26 • The WAGO-I/O-SYSTEM 750
Power Supply
WAGO-I/O-SYSTEM 750
Linux Fieldbus Coupler
2.7 Power Supply
2.7.1 Isolation
Within the field bus node, there are three electrically isolated potentials.
• Operational voltage for the field bus 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 digital and analog input
modules have each channel electrically isolated, please see catalog.
Fig. 2-10: Isolation g0xxx01e
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 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 eliminated for the potential group.
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