Commissioning The Cpu As Dp Master - Siemens SIMATIC S7-300 Hardware And Installation Manual

With a CPU 31xC-2DP or with the new, modular CPU315-2 as the master or a
CPU318 >= V3.0 as the master with DPV1 configuration, 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 (station
representative), e.g. station failure.
• Diagnostic address of the module (address for slot 2)
At this address all module (e.g. CPU 313C-2 DP as I-Slave) events are reported
in the master (OB82). With a CPU as DP-Slave, for example, diagnostic
interrupts for operating mode transitions are reported at this address.

9.7.1 Commissioning the CPU as DP master

Requirements for commissioning
• 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
STEP 7 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/31xC-2 DP a DP slave?
If so, you will find that DP slave in the PROFIBUS-DP catalog as already
configured station. 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.
Commissioning
Commission CPU 31x-2 DP/31xC-2 DP as DP master in the PROFIBUS subnet as
follows:
1. Download the PROFIBUS subnet configuration (preset configuration) you have
created in STEP 7 from the PG to CPU 31x-2 DP/31xC-2 DP.
2. Switch on all of the DP slaves.
3. Switch CPU 31x-2 DP/31xC-2 DP from STOP to RUN mode.
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02
Commissioning
9-27