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P R O F I B U S P
O W E R
6.4
Redundant Operation
6.4.1
Redundancy Behavior
During redundant operation, the Gateway simulates PA slaves for the
DP-BUS. From the point of view of the DP bus, Redundancy Switchover
has no visible effect on the Master. All slaves remain in the cycle. This
Transparent Redundancy (TR) differs from normal Flying Redundancy
(FR) behavior, which allows slaves to drop out of the cycle for a defined
time.
The HD2-GTR-4PA supports all Masters that work on the Flying Redun-
dancy principle as well as all non-redundant Masters.
The BIS automatically detects whether the DP master is using a redun-
dancy concept. If the DP master is working according to the Flying Red-
undancy concept, the Gateway automatically adjusts itself accordingly.
No settings of any kind need to be made.
With Transparent Redundancy, exchange of user data remains intact. In
the worst case, only non-critical acyclic data exchange will drop out.
6.4.2
System Environment for Redundant Operation
In redundant operation, both BISs (Primary and Backup Gateway)
should be in cyclic data exchange. Assigning bus addresses to both Ga-
teways makes it easy to monitor both BISs with the Master, which de-
tects the failure of one of the two BISs and reports the relevant slave
address.
The PROFIBUS Power Hub provides redundant Coupling of PA seg-
ments in the following system environments:
•
with use of non-redundant Master and
•
in a Flying Redundancy system.
Non-redundant Masters do not see any effect on PA slaves from Red-
undancy Switchover. The Backup Gateway takes over communication
seamlessly. Both Gateways participate in general Token Ring operation:
Primary Gateway = PA Master Address 1, Backup Gateway = PA Master
Address 2. Participation in Token Ring operation thus allows use of
handhelds for diagnostic purposes.
The BIS must participate in cyclic data exchange.
Note
Subject to reasonable modifications due to technical advances.
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