beautypg.com

Siemens S5-135U/155U User Manual

Page 55

background image

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