Siemens SIMATIC S7-400H System Manual page 344

Synchronization modules
18.1 Synchronization modules for S7–400H
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
4. Insert the end of the fiber-optic cable into the synchronization module until it snaps into
5. Repeat steps 1 to 4 for the second synchronization module.
6. Repeat the process for the second fault-tolerant CPU.
Removing the synchronization module
1. Slightly press the release of the fiber-optic cable and remove it from the synchronization
2. Fold the clip of the synchronization module to the front and remove the synchronization
3. Place the dummy plug on the synchronization module.
4. Repeat this procedure for all interfaces and both fault-tolerant CPUs.
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it snaps into place.
place.
Connect the IF1 interface of the first CPU with the IF1 interface of the second CPU and
the IF2 interface of the first CPU with the IF2 interface of the second CPU.
NOTICE
Wiring synchronization modules crosswise
If you wire synchronization modules crosswise, i.e. the IF1 interface of the first CPU with
the IF2 interface of the second CPU and vice versa, the two CPUs take over the master
role and the system will now function properly. The LEDs IFM 1 and IFM 2 are lit on
both CPUs.
Make sure that you connect the IF1 interface of the first CPU with the IF1 interface of
the second CPU and the IF2 interface of the first CPU with the IF2 interface of the
second CPU.
module.
module from the fault-tolerant CPU interface.
System Manual, 03/2012, A5E00267695-11
S7-400H