Siemens SIMATIC ET 200M Operating Instructions Manual page 203

Additional interrupt information
The bytes x+4 to x+7 inform you of the interrupt cause. They correspond to the diagnostic
data record 0 in STEP 7.
The bytes x+4 to x+7 as well as x+8 to x+19 correspond to the diagnostic data record 1 in
STEP 7.
Figure 9-9
ET 200M
Operating Instructions, 04/2022, EWA-4NEB7806006-09
Additional interrupt information for diagnostic interrupts of digital and analog modules
Interrupt, error and system messages
9.1 PROFIBUS DP
203