Siemens S7-400 Installation Manual page 178

Maintenance
Removing the Front Connector Coding Key
Before fitting the front connector, you must remove (break off) the front part of the
coding key, because this part is already fitted in the wired front connector.
Caution
!
The module can be damaged.
If, for example, you insert a front connector of a digital module in an analog
module, the module may be damaged.
Only operate modules with their complete front connector coding key.
Installing a New Module
1. Attach the new module of the same type at the appropriate slot and swing it
downwards.
2. Screw the module on with both mounting screws.
3. Fit the front connector.
4. If you have set the CPU to STOP, you must now set it to RUN again.
5. After fitting, each programmable module will be reinitialized by the CPU with
parameters.
How the S7-400 Behaves after Exchanging Modules
If an error occurs after replacing a module, you can read out the cause of the error
from the diagnostic buffer.
Exchanging the Front Connector
1. Switch off all load power supplies for the module.
2. Loosen the screw of the front connector and pull it off.
3. Remove the labels from the front connector and insert them into the new front
connector.
4. Wire the new front connector.
5. Insert the front connector in the module.
6. Screw the front connector on.
7. Switch on the load voltage.
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S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04