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Synchronization modules
12.1
Synchronization modules for the CPU 410-5H
Function of the synchronization modules
Synchronization modules are used for communication between two redundant CPU 410-5H.
You require two synchronization modules per CPU, connected in pairs by fiber-optic cable.
The system supports hot-swapping of synchronization modules, and so allows you to
influence the repair response of the fault-tolerant systems and to control the failure of the
redundant connection without stopping the plant.
The diagnostics of synchronization modules is based on the known extended maintenance
concept of PROFINET IO.
If you remove a synchronization module in redundant system mode, there is a loss of
synchronization. The standby CPU switches to ERROR-SEARCH operating state for a few
minutes. If the new synchronization module is inserted and the redundant link is
reestablished during this time, the standby CPU switches to redundant system state,
otherwise it switches to STOP.
Once you have inserted the new synchronization module and reestablished the redundant
link, you must restart the standby CPU.
Distance between the S7–400H CPUs
Two types of synchronization module are available:
Order number
6ES7 960–1AA06–0XA0
6ES7 960–1AB06–0XA0
Long synchronization cables may increase cycle times. This extension can have the factor 2
- 5 with a cable length of 10 km.
Note
You must use 4 synchronization modules of the same type in a fault-tolerant system. You
can configure the synchronization modules as another type. For example, modules for a
distance of 10 meters between the CPUs can be configured as modules for a distance of 10
km between the CPUs, but all 4 modules can still be identical. Startup of the system is only
possible in this case if "Startup if preset configuration does not match actual configuration" is
configured.
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
Maximum distance between the CPUs
10 m
10 km
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