Siemens SIMATIC ET 200M Manual page 149

Commissioning and Diagnostics
Interrupts with Another DP Master
If you operate the ET 200M with another DP master, these interrupts are simulated
as a device-specific diagnosis of the ET 200M. You must postprocess the relevant
diagnostic events in the DP master's user program.
Saving the Diagnosis
Depending on byte x+1, transfer the contents of the station diagnosis to a data
block because:
S The interrupts are updated cyclically.
S The contents of the diagnosis as of byte x+3 depend on whether the S7
diagnosis or S7 process interrupt or module insertion/removal module interrupt
is reported.
Note
The following points are important in evaluating diagnostic interrupts and process
interrupts with a different DP master by means of the station diagnosis:
S
The DP master should be able to store the diagnostic messages, that is, the
DP master should have a ring buffer in which to place these messages. If the
DP master can not store diagnostic messages, only the last diagnostic
message will be available for evaluation.
S
You must scan the relevant bits in the device-related diagnostic data in your
user program at regular intervals.
S
You cannot use process interrupts in the station diagnosis in an IM 308-C as
DP master, because only coming – and not going – interrupts are reported. For
example, the "upper limit violation" bit is only reset when the "lower limit
violation" bit is set. The cycle end interrupt is not supported by the IM 308-C,
because the cycle end interrupt updates to "1" at the end of each cycle (i.e.
there is no change in the signal level).
Module Removal/Insertion Interrupts with Other DP Masters
If you use the ET 200M with module change during operation on another DP
master, you must make sure that it cannot evaluate the module removal and
insertion interrupts. You can evaluate the module removal and insertion events in
the module and station diagnosis of the IM 153-x.
Tip: Evaluate the module status in the enhanced diagnosis.
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Distributed I/O Device ET 200M
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