As specified in the PROFIBUS guidelines, an Ident Number (ID number) is required for all PROFIBUS devices using PROFIBUS DP communication (except Master Class 2 device), and for PROFIBUS FMS devices which are configured with a GSD file.

The ID number allows devices connected to the bus to be identified with a minimum amount of protocol overhead. In addition, the ID number is used to archive files which contain information on device features and configuration (i.e. GSD files). An ID number is only assigned for devices which conform to the PROFIBUS guidelines.

How to register a PROFIBUS device for an ID

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PNO handles the registration of PROFIBUS devices on behalf of PI. The manufacturer completes the Registration Form and sends it to the address indicated on the form. After registration of the data, he receives a written confirmation of the ID number assigned, including the registered device data.

Manufacturers must register each device type at PNO and get either a manufacturer and/or profile specific ID number. The ID number is not a serial number. The value range is 0001 Hex to FFFE Hex. As soon as an ID number for a device type has been assigned to a manufacturer by PNO, this number can be used for each manufactured device of this type without renewed registration. If the device is modified technically, it remains associated with the device type provided if it is still possible to describe the parameters, modules and options (e.g. modular I/O devices) in a single GSD file. The use of an already existing ID number is only possible in exceptional cases, for which a corresponding manufacturer declaration is needed. (Details are described on the Registration Form.)