Siemens SIMATIC CPU 410 System Manual page 241

● Violation of lower limit
The sent or received optical performance is low or too low.
● Violation of upper limit
The sent or received optical performance is high or too high.
● Functional error of the network component
The quality of the redundancy link between the CPUs (transmission distance including
synchronization modules and fiber-optic cables) is reduced so that transmission errors
are occurring frequently.
In redundant mode the OB82 is also called at Power Off/On or at a firmware update of the
partner CPU. This does not indicate any problem with the synchronization link but is instead
due to the fact that the synchronization modules are not emitting any light at this moment.
Fiber-optic interfaces of unused modules
Fiber-optic interfaces of unused modules must be blanked off during storage to protect the
optical equipment. The plugs are in the synchronization module when shipped.
NOTICE
Reduced optical performance due to dirt
Even small amounts of dirt in a fiber-optic interface adversely affect the quality of the signal
transmission. This can lead to synchronization losses during operation.
Protect the fiber-optic interfaces against dirt during storage and installation of the
synchronization modules.
Wiring and inserting the synchronization module
1. Remove the dummy plug of the synchronization module.
2. Fold back the clip completely against the synchronization module.
3. Insert the synchronization module into the IF1 interface of the first fault-tolerant CPU until
it snaps into place.
4. Insert the end of the fiber-optic cable into the synchronization module until it snaps into
place.
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
Synchronization modules
14.1 Synchronization modules for the CPU 410.
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