Maintenance
7-8 AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
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. Attachthe new module of the same type at the appropriate slot and swing it
downwards.
2. Screwthe module on with both mounting screws.
3. Fitthe front connector.
4. Ifyou have set the CPU to STOP, you must now set it to RUN again.
5. Afterfitting, 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. Switchoff all load power supplies for the module.
2. Loosenthe screw of the front connector and pull it off.
3. Removethe labels from the front connector and insert them into the new front
connector.
4. Wirethe new front connector.
5. Insertthe front connector in the module.
6. Screwthe front connector on.
7. Switchon the load voltage.