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For example,
Set point =10
At 10.00.01 Hrs, Tag1=40
At 10.00.02 Hrs, Tag1 = 51
Then, job or alarm is activated
5.1.1.10.1.6 Dev-
It is deviation- event. This event will be triggered on the negative deviation of process value. The job or
alarm is activated when the process value is deviated by the value lower than set point from the previous
process value.
For example,
Set point =10
At 10.00.01 Hrs, Tag1=40
At 10.00.02 Hrs, Tag1 = 29
Then, job or alarm is activated.
5.1.1.10.1.7 Error
It is error event. This event will be activated when there is an error on the input of the channel.
5.1.1.10.2 Set point
Set point for the event.
5.1.1.10.2.1 Hysteresis
To avoid the alarm or event been activated too often, Hysteresis value can be defined for the
event trigger set point.
5.1.1.10.2.2 Holding time
To avoid the alarm or event been activated too often, the holding time can be defined for the
event trigger set point. In process sometimes SP is reached but it will go down immediately, this might due
to process instability. To avoid these kind of nuisance situations, the holding time can be used to see that
PV stays at above that SP more than the holding time and then only activate the action for that event. The
range of holding time can be set from 1 min to 60 min.
5.1.1.10.3 Log
The event can be logged as alarm or event. They can be selected from the available options.
They are as below.
5.1.1.10.3.1 Log Alarm
Log the event as Alarm.
5.1.1.10.3.2 Log Alarm (Auto Ack)
Log the event as alarms and acknowledge automatically
5.1.1.10.3.3 Log Event
Log as event
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