Hardware Interrupts; A.5 Hardware Interrupts - Siemens SIMATIC ET 200SP HA Manual

A.5

Hardware interrupts

Hardware interrupts
The AI 16xTC/8xRTD 2-/3-/4-wire HA generates a hardware interrupt at the following events:
● Violation of the low limit 1
● Violation of the high limit 1
● Violation of the low limit 2
● Violation of the high limit 2
Interrupt OBs are called automatically if an interrupt occurs.
The channel of the AI 16xTC/8xRTD 2-/3-/4-wire HA that has triggered the hardware interrupt
is entered in the start information of the OB 40 in the variable OB40_POINT_ADDR. The
following figure shows the assignment to the bits of the local data double word 8.
You can find detailed information on the event in the hardware interrupt organization block
with the "RALRM" instruction (read additional interrupt information).
Figure A-4
Analog input module AI 16xTC/8xRTD 2-/3-/4-wire HA (6DL1134-6JH00-0PH1)
Manual, 05/2017, A5E39408175-AA
Drivers, parameters, diagnostics messages and address space
Start information of the organization block

A.5 Hardware interrupts

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