Siemens S7-300 - Event Recognition by Cpus 31 X-2 Acting as the DP Slave

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
11-19
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When configuring the DP master, define a
diagnostic address for the DP slave (in the
associated project of the DP master).
Below, this diagnostic address is labeled
$VVLJQHGWR'3PDVWHU.
The DP master receives information about
the status of the DP slave or about a bus
interruption by means of this diagnostic
address.
During configuration of the DP slave, you
also specify a diagnostic address assigned
to the DP slave (in the associated project of
the DP slave).
Below, this diagnostic address is labeled
$VVLJQHGWR'3VODYH.
This diagnostic addresses is used by the DP
slave to obtain information on the status of
the DP master or a bus interruption.
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CPU 318-2 DP >= V 3.0.0
When CPU318-2 DP act as a master in DPV1 mode, you assign two different
diagnostic addresses for an I-Slave, one diagnostic address for Slot 0 and one for
Slot 2. Both addresses have the following functions:
• The diagnostic address for slot 0 reports in the master all events relating to the
complete slave (node representative), e.g. node failure.
• The diagnostic address for slot 2 is used to report events that affect this slot.
For example, if the CPU is acting as an intelligent slave, it returns the diagnostic
interrupts for operating state transitions.
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The table below shows how CPU 31x-2 operating as DP slave recognized
operating state transitions or data exchange interruptions.
Table 11-11 Event recognition by CPUs 31x-2 acting as the DP slave
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Bus failure interrupt (short-
circuit, connector unplugged)
• Calls OB 86 with the message 6WDWLRQIDLOXUH
(incoming event; diagnostic address of the DP slave,
assigned to the DP slave)
• with I/O access: Call of OB122 (I/O access error)
DP master: RUN → STOP • Calls OB 82 with the message 0RGXOHHUURU(incoming
event; diagnostic address of the DP slave assigned to
the DP slave; Variable OB82_MDL_STOP=1)
DP master: STOP → RUN • Call of OB82 with the message 0RGXOH2.(outgoing
event; diagnostic address of the DP slave, assigned to
the DP slave; Variable OB82_MDL_STOP=0)