly rated (NEMA) enclosure.
Make sure that the MicroLogix 1100 system 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.
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