Siemens SIMATIC S7-1500/ET 200МР Manual page 77

Interrupts/diagnostic messages
5.3 Hardware interrupts
You can activate any combination of events to trigger hardware interrupts.
You can obtain detailed information on the event in the hardware interrupt organization
block with instruction "RALRM" (Read additional alarm information) and in the information
system of STEP 7.
Which channel of the module and which event has triggered the hardware interrupt is
entered in the start information of the organization block. The following figure shows the
assignment to the bits of the local data double word 8.
Figure 5-2 Start information of the organization block
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Technology module TM Count 2x24V (6ES7550-1AA01-0AB0)
Equipment Manual, 12/2020, A5E31870371-AC