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It is permissible to cluster the operator control components regarding connection/potential
bonding.
Example: The control panel on the swivel arm.
It is sufficient in this instance to connect the ground connections of, for example, the PCU,
TCU, and operator panel front using a cable and to route a shared grounding conductor to the
central ground connection in the control cabinet.
Additional references
EMC Design Guidelines
1.2.1.3
EMC compatibility
In addition to the protective grounding of system components, special precautions must be
taken to guarantee safe, trouble-free operation of the system. These measures include
shielded signal lines, special equipotential bonding connections, and isolation and shielding
measures.
Shielded signal cables
● For safe and fault-free operation of the system, the specified cables must be used.
● For digital signal transmission, the shield must have a conductive connection at both sides
of the housing.
Cable definition
Definition:
● Signal cables (example)
– Data cables (Ethernet, PROFIBUS, sensor cables, etc.)
– Digital I/Os
– Cables for safety functions (emergency stop, enabling)
● Power cables (example)
– Low-voltage supply lines (230 VAC, +24 VDC, etc.)
– Motor cables
Rules for routing cables
In order to achieve the greatest possible EMC compatibility for the complete system (control,
power unit, machine), the following EMC measures must be carefully observed:
● If necessary, signal and power 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 Control Unit.
● Signal cables must not be routed close to strong external magnetic fields (e.g. motors and
transformers).
Operator panel front: OP 010
Manual, 07/2018, A5E36371538B
General information and networking
1.2 Application planning
13
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