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Application planning
5.1 Supplementary 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, PROFINET, etc.)
– Digital inputs/outputs
– Emergency Stop cables
● Power cables (example)
– Supply voltage 1 x 230 VAC or 3 x 400 VAC
– Motor cables
Rules for routing cables
In order to maximize noise immunity for the complete system (control, power unit, 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 to and from the MCU.
● 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).
Further information
You can find further information on interference suppression measures and the connection of
shielded cables here:
● Configuration Manual, EMC Guidelines
5.1.3
EMC limit values in South Korea
36
Equipment Manual, 09/2019, A5E47437728B AB
MCU 1720
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