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5.2
Interrupts
Analog input module AI 8xU/I HF supports the following diagnostic and hardware interrupts.
You can find detailed information on the event in the error organization block with the
RALRM instruction (read additional interrupt info) and in the STEP 7 online help.
Diagnostic interrupt
The module generates a diagnostic interrupt at the following events:
● Missing supply voltage L+
● Wire break
● Overflow
● Underflow
● Parameter assignment error
Hardware interrupt
The module generates a hardware interrupt at the following events:
● Low limit violated 1
● High limit violated 1
● Low limit violated 2
● Violation of high limit 2
The module channel that triggered the hardware interrupt is entered in the start information
of the organization block. The following figure shows the assignment of the local data double
word 8 by the start information of the hardware interrupt organization block.
Figure 5-2
Analog Input Module AI 8xU/I HF (6ES7531-7NF00-0AB0)
Manual, 09/2016, A5E36649087-AB
OB start information
Interrupts/diagnostics alarms
5.2 Interrupts
41
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