QUESTION:
With CPU 315-2DP (MLFB: 6ES7 315-2AG10-0AB0) I can set the protocol only to "DPV1". In the ET200X there then appears another diagnostics address. What is displayed at this address?

ANSWER:  
With the DPV1 standard a difference is made between the actual station and the header module for that station. Both components receive their own diagnostics address.

With the additional diagnostics address you can, for example, evaluate interrupts that only initiate from the interfacing (e.g. BM 141). This is also the case with other DPV1 slaves (such as the IM153-2 for the ET200M).
Likewise diagnostics is stored via the address if there is a module plugged into the system which cannot store its own diagnostics messages. If a problem is detected in this module, then diagnostics is reported for this module by the header via this address.

Fig. 1: ET200X with DPV1 protocol

See Entry ID 7027576 for more information concerning this topic and about the transfer from EN50170 to DPV1.

Note:
The diagnostics address is not displayed if the station has been configured via a GSD file.