Siemens S5-135U/155U - Manual (Page 55)

3-29
System Manual
C79000-G8576-C199-06
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
w 16 mm 2 of
copper).
Shield/Protective
Conductor Bar
< 7 V
CC EU
IM 304 IM 314
Figure 3-13 Shielding and Grounding the Connecting Cable
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. Special Features
Installation Guidelines