Siemens S7-400 installation manual Inserting an Interface Submodule in a CPU

Maintenance

You can replace an interface submodule with another one without having to remove the associated CPU from the rack. Follow the steps outlined below:

1.Switch the CPU to STOP (not the synchronization module of a redundant system).

2.Switch off the power supply (not the synchronization module of a redundant system).

3.Loosen the screws of the sub-D-connector and remove all connectors.

4.Loosen the two captive slot-head screws which secure the front plate of the interface submodule to the left frame of the card slot so that the screws can be removed by 6 mm.

5.Carefully remove the interface submodule from the guide support of the card slot (see figure 7-1). Hold the interface module on the long sides of the front plate.

Guide

rails

Figure 7-1 Inserting an Interface Submodule in a CPU

Installing Interface Submodules

In order to install an interface submodule, proceed in reverse order. For further information, see section 6.10 ”Installing Interface Submodules”.

7-20	Automation System S7-400	Hardware and Installation
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