Ident number

Each DP slave device and each DPM1 must have an individual ID number. The ID number is unique for each DP device. It is designed such that a DP master device can identify connected devices without significant protocol overhead. The DPM1 compares the ID numbers of the connected DP devices with the ID numbers in the configuration data specified by DPM2. The transfer of user data only starts if the correct device types are connected to the bus at the correct station addresses. This provides protection from configuration errors. Manufacturer-specific identification numbers are issued by the PROFIBUS User Organization (PNO). The PNO administers the identification numbers along with the basic device data (GSD).