Alarm, error and system messages
9.1 PROFIBUS DP
ET 200pro distributed I/O system
196 Operating Instructions, 03/2013, A5E00335544-08
Evaluating interrupts
Introduction
Certain errors trigger an interrupt at the DP slave.
Interrupts supported by ET 200pro:
● Diagnostic interrupts
● Process interrupts
● Swapping interrupts
Evaluating interrupts with DPV1 master
The CPU of the DP master automatically calls the interrupt OBs after an interrupt was
generated. Additional information is available in the System and Standard Functions for
S7-300/400 (http://support.automation.siemens.com/WW/view/en/1214574
) Reference
Manual.
Note
The system does not generate any interrupts when ET 200pro is operated with a DPV0
master, or in DPV0 mode (as standard DP slave).
Triggering of a diagnostic interrupt
The module triggers a diagnostic interrupt when it registers incoming or outgoing events,
e.g. a cable break, and "Enable diagnostic interrupt" is set.
The CPU interrupts the user program and executes the diagnostics block OB 82. The
interrupt triggering event is logged in the start information of OB 82.
Triggering a process interrupt
If there is a process interrupt, the CPU interrupts user program execution and processes the
process interrupt block OB 40. The result that triggered the interrupt is added to the start
information of OB 40.
Note
Process interrupts should not be used for technological purposes (cyclic generation of
process interrupts, for example), because these can become lost in the overall system.
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