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Commissioning and Diagnostics
5.5
Evaluating ET 200X interrupts
With certain faults, interrupts are triggered by the DP slave. Interrupts are
evaluated differently from each other, depending on the DP master being used.
Evaluating interrupts with S7 DP master
Prerequisite: You have configured the ET 200X with STEP 7 as of version 3.1.
When an interrupt occurs, interrupt OBs are processed automatically in the CPU of
the DP master if you have programmed them (refer to the System Software for
S7-300/S7-400, Program Design programming manual).
Evaluating interrupts with a different DP master
If you are operating the ET 200X with a different DP master, the alarms are
simulated within the extended diagnosis of the ET 200X (see Section 5.6.7
onwards). You must continue processing the results of the diagnosis in the
application of the DP master.
Note
In order to be able to evaluate alarms by means of the extended diagnosis with a
different DP-master, take note of the following:
S
The DP master must be able to save the diagnostic messages; it might store
the diagnostic messages in a ring buffer, for example. If the DP master cannot
store diagnostic messages, only the latest diagnostic message to be received
is stored, for instance.
S
You have to poll regularly in your user program the corresponding bits in the
extended diagnosis. Take into account the bus transit time with PROFIBUS-DP
so that you can retrieve the bits at least in synchronism with the bus transit
time, for example.
S
With an IM 308-C as a DP master you cannot use process alarms and cycle
end alarms within the extended diagnosis.
5-24
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
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