Siemens SIMATIC PCS 7 - Page 56

Service and maintenance of SIMATIC PDM
6.3 Managing device descriptions in the project
Compendium Part D - Operation and Maintenance (V9.0)
56 Operating Manual, 02/2018, A5E43228948-AA
Example for the list of devices integrated in the device catalog
Please be aware that your project may contain a device type which has different SW/FW
revisions. The EDD version must always match an SW/FW revision of the device. If an
incorrect EDD is assigned, PDM will detect the deviation and communication with the device
will not be established. As a user you will receive a message from PDM stating which device
it expects and which one it has detected during device identification.