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

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During start-up, CPU 31x-2 DP compares the preset configuration of your DP
master system to 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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CPU 31x-2 DP switches to RUN mode.
(BUSF LED flashes if any of the DP slaves
cannot be addressed)
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The table below shows how CPU 31x-2 DP operating as a DP master recognizes
operating mode transitions of a CPU operating as a DP slave and data exchange
interruptions.
Table 9-8
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Bus failure interrupt
(short-circuit,
connector
unplugged)
DP slave:
RUN → STOP
DP slave:
STOP → RUN
7LS:
When commissioning the CPU as DP master, always program OB 82 and 86. This
helps you to recognize and evaluate data exchange errors or interruption.
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
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Event recognition by CPUs 31x-2 DP acting as the DP master
•
Call of OB86 with the message 6WDWLRQ IDLOXUH
(coming event; diagnostic address of the DP slave assigned to
the DP master)
•
with I/O access: Call of OB122
(I/O access error)
•
Call of OB82 with the message 0RGXOH HUURU
(incoming event; diagnostic address of the DP slave assigned to
the DP master; Variable OB82_MDL_STOP=1)
•
Call of OB82 with the message 0RGXOH 2.
(outgoing event; diagnostic address of the DP-Slave assigned to
the DP master; Variable OB82_MDL_STOP=0)
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CPU 31x-2 DP remains in STOP mode.
When the 0RQLWRULQJ WLPH IRU SDUDPHWHU
WUDQVIHU WR PRGXOHV runs out, the BUSF
LED starts flashing.
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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