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Alarm If Value is INVALID or NULL
Alarm Null Data

Im wondering if there is a way to monitor a tag value and simply trigger an alarm based off of if the value is invalid or not recieving a value.

Im wondering if there is a way to monitor a tag value and simply trigger an alarm based off of if the value is invalid or not recieving a value.

You can test for validity with the Valid() function:

https://www.vtscada.com/help/Content/Pro_Functions/Valid.htm

Using an expression ...

Valid(MyTag\Value)

... within an alarm tag:

https://www.vtscada.com/help/Content/D_Tags/Alarm-Tag.htm?tocpath=Reference%7CTag%20Reference%7CAlarm%20System%20Tags%7C_____1

You can test for validity with the Valid() function: https://www.vtscada.com/help/Content/Pro_Functions/Valid.htm Using an expression ... ```` Valid(MyTag\Value) ```` ... within an alarm tag: https://www.vtscada.com/help/Content/D_Tags/Alarm-Tag.htm?tocpath=Reference%7CTag%20Reference%7CAlarm%20System%20Tags%7C_____1
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