Siemens SIMATIC ET 200SP Manual page 79

Interrupts/diagnostic messages
5.2 Diagnostic messages
Reactions to a diagnostic interrupt
The following happens when an event occurs that triggers a diagnostic interrupt:
● The DIAG LED flashes red.
When you have eliminated all errors, the DIAG LED stops flashing red and turns green.
● The S7-1500 CPU interrupts the 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.
You can obtain detailed information on the error event in the error organization block with
instruction "RALRM" (Read additional alarm information), in the information system of
STEP 7 and in function manual Diagnostics
(https://support.industry.siemens.com/cs/ww/en/view/59192926), section "System
diagnostics in user program".
If the module is being operated as a distributed module in an ET 200SP system with
PROFIBUS DP, you have the option of reading out diagnostic data with the RDREC or
RD_REC instruction using data record 0 and 1. You can find the structure of the data records
in the manual for the IM 155-6 DP HF interface module available for download on the
Internet (https://support.industry.siemens.com/cs/ww/de/view/73098660).
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TM Count 1x24V (6ES7138‑6AA01‑0BA0) technology module
Manual, 07/2019, A5E33002339-AD