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

Diagnostics addresses in connection with DP slave functionality
Assign the diagnostics addresses for PROFIBUS DP at the CPU 41xH. Verify in the
configuration that the 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 connector
DP slave: RUN → STOP
DP slave: STOP → RUN
S7-400H
System Manual, 03/2012, A5E00267695-11
Diagnostics addresses for DP master and DP slave
What happens in the DP master
OB 86 is called with the message Station failure as an incoming event;

diagnostics address of the DP slave assigned to the DP master
With I/O access: Call of OB 122, I/O area access error

OB 82 is called with the message Module error as incoming event; diagnostic

address of the DP slave assigned to the DP master; variable
OB82_MDL_STOP=1
OB 82 is called with the message Module OK as incoming event; diagnostic

address of the DP slave assigned to the DP master; variable
OB82_MDL_STOP=0
7.1 CPU 41x–H as PROFIBUS DP master
PROFIBUS DP
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