PROFINET defines Identification and Maintenance functions since PROFIBUS. As there is a long history, some restrictions in these data are possible. In general, I&M contain defined properties and values to identify the asset more precise as it is possible with IDs and without knowledge of the GSD file.

• I&M0 – Electronic Faceplate (PN-M for device, PN-O for Modules):Version Information of the submodule like serial number, HW-Version and FW-Version. I&M0 data are read-only.
• I&M1 – function and location (PN-O):A unique function and location of the device/submodule as visible strings. I&M1 data must be written by a PROFINET engineering tool or PLC before they can be used. The mapping to marking systems like IEC 81346 are in the responsibility of the user and not in scope of this document.
• I&M2 – comment (PN-O):A comment to the device as visible string. I&M2 data must be written by a PROFINET engineering tool or PLC before they can be used.
• I&M3 – installation date (PN-O):The installation date of the device. I&M3 data must be written by a PROFINET engineering tool or PLC before they can be used.
• I&M4 – signature (PN-M and defined for Functional Safety):If the submodule is configured by an external safety configuration tool, this tool can write a signature of the parameter set in I&M4 data of the submodule. With its signature it is possible to discover differences between a stored parameter set of the engineering tool and a parameter set in the field. I&M4 is only defined for safety devices.
• I&M5 – additional information (PN-O)Offers additional information about a communication module which is part on an IO device. If the device (e.g. a robot) is made by company A, and the communication module by company B, I&M0 contain information about the robot and company A, I&M5 contain information about the communication module and company B.