Siemens S7-300 Installation Manual page 136

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With CPU318 >= V3.0 as a master with a DPV1 configuration, you assign two
different diagnostic addresses for S7 slaves:
• Diagnostic address of the slave (address for slot 0)
At this address all slave events are reported in the DP master (Node
representative), e.g. Node failure.
• Diagnostic address of the module (address for slot 2)
This address is used to report events (OB82) in the master that affect the
module. With a CPU as DP-Slave, for example, diagnostic interrupts for
operating mode transitions are reported at this address.
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• The PROFIBUS subnet has been configured.
• The DP slaves are ready for operation (see relevant DP slave manual).
• An MPI/DP interface as DP interface must be configured accordingly (only CPU
318-2).
• You must configure the CPU as DP master prior to commissioning. That is, in
67(3  you must:
configure the CPU as a DP master,
–
assign a PROFIBUS address to the CPU,
–
assign a master diagnostic address to the CPU,
–
integrate the DP slaves into the DP master system.
–
Is a CPU 31x-2 DP a DP slave?
If so, you will find that DP slave in the PROFIBUS-DP catalog as DOUHDG\
FRQILJXUHG 1RGH. In the DP master, assign a slave diagnostic address to
this DP slave CPU. You must interconnect the DP master with the DP slave
CPU and specify the address areas for data exchange with the DP slave
CPU.
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Commission CPU 31x-2 DP as DP master in the PROFIBUS subnet as follows:
1. Download the PROFIBUS subnet configuration (preset configuration) you have
created in 67(3  from the PG to CPU 31x-2 DP.
2. Switch on all of the DP slaves.
3. Switch CPU 31x-2 DP from STOP to RUN mode.
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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01