How does an unscheduled trigger with delta value work?
FactoryTalk Transaction Manager gives you control over the criteria that determines which data is stored in the database. If you click Trigger/Storage on the Transaction Definition dialog, the Trigger and Storage Parameters dialog displays. In the Transaction Triggers frame, if On Unscheduled Event is selected, enter a data point as the event to track. If On Change is selected, enter a Positive and Negative Delta Value to Equal or Exceed. The positive/negative delta value to equal or exceed is used to compare the newly acquired trigger value against the previously triggered value. For example, if the unscheduled trigger is the temperature reading from a thermocouple and the temperature has increased .001 degrees, is this significant? The positive/negative delta value to equal or exceed can be set to quantify when a change is significant enough for FactoryTalk Transaction Manager to store the transaction to the database. The newly acquired transaction trigger value is compared with the
