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P R O F I B U S P
O W E R
8
Basic Principles
8.1
Redundancy Concepts
8.1.1
Overview
Two redundancy concepts have become established on the market:
Flying Redundancy and System Redundancy. These redundancy im-
plementations are described below.
8.1.2
Flying Redundancy
Under this concept, both slave and master instances are connected to
the same physical bus so there is only one DP cycle. The Address of the
Primary Slave incremented by 64 is assigned to the Backup Slave:
•
Figure 8.1: Flying Redundancy
This concept involves 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 by means of so-called Media Red-
undancy. As the following topology illustrates, a fault is only relevant to
the corresponding bus:
Subject to reasonable modifications due to technical advances.
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Basic Principles
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