Siemens S7-300 - Equipotential Bonding

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
12-12 A5E00203919-01
The figure below shows some options for mounting shielded cables, using cable
clamps.
Figure 12-4 Mounting cable shielding
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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.
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Cable shieldin
g
is not suitable for equipotential bondin
g
. Alwa
y
s use the prescribed
cables (e.g. with a cross-section of 16 mm
2
). When installing MPI/DP networks,
provide a sufficient conductor cross-section. Otherwise, interface hardware might
get damaged or even be destroyed.
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