Wiring
4-3
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
In the case of ... You must remember ...
Buildings External lightning protection Lightning protection
24V DC power supply
cables, signal cables
Internal lightning protection
measures (e.g.
lightning conductors)
24V supply Safety extra-low voltage with safe electrical isolation (SELV)
Protection from external electrical influences
The following table shows what you have to look out for to ensure protection
against electrical influences or faults.
In the case of ... You must ensure that ...
All systems in which the
modules are integrated
... The system is connected to the protective conductor so
that electromagnetic interference can be discharged.
Connecting, signal and bus
lines
... The cable has been routed and installed correctly.
Signal and bus lines ... Line or conductor strand breaks do not lead to
undefined system states.
Braided screen of the PROFIBUS cable
The braided screen of the PROFIBUS cable must be connected to a grounded
shield bus.
Affix the braided screen with metal cable clips.
The clip must cover a large portion of the screen and provide good contact.
Connect the screen to a shield bus directly after the point where the cable
enters the cabinet.
Cabinet
Figure 4-1 Braided screen of the PROFIBUS cable on the grounded shield bus
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