Installing the extension module at the CX20x0 system

	Damage to the contacts Incorrect installation may result in damage to the contacts of the fieldbus modules. The fieldbus modules may only be attached on the left-hand side of the basic CPU module.

A maximum of four fieldbus modules can be attached to the basic CPU module via the internal PCI Express bus. In delivery state the fieldbus module is equipped with a protective cap for the bus connector.
Before continuing, connect the fieldbus module to the basic CPU module.

Prerequisites for this step:

Exit the software and shut down the CX20x0 hardware configuration.
Switch off the power supply.

Install the fieldbus module as follows:

1. Put a screwdriver into the recess on the short side of the protective cap and lever it off.
Installing the extension module at the CX20x0 system 2:

2. Remove the protective cap to expose the bus connector.

3. Insert the fieldbus module on the left-hand side of the basic CPU module.
Installing the extension module at the CX20x0 system 3:

4. The module clicks into the basic CPU module.
Installing the extension module at the CX20x0 system 4:

The fieldbus module has been installed successfully, if the individual modules were connected straight and flush.
Next, you can install the bar clips, thereby reinforcing interlocking of the modules.