WAGO Modular IO System INTERBUS S Manuel de service télécharger pdf (Page 29)

Isolation • 29

WAGO DIN Rail

WAGO-I/O-SYSTEM 750

INTERBUS

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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WAGO Modular IO System INTERBUS S Manuel de service Page 29