Siemens S7-400 installation manual Replacing Digital or Analog Modules, Installing a Module

Maintenance

7.4Replacing Digital or Analog 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.

Installing a Module

1.You can replace analog and digital modules in RUN mode. You must have taken the appropriate action in your STEP 7 program to ensure correct responses from your system.

If you are not sure whether your program will react correctly, set the CPU mode switch to STOP.

!Warning

Improper handling of the front connectors can result in injury and damage.

If the front connector is removed and inserted during operation, hazardous voltages of >25 VAC or >60 VDC may be present at the pins of the module.

When such voltages are present at the front connector, modules with power applied may only be replaced by electrical specialists or trained personnel in such a way that the pins of the module are not touched.

2.Loosen the mounting screw of the front connector and pull it off.

3.Loosen the mounting screws of the module.

4.Swing the module out.

Note

In order that the removal and insertion of digital or analog modules can be detected by the CPU, a minimum time of two seconds must elapse between removal and insertion.

Automation System S7-400	Hardware and Installation	7-7
A5E00850741-01