CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
201
Synchronization modules
12
12.1
Synchronization modules for the CPU 410-5H
Function of the synchronization modules
Synchronization modules are used synchronization link 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 process for synchronization modules is based in parts on the maintenance
concept familiar from PROFINET IO. As of firmware version 8.1 of the CPU, maintenance
required is no longer reported.
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 then switches to redundant system mode;
otherwise it switches to STOP.
Once you have inserted the new synchronization module and reestablished the redundant
link, you must restart the standby CPU, if necessary.
Distance between the S7–400H CPUs
The following types of synchronization modules are available:
Article No.
Maximum distance between the CPUs
6ES7 960–1AA06–0XA0
10 m
6ES7 960–1AB06–0XA0
10 km
The synchronization set with article number 6ES7 656-7XX30-0XE0 includes 4
synchronization modules 6ES7 960–1AA06–0XA0 (10m) and 2 fiber-optic cables each 1m
long.
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.