Siemens SINUMERIK 840D sl Equipment Manual page 34

Application planning
4.1 Secondary electrical conditions
Shielded signal cables
• For safe and smooth operation of the system, the specified 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 definitions
• 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 fields (e.g. motors and
transformers).
• If signal lines cannot be routed a sufficient distance away from other cables, they must be
installed in grounded cable ducts (metal).
Note
For more specifications regarding interference suppression measures and connection of
shielded cables, see
References
Configuration Manual, EMC Guidelines
34
Equipment Manual, 10/2020, 6FC5397-1EP40-6BA1
NCU 7x0.3B PN