Appendix
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
11-13
Figure 11-4 Mounting cable shielding
11.2.6 Equipotential bonding
Potential differences
Potential differences can occur between separate system elements. This can result
in high equipotential currents, e.g. if the cable shielding is terminated at both ends
and grounded to different system components.
The cause of potential difference can be differences in the power supplies.
Warning
Cable shielding is not suitable for equipotential bonding. Always use the prescribed
cables (e.g. with a cross-section of 16mm
2
). When installing MPI/DP networks,
provide a sufficient conductor cross-section. Otherwise, interface hardware might
get damaged or even be destroyed.
Equipotential conductor
To reduce potential differences and ensure proper functioning of your electronic
equipment, you must install equipotential conductors.
Note the following points on the use of equipotential conductors:
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