Shielded signal cables
• For safe and smooth operation of the system, the specied cables must be used. Please refer
to the chapter titled Connection.
• For digital signal transmission, the shield must have a conductive connection at both sides
of the housing.
Cable denitions
• Signal cables (example)
– Data cables (Ethernet, PROFIBUS, PROFINET, sensor cables, etc.)
– Digital inputs/outputs
– Emergency Stop cables
• Power cables (example)
– Supply voltage 1 x 230 V AC or 3 x 400 V AC
– Motor cables
Rules for routing cables
In order to maximize noise immunity for the complete system (controller, power section,
machine) the following EMC measures must be observed:
• A minimum distance of 200 mm is to be observed between the signal lines and power cables.
• If necessary, signal and load cables may cross one another (if possible, at an angle of 90°), but
must never be laid close or parallel to one another.
• Only use cables approved by Siemens for the signal lines from and to the NCU.
• Signal cables may not be routed close to strong external magnetic elds (e.g. motors and
transformers).
• If signal lines cannot be routed a sucient distance away from other cables, they must be
installed in grounded cable ducts (metal).
Note
For more specications regarding interference suppression measures and connection of
shielded cables, see
References
Conguration Manual, EMC Guidelines
Application planning
4.1 Secondary electrical conditions
NCU 7x0.3B PN
34 Equipment Manual, 10/2020, 6FC5397-1EP40-6BA1
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