Siemens S5-135U/155U - Manual (Page 196)

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System Manual
C79000-G8576-C199-06
5.5.2 Installation and Startup
!
Caution
Switch off the power supply before removing or inserting the module.
Proceed as follows to insert the CPU in the central controller:
Step Action
1 Release the upper locking bar of the central controller and ensure
that the locking pin for the module is correctly positioned with the
slot-head horizontal.
2 Select the correct slot (based on the labelling of the locking bar).
Insert the CPUs in the S5-135U/155U from slot 11.
3 Push the module evenly into the guide rail until the lever over the
locking pin is horizontal.
4 Press the locking pin inwards on the bottom of the module and
rotate it 90
o clockwise.
5 Secure the upper locking bar.
Note
If you install the CPU 928 -3UA21 as the replacement for a double-width
CPU, you must cover the slot which has been freed up with a blanking plate.
Proceed as follows to remove the CPU:
Step Action
1 Release the upper locking bar of the central controller.
2 Release the locking pin of the module.
3 Press the release lever downwards and pull the module forwards
and out of the central controller.
Removing and
Inserting the
Module
Insertion
Removal
CPUs, Memory Cards, Memory Submodules, Interface Submodules