Potential Bonding; Principle When Connecting Components; Potential Bonding Rail - Siemens SIMATIC FM 458-1 DP User Manual

Assembly guidelines

5.1.7 Potential bonding

5.1.8 Principle when connecting components

5.1.9 Potential bonding rail

5-6
The following should be carefully observed when mounting/installing in a
cabinet:
For incoming shielded cables (analog and binary signals), the shield must
be connected to the shield rail where the cable enters the cabinet. The
cable must then still be shielded up to the terminal module/board. Shields
are not connected to the terminal modules/boards.
For additional information refer to the following documentation "S7-400
and M7-400 Programmable Controllers Hardware and Installation",
Installation Manual (Order No. C79000-G7000-C14).
In order to ensure disturbance-free operation, the components which are
connected and communicate with one another may not be at different
potentials. This means that all components must be connected with one
another through potential bonding cables.
For additional information refer to Installation Manual "S7-400 and
M7-400 Programmable Controllers Hardware and Installation".
All of the components (subracks, power supplies etc.), which are
connected using signal cables, must also be connected with potential
bonding cables (exception: Components with fiber-optic cable
connections).
For additional information refer to Installation Manual „S7-400 and
M7-400 Programmable Controllers Hardware and Installation".
Subrack
A
There should be a potential bonding and grounding rail below the
subrack.
All of the internal and external components must be connected to this
potential bonding- and grounding rail.
The shields of all cables must be connected to this grounding rail.
For additional information refer to Installation Manual „S7-400 and
M7-400 Programmable Controllers Hardware and Installation".
Subrack
B
Potential bonding
EBG
Application Module FM 458-1 DP - User Manual
A5E01078222-02
Subrack
C
conductor
Edition 03.2009