Siemens SIMATIC S5 Manual page 272

Start-Up
8.1.6 Checking the Wiring
Check all cabling
- Make sure that the control cable and the power cable are
sufficiently far apart and without kinks.
- Make sure that the cables to and from the controller are shielded
over their entire length, and that the cable shields are grounded
at both ends.
One important point is the laying of the ground wires, as insufficient
cross-sections, ground loops or failure to connect the ground may
result in malfunctions. Locating and eliminating such problems can be
costly and time-consuming.
Make sure that the ground wires have sufficient cross-sectional area
and are properly laid and connected.
If you are using a 5 V encoder, check to make sure that the inverse
signal leads are shielded.
Make sure that the leads for the n
twisted.
Check the following cables for short-circuits and wirebreaks and
make sure that the pin assignments are as described in the section
dealing with the hardware (Section 2):
- Encoder cable (ENCODER)
- Setpoint cable (ANALOG OUT)
- Digital cable
- FUM signal wired?
8-6
and M signals are shielded and
set
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EWA 4NEB 812 6057-02