Siemens SIMATIC S7-200 System Manual page 33

Tip
Using DIN rail stops could be helpful if your S7-200 is in an environment with high vibration
potential or if the S7-200 has been installed vertically.
If your system is in a high-vibration environment, then panel-mounting the S7-200 will provide a
greater level of vibration protection.
Removing a CPU or Expansion Module
To remove an S7-200 CPU or expansion module, follow these steps:
1. Remove power from the S7-200.
2. Disconnect all the wiring and cabling that is attached to the module. Most S7-200 CPU and
expansion modules have removable connectors to make this job easier.
3. If you have expansion modules connected to the unit that you are removing, open the
access cover door and disconnect the expansion module ribbon cable from the adjacent
modules.
4. Unscrew the mounting screws or snap open the DIN clip.
5. Remove the module.
Removing and Reinstalling the Terminal Block Connector
Most S7-200 modules have removable connectors to make installing and replacing the module
easy. Refer to Appendix A to determine whether your S7-200 module has removable connectors.
You can order an optional fan-out connector for modules that do not have removable connectors.
See Appendix E for order numbers.
To Remove the Connector
1. Open the connector door to gain access to the connector.
2. Insert a small screwdriver in the notch in the middle of the connector.
3. Remove the terminal connector by prying the screwdriver away from the S7-200 housing.
See Figure 3-2.
Figure 3-2 Removing the Connector
To Reinstall the Connector
1. Open the connector door.
2. Align the connector with the pins on the unit and align the wiring edge of the connector
inside the rim of the connector base.
3. Press down firmly to rotate the connector until it snaps into place. Check carefully to ensure
that the connector is properly aligned and fully engaged.
Installing the S7-200 Chapter 3
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