Knowledge Base / Rockwell In-chassis / ControlLogix / MVI56 Series

"Invalid Input Size" when adding an Prosoft module to RSLogix 5000

Search KB


Confirm that the Comm Format parameter in the modules I/O configuration is set to Data - INT. The default setting for this parameter in RSLogix5000 is Data - DINT. This setting will generate the error message mentioned above.

If the incorrect comm format is set, the only way to correct this is to delete the module from the I/O configuration and add the module using the correct Comm Format.