Cause

EPLAN has determined an incorrect assignment of a PLC module with regard to the used rack. Which module is affected and how the assignment has to be corrected is specified in the placeholder "<x>" of the message.

Solution

1. Locate the PLC box representing the module in the schematic using the Go to (graphic) functionality that is provided by the popup menu of the Message management dialog.
2. Open the property dialog of the PLC box.
3. Bring the PLC structure data tab to the front.
4. Correct the value or the setting of the property specified in the message text in accordance with the default (for example for the property Rack, Module is placed on rack ID, Position (slot / module) or CPU).
5. Click [OK].
6. Then start a new check run.