Siemens SIMATIC ET 200SP Manual page 46

Interrupts/diagnostic messages
5.3 Interrupts
Reactions to a diagnostic interrupt
The following happens when an event occurs that triggers a diagnostic interrupt:
● The DIAG LED flashes red.
Once you have remedied the error, the DIAG LED goes out.
● The S7-1500 CPU interrupts processing of the user program. The diagnostic interrupt OB
(e.g. OB 82) is called. The event that triggered the interrupt is entered in the start
information of the diagnostic interrupt OB.
● The S7-1500 CPU remains in RUN even if no diagnostic interrupt OB is present in the
CPU. The technology module continues working unchanged if this is possible despite the
error.
Detailed information on the error event is available with the instruction "RALRM" (read
additional interrupt information).
Default setting
The diagnostic interrupt for wire break and the diagnostic interrupts for additional errors are
not enabled by default.
46
Technology module TM PosInput 1 (6ES7138-6BA00-0BA0)
Manual, 02/2014, A5E33015755-AA