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Scan Time 104ms when Alarm trigger active

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I am using a Vision 1040 with the Alarm server, when the trigger bit for the alarm is active the scan time goes from 3ms to 104ms and the screen flickers and the unit is unresponsive. Once the trigger bit is cleared the scan time returns to normal.

I'm using a set coil for the Alarm trigger, and have only programmed 1 alarm so far, need to do 24 more??



Does the Alarm use interrupts to check status bits??


Any help or suggestions please



Vision version  9.7.0



O/S 3.8

Bin Lib 0.3.10

boot 2.2


Attached pic shows ladder, MB810 is alarm trigger


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