Siemens SIMATIC SM 335 Manual page 105

Disadvantage of the diagnostic interrupt
The program is interrupted when OB 82 is invoked. If the program contains time-
critical sequences, the scan time needed for OB 82 may increase the response
time. One way of preventing this is to save only the module start address in OB 82
and evaluate the diagnostic data in OB 1.
SM 335 – High-Speed Analog Input/Output Module for the SIMATIC S7-300
6ES7 335-7HG00-8BA1
Detecting and Correcting Faults
6-3