PROFIBUS DP
5.1 CPU 41x-3 PN/DP as DP master / DP slave
S7-400 Automation System, CPU Specifications
5-18 Manual, 10/2006, 6ES7498-8AA04-8BA0
Diagnostic Addresses in Connection with DP Master Functionality
You assign diagnostic addresses for the PROFIBUS DP in the CPU 41x. Verify in your
configuration that the DP diagnostic addresses are assigned once to the DP master and
once to the DP slave.
Table 5-11 Diagnostic addresses for the DP master and DP slave
S7 CPU as DP master S7 CPU as DP slave
During the configuration of the DP master, you specify
(in the associated project of the DP master) a diagnostic
address for the DP slave. In the following, this
diagnostic address is described as being assigned to
the DP master.
By means of this diagnostic address the DP master
receives information on the status of the DP slave or a
bus interruption (see also table "Event detection of the
CPUs 41x as DP master").
During the configuration of the DP slave, you also specify (in the
associated project of the DP slave) a diagnostic address that is
assigned to the DP slave. Below, this diagnostic address is
labeled assigned to DP slave.
By means of this diagnostic address the DP slave receives
information on the status of the DP master or a bus interruption
(see also table "Event detection of the CPUs 41x as DP slave").
Event Detection
The following table shows you how the CPU 41x as DP slave detects any operating mode
changes or interruptions in data transfer.
Table 5-12 Event detection of the CPUs 41x as DP slave
Event What happens in the DP slave?
Bus interruption
(short-circuit, connector
removed)
• Calls OB86 with the message
Station failure
(incoming
event; diagnostic address of the DP slave, assigned to
the DP slave)
• With I/O access: call of OB 122 (I/O access error)
DP master RUN → STOP
• Calls OB82 with the message
Module error
(incoming
event; diagnostic address of the DP slave assigned to
the DP slave; Variable OB82_MDL_STOP=1)
DP master STOP → RUN
• OB82 is called with the message
Module OK
(event
exiting state; diagnostic address of the DP slave that is
assigned to the DP slave; variable
OB82_MDL_STOP=0)
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