Siemens SIMATIC ST-1500 Function Manual page 198

Hardware interrupt: Comparison event for DQ occurred
This parameter specifies whether a hardware interrupt is generated when a comparison
event occurs based on the comparison function that was selected under "Set output".
The hardware interrupt is not enabled in the default setting.
Counting, measurement and position detection
Function Manual, 12/2017, A5E32009889-AG
Using the module
5.2 Using the digital input module
197