Siemens S5-135U/155U System Manual page 55

With distributed interfacing (IM 304/IM 314 and IM 301/IM 310), ensure
that the VDE specifications for laying the protective ground are complied
with; distributed interfacing is non-floating.
The measures described above are shown in the following figure. If the
permissible potential difference between ground points can be exceeded, you
must install an equipotential bonding conductor (cross-section
copper).
CC
< 7 V
Figure 3-13 Shielding and Grounding the Connecting Cable
Special Features With distributed interfacing, you must use the prefabricated connecting
cables. You may have excess lengths of up to 100 m when installing the
connecting cable. These excess lengths must be bifilar-wound and deposited
at a point which is protected from electromagnetic interference.
System Manual
C79000-G8576-C199-06
IM 304
Installation Guidelines
16 mm
EU
IM 314
Shield/Protective
Conductor Bar
2
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