Hi, I have been trying to figure out a way to setup an alarm for an Amp Load that goes to 0 from not 0. I don’t want it to alarm if the value starts at 0. I would prefer using an expression for this but hasChanged only seems to work with expression tags or transaction groups. I know I can use a tagChange event using previous and current values but I prefer not to use scripting for this considering how many alarms I will have with this setup. Any tips would be greatly appreciated!
So update, hasChanged does work despite the tag not being an expression tag as the IA Manual states for it. But with the value being a float using 0 or 0.0 does not seem to work in the expression I created so I have to using something like this hasChanged({Value}) && {Value} < 0.001 but this does work for my use case.
using abs works hasChanged({Value}) && abs({Value}) == 0