Power Supply - WAGO 750-306 Technical Description

22 • The WAGO-I/O-SYSTEM 750

Power Supply

2.6 Power Supply
2.6.1 Isolation
Within the fieldbus node, there are three electrically isolated potentials.
• Operational voltage for the fieldbus interface.
• Electronics of the couplers / controllers and the bus modules (internal bus).
• All bus modules have an electrical isolation between the electronics (internal bus, logic) and
the field electronics. Some analogue input modules have each channel electrically isolated,
please see catalogue.
Fig. 2-10: Isolation
Attention
The ground wire connection must be existent in each group. In order that all
protective conductor functions are maintained under all circumstances, it is
sensible to lay the connection at the beginning and end of a potential group.
(ring format, please see chapter "2.7.3"). Thus, if a bus module comes loose
from a composite during servicing, then the protective conductor connection
is still guaranteed for all connected field devices.
When using a joint power supply unit for the 24 V system supply and the
24 V field supply, the electrical isolation between the internal bus and the
field level is disregarded for the potential group.
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WAGO-I/O-SYSTEM 750
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