Application note
Notification on analogue channels
Notification is a means of raising a flag when a selectable event occurs.
Notification on analogue channels can be selected as
– Notification on Level Crossing.
– Notification on DeltaLevel.
– No load / Wire broken.
– Change in Channel_Error.Actual.
Notification on limit crossing can be enabled to create a flag when the AnalogIn value crosses the defined limits while increasing and/or decreasing.
Two limits can be defined per channel: Level1 and Level2.
Notification on DeltaLevel
Can be enabled to create a flag, when the AnalogIn value has changed by more than a certain level.
DeltaLevel defines by how much a measured value needs to change either positively or negatively (deviate), compared to the last DeltaLevel Notification value, for a new notification to be made.
No load / Wire broken, when using the analogue channels in 4–20 mA mode, a current monitor can be enabled to make a notification if the current drops below 3 mA.
(See also: ChConfig.EnableNotification
Related Topics
Limit alarms
Signal out of range alarms
Application note for PD 640 (mA)
Application note for PD 641 / 643 (Pt100 / Pt 1000)
Application note for PD 642 / 643 (mV / thermocouple)
Analogue modules
