Siemens SIMATIC ET 200SP Manual - Page 40

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Drivers, parameters, diagnostics messages and address space

A.5 Hardware interrupts

A.5

Hardware interrupts

Hardware interrupts
The DI 16×24VDC HA generates a hardware interrupt for the following events:
● At a rising edge (signal change from 0 to 1)
● At a falling edge (signal change from 1 to 0)
Interrupt OBs are called automatically if an interrupt occurs.
You can find detailed information on the event in the hardware interrupt organization block
with the "RALRM" instruction (read additional interrupt information).
The module channel that triggered the hardware interrupt is recorded in the start information
of the OB40 in the OB40_POINT_ADDR tag. The figure below shows the assignment to the
bits of local data double word 8.
Figure A-4
40
Start information of the organization block
Digital Input Module DI 16x24VDC HA (6DL1131-6BH00-0PH1)
Manual, 05/2017, A5E39265608-AA