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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Process interrupt of digital input modules
Figure 4-11 Structure as of byte x+4 for process interrupt (digital input)
Process interrupt of analog input modules
Figure 4-12 Structure as of byte x+4 and byte x+5 for process interrupt (analog input)