Siemens Automation System S7-400 - Manual (Page 153)

Maintenance
7-5
Automation System S7-400 Hardware and Installation
A5E00850741-01
7.3 Replacing CPUs
Slot Numbering
If you have provided the modules in your system with slot numbering, you must
remove the number from the old module when replacing it and apply the number to
the new module.
Saving the Data
Save the user program including configuration data.
Removing the Module
1. Set the CPU mode switch to STOP.
2. Set the standby switch of the power supply module to (0 V output voltages).
3. Remove the cover of the CPU.
4. Disconnect the MPI connector, if applicable.
5. Disconnect the connector at the EXT. BATT. socket, if applicable.
6. Remove the memory card.
7. Loosen the mounting screws of the module.
8. Swing the module out.