Table 7-4 Event Detection Of The Cpu 41Xh As A Dp Master; Figure 7-2 Diagnostic Addresses For Dp Master And Dp Slave - Siemens SIMATIC S7-400H System Manual

Diagnostic addresses in connection with DP slave functionality
Assign the diagnostics addresses for PROFIBUS DP at the 41xH CPU. Ensure during
configuration that DP diagnostics addresses are assigned once to the DP master and once
to the DP slave.
Figure 7-2
Event detection
The following table shows how the CPU 41xH in DP master mode detects operating state
changes on a DP slave or interruptions of the data transfer.
Table 7-4 Event detection of the CPU 41xH as a DP master
Event
Bus interruption due to short-circuit or
disconnection of the bus connector
DP slave: RUN → STOP
DP slave: STOP → RUN
S7-400H
System Manual, 09/2007, A5E00267695-03
Diagnostic addresses for DP master and DP slave
What happens on the DP master
OB 86 is called with the message Station failure as an event entering state;
•
diagnostic address of the DP slave assigned to the DP master
With I/O access: OB 122 called, I/O access error
•
OB 82 is called with the message Module error as event entering state;
•
diagnostic address of the DP slave assigned to the DP master; variable
OB82_MDL_STOP=1
OB is 82 called with the message Module OK as event exiting state;
•
diagnostic address of the DP slave assigned to the DP master; variable
OB82_MDL_STOP=0
S7-400H in PROFIBUS DP mode
7.1 CPU 41x–H as PROFIBUS DP master
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