Siemens SIMATIC IM151-1 STANDARD

Interrupt, error, and system messages
4.4 Diagnostics with STEP 7
Interface module IM151-1 STANDARD (6ES7151-1AA06-0AB0)
Manual, 07/2015, A5E01075950-AD
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Diagnostic interrupt from the modules, byte x+8 to byte x+11
Figure 4-7 Structure of byte x+8 to byte x+11 for diagnostic frame