Interrupts - Siemens SIMATIC S7-1500 Manual

5.2

Interrupts

Analog input module AI 4xU/I/RTD/TC ST 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
● Common mode error
● Reference junction
● 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
● Above high limit 2
The module channel that triggered the hardware interrupt is entered in the start information
of the organization block. The diagram below shows the assignment to the bits of double
word 8 in local data.
Figure 5-2 OB start information
Analog Input Module AI 4xU/I/RTD/TC ST (6ES7531-7QD00-0AB0)
Manual, 09/2016, A5E32366209-AC
Interrupts/diagnostics alarms
5.2 Interrupts
39