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The WAGO-I/O-SYSTEM 750 • 23

Power Supply

WAGO-I/O-SYSTEM 750

PROFIBUS

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 analog input modules

have each channel electrically isolated, please see catalog.

T 6,3 A

250 V

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 "Grounding Protecti"). Thus,

if a bus module comes loose from the node 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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Sharp DP-750 Wartungshandbuch Seite 23