Siemens CPU 313C Hardware And Installation Manual page 136

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Is the DP CPU a DP slave?
If so, you will find that DP slave in the PROFIBUS-DP catalog as DOUHDG\
FRQILJXUHG VWDWLRQ. 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 the DP CPU as a DP master in the PROFIBUS subnet as follows:
1. Download the configuration of the PROFIBUS subnet created with 67(3 
(preset configuration) to the DP CPU using the PG.
2. Switch on all of the DP slaves.
3. Switch the DP CPU from STOP to RUN.
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During start-up, the DP CPU checks the configured preset configuration of its DP
master system against the actual configuration.
If preset configuration = actual configuration, the CPU switches to RUN mode.
If the preset configuration ≠ to the actual configuration, the configuration of
parameter VWDUWXS LI SUHVHW FRQILJXUDWLRQ z DFWXDO FRQILJXUDWLRQ determines
the start-up behavior of the CPU.
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DP CPU switches to RUN.
(BUSF LED flashes if any of the DP slaves
cannot be addressed)
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DP CPU remains in STOP mode, and the
BUS LED flashes after the set 0RQLWRULQJ
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The flashing BUSF LED indicates that at
least one DP slave cannot be accessed. In
this case, check whether all DP slaves are
switched on or correspond with your
configuration, or read out the diagnostic
buffer with 67(3 .
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