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6 replacing interface modules – Siemens Automation System S7-400 User Manual

Page 159

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Maintenance

7-11

Automation System S7-400 Hardware and Installation

A5E00850741-01

7.6

Replacing 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.