Siemens SIMATIC ET 200AL System Manual page 427

4.2.3.2 Interrupts
The digital input / digital output module DIQ 16x24VDC/0.5A 8xM12 in the configuration
method 4xCount supports diagnostic and hardware interrupts.
Diagnostic interrupt
The digital input/digital output module generates a diagnostic interrupt at the following
events:
● Short-circuit of an encoder supply to ground, or
● Short-circuit of an output to ground
● Load voltage 2L+ missing or too low
● Parameter assignment error
Hardware interrupt
The module generates a hardware interrupt at the following event:
● Comparison event occurred for DQ
For detailed information on the error event, refer to the hardware interrupt organization block
with the "RALRM" instruction (read additional interrupt info) and to the STEP 7 online help.
The module channel that triggered the hardware interrupt is entered in the start information
of the organization block. The figure below shows the assignment to the bits of the local data
double word 8.
Figure 4-12
Digital input/Digital output module DIQ 16x24VDC/0.5A 8xM12 (6ES7143-5AH00-0BA0)
Manual, 09/2017, A5E38688112-AB
Start information of the organization block in the configuration method 4xCount
4.2 Configuration method 4xCount
Counting
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