System Redundancy - Siemens SIMOCODE pro Function Manual

2.2.13

System redundancy

System redundancy with H CPUs
The redundant-system connection via PROFINET provides a communication link
(Application Relation) between each SIMOCODE pro V PN (GP) IO device and each of the
two H CPUs. The communication link can be set up by means of a freely selectable
topological connection, i.e. the topology of a plant does not indicate whether or not
SIMOCODE pro PN (GP) is interfaced via a redundant-system connection. In addition to
operation as a redundant system, the SIMOCODE pro V PN (GP) can also be operated on H
CPUs as a so-called "non-redundant IO device". In this mode, only one of the two CPUs
establishes a communication link to the IO device. The disadvantage of operating an IO
device as a non-redundant device is that it will fail in the event of failure of the CPU to which
it is linked.
Note
Firmware version of the H CPU
System redundancy is supported with H CPU firmware version V6.0.3 and higher.
SIMOCODE pro V PN with system redundancy
The diagram below illustrates a configuration with two redundant-system
SIMOCODE pro V PN (GP) basic units. This topology offers particular advantages. The
entire system can remain in operation if a line break occurs anywhere in the configuration.
One of the two SIMOCODE pro V PN (GP) communication links always remains operational.
The SIMOCODE pro V PN units then function like non-redundant devices.
Figure 2-17
①
S7-400H system
②
SIMOCODE pro V PN (GP) as a redundant IO device
SIMOCODE pro - Communication
Function Manual, 11/2018, A5E40508495002A/RS-AC/003
S7-400 H system with redundant I/Os
Communication
2.2 PROFINET communication
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