26 • The WAGO-I/O-SYSTEM 750
Power Supply
WAGO-I/O-SYSTEM 750
DeviceNet
2.7 Power Supply
2.7.1 Isolation
Within the fieldbus node, there are three electrically isolated potentials.
• Operational voltage for the fieldbus interface.
• Electronics of the ECO coupler and the bus modules (internal bus).
• All bus modules have an electrical isolation between the electronics (inter-
nal bus, logic) and the field electronics. Some analog input modules have
each channel electrically isolated, please see catalog.
T 6,3 A
250 V
DC
DC
Potential of the system supply
Potential
Fieldbus interface
Potentials
in the field level
per module
per channel
Electrical isolation
to the field level
Fieldbus
Interface
Elektronic
Fig. 2-10: Isolation g0xxx11e
Attention
The ground wire connection must be present in each group. In order that all
protective conductor functions are maintained under all circumstances, it is
recommended that a ground wire be connected at the beginning and end of a
potential group. (ring format, please see chapter "2.8.3"). Thus, if a bus mod-
ule comes loose from a composite during servicing, then the protective con-
ductor 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 eliminated for the potential group.
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