Siemens S7-400 installation manual Replacing Interface Modules, Hot--swapping Modules

Maintenance

7.6Replacing Interface Modules

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.

Hot--swapping Modules

Observe the following warning when fitting and removing the interface modules and the corresponding connecting cables.

!Caution

Data can be lost or corrupted.

If you remove or insert the interface modules and/or corresponding connecting cables with power applied, data may be lost or corrupted.

Switch off the power supply modules of the CR and ERs on which you are working before carrying out any actions.

Removing Modules / Exchanging Cables

1.If you wish to back up your data in the CPU, you can do this with a backup battery or via an external battery supply at the CPU (see the CPU Data Reference Manual, Chapter 1).

2.Set the CPU mode switch to STOP.

3.Set the standby switches of both power supply modules (in the CR and the ER) to (0 V output voltages).

4.Remove the cover.

5.Disconnect the connecting cables.

6.Disconnect the terminator, if applicable.

7.Loosen the mounting screws of the module.

8.Swing the module out.

Automation System S7-400	Hardware and Installation	7-11
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