Siemens SIMATIC ET 200M Operating Instructions Manual page 212

Interrupt, error and system messages
9.1 PROFIBUS DP
Faults when removing and inserting will be tolerated for up to 1 second. This means, that in
such a case the output values will not change within the tolerance time.
Interrupts with a different DP master
If the ET 200M is being operated with a different DP master, these interrupts will be shown as
device-related diagnostics of the ET 200M. You must continue to process the respective
diagnostic events in the user program of the DP master.
Saving the Diagnosis
In dependence of byte x+1, transfer the contents of the device-specific diagnosis to a data
block, as
• The interrupts are updated cyclically.
• the contents of the diagnosis as of byte x+3 are dependent upon whether S7 diagnosis or
hardware interrupt or removal or insertion interrupt has been reported.
Note
In order to evaluate diagnostics and hardware interrupts via the device-specific diagnosis
with a different DP master you must note:
• the DP master should be able to save the diagnosis messages, i.e. the diagnosis
• You must scan the relevant bits in the device-related diagnostic data in your user
• With an IM 308-C connection as a DP master you cannot use the hardware interrupts
Inserting / removing interrupts with other DP masters
If you use the ET 200M with "Change during Operation" on a different DP master, you must
note that this cannot evaluate the inserting and removing interrupts. You can evaluate the
inserting or removing events in the code- and device-specific diagnosis of the IM 153-x.
Tip: Evaluate the module status in the enhanced diagnosis.
212
WARNING
messages should be stored within the DP master in a ring buffer. If the DP master
cannot save the diagnosis messages, e.g. then always only the last incoming diagnosis
message will be saved.
program at regular intervals.
within the device-specific diagnosis, as only incoming - and not outgoing - interrupts
can be reported. E.g. the bit "Upper limit exceeded" is then only reset when the bit
"Lower limit exceeded" is set. End of cycle interrupts are not supported by the IM 308 C
as end of cycle interrupts are updated to "1" with each end of cycle (the level of the
signal does not change).
Operating Instructions, 04/2022, EWA-4NEB7806006-09
ET 200M