Basic Redundancy Concepts - Pepperl+Fuchs FieldConnex Segment Coupler 3 Manual

Profibus power hub

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PROFIBUS Power Hub Segment Coupler 3 (SK3)

Basic Redundancy Concepts

The following redundancy concepts have become established on the market: Flying

redundancy and system redundancy. These redundancy implementations are described in the

following sections.

Flying Redundancy

This concept connects both slave and master instances to the same physical bus, so only

1 PROFIBUS DP cycle exists. The address of the primary slave incremented by 64 is assigned

to the backup slave:

Figure 8.1

The concept has the disadvantage that in the event of a fault on the bus, all communication is

interrupted. If redundancy link modules (RLM) are used, this can be avoided through socalled

media redundancy. As the following topology illustrates, a fault is only relevant to the

corresponding bus:

Flying redundancy

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Sk3 Fieldconnex hd2-gtr-4pa