Siemens SIMATIC NET CP 5613 Manual page 22

Overview of PROFIBUS DP
Diagnostics
If a DP slave detects an error/fault during the initialization or productive phase, it
can signal this to the DP master in the form of diagnostic data. The received
diagnostic data are entered in the diagnostic area of the DP master. In this case,
the DP application is then responsible for reacting to the error.
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DP Base Programming Interface for CP 5613/CP 5614
C79000-G8976-C108-02