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