Removing And Inserting When Voltage Is Applied - Siemens SIMATIC S7-400H Manual

Caution
!
The synchronization module contains a laser system and is classified as
"CLASS 1 LASER PRODUCT" according to IEC 60825-1. Please read the
operating instructions thoroughly for the right use of this module and save it as
reference. If you encounter problems with this model, please contact the Siemens
Service Partner close to you. The casing must remain closed to avoid direct
contact with the laser ray.

Removing and Inserting when Voltage is Applied

You have to switch off the power supply when removing or inserting a
synchronization module in an (PS). The synchronization module has a second
front cover which you have to unscrew before removing the module. If you
unscrew the front cover, the synchronization module will be disconnected from the
voltage and you can remove it without any damage. After inserting the
synchronization module, a connection will not be made to the voltage until you
have screwed back the the front cover.
Note
The reserved CPU will go to STOP when you unscrew the synchronization module
or the fiber optic cable in the redundant mode of the system. The master CPU
remains in RUN.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
CLASS 1 LASER PRODUCT
CLASS 1 LASER PRODUCT
TO EN 60825
Synchronization Module
12-3