Diagnostic Addresses For Dp Masters And Dp Slaves - Siemens SIMATIC S7-300 Hardware And Installation Manual

Diagnostic Addresses
With CPU 31x-2 you assign diagnostic addresses for the PROFIBUS-DP. Make
sure during configuration that DP diagnostic addresses are assigned to the DP
master and to the DP slave.
CPU as DP master
When you configure ithe DP
masters, you have to specify (in
the associated project of the
DP masters) a diagnostic
address for the DP slave. In the
following, this diagnostic address
is refered to as
DP master
The DP master recieves
information on the status of the
DP slaves or on a bus
interruption via this diagnostic
address.
Figure 10-4 Diagnostic addresses for DP masters and DP slaves
Special features of CPUs 31xC-2DP
With CPUs 31xC-2DP operating as master, assign two different diagnostic
addresses to one I-Slave, one diagnostic address to slot 0 and one diagnostic
address to slot 2. These two addresses have the following functions:
• The diagnostic address for slot 0 reports in the master all events relating to the
complete slave (station representative), e.g. station failure.
• The diagnostic address for slot 2 is used to report events at this slot, that is,
with the CPU operating as I-Slave it reports the diagnostic interrupts for
operating state transitions.
Event Recognition
The table below shows how CPU 31x-2 operating as DP master recognizes
operating mode transitions of a CPU operating as DP slave or data exchange
interruptions.
Table 10-8
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
Testing functions, Diagnostics and Fault Elimination
PROFIBUS DP
During configuration you must specify two diagnostic addresses:
Diagnostic address
allocated to the
.
Event recognition of CPU 31x-2 operating as DP master
CPU as DP slave
Diagnostic address
When you configure the DP slaves
you must also specify (in the
associated projects of the DP
slaves) a diagnostic address that is
allocated to the DP slave. In the
following, the diagnostic address is
refered to as allocated to the DP
slave.
The DP slave receives information
on the status of the DP masters or
on a bus interruption via this
diagnostic address.
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