Hardware Interrupts - Siemens SIMATIC ET 200SP HA Manual

Drivers, parameters, diagnostics messages and address space
A.6 Hardware interrupts
A.6

Hardware interrupts

Hardware interrupts
The I/O module can initiate hardware interrupts when limit violations of analog input signals
occur.
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 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
The module analog input (channel) that has triggered the hardware interrupt is entered in
variable OB40_POINT_ADDR in the start information of OB40. The figure below shows the
assignment to the bits of local data double word 8.
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Analog Input Module AI 16xI 2-wire HART HA ( 6DL1134-6TH00-0PH1)
Manual, 11/2017, A5E39408968-AB