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Figure 3-7
Contacting the shield at the point of entry to a cabinet
3.3.6.4
Special noise suppression measures
Connecting switched inductances to suppressors
Some inductive switching devices (for example relays) create interference voltages that are
a multiple of the connected operating voltage. The SIMATIC S7-300 /9/ and S7-400 /10/
system manuals contain suggestions on how to limit the interference voltages caused by
inductance by connecting them to suppressors.
Power supply for programming devices
It is advisable to include a power socket for programming devices in each cabinet. The
socket must be supplied by the same system to which the PE conductor for the cabinet is
connected.
Passive network components
System Manual, 02/2013, C79000-G8976-C282-01
3.3 Guidelines for setting up networked automation systems in buildings
Installing network components in cabinets
95
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