WAGO-I/O-SYSTEM 750
System Description
23
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
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3.6
Power Supply
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3.6.1
Isolation
Within the fieldbus node, there are three electrically isolated potentials:
•
electrically isolated fieldbus interface via transformer
•
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.
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Figure 3: Isolation for Standard Couplers/Controllers and extended ECO Couplers
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Note
Ensure protective conductor function is present (via ring feeding if
required)!
Pay attention, that 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 the end of a potential group (ring format, please see chapter
“Grounding” > “Grounding Protection”, Ring Feeding). 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 you use 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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