Siemens SIMATIC ET 200AL System Manual page 123

Procedure
To replace a module, proceed as follows:
1. Disconnect the supply voltage to the module to be replaced.
2. Completely remove all cables connected to the module.
3. Completely remove the fixing screws of the module
4. Replace the module.
NOTE
"New" module
The removed module may only be replaced by a module of the same type.
5. Fasten the module with a torque of 1.2 Nm.
6. Connect all cables.
7. Turn the supply voltage on.
Pay attention to the slot number of the module
If you mix up the ET 200AL I/O modules when connecting them, this can cause personal
injury and damage to the machine.
The ET 200AL distributed I/O system cannot distinguish between modules of the same type
during the actual/target comparison.
We recommend that you clearly label the ET 200AL I/O modules with the slot number.
The figure below shows a recommendation for labeling the ET 200AL I/O modules with the
slot number.
①
Figure 12-1 Slot number
Result
The disconnected I/O module and all downstream I/O modules start up again by themselves.
Distributed I/O system
System Manual, 12/2023, A5E31861578-AL
WARNING
Recommendation for labeling the slot number
Maintenance
12.1 Replacing modules
123