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Figure 4-43.Latching/Holding Deviation Alarm
4.3.1.1.4.14 Deviation Band Alarm
A deviation band alarm presets two reference levels relative to set point. Two types of
deviation band alarm can be configured for alarm 1 and alarm 2. These are deviation band high
alarm (A1FN or A2FN select DB.HI) and deviation band low alarm (A1FN or A2FN select DB.LO).
A1SP and A1HY are hidden if alarm 1 is selected with deviation band alarm. Similarly, A2SP and
A2HY are hidden if alarm 2 is selected with deviation band alarm. Trigger levels of deviation band
alarm are moving with set point. For alarm 1, trigger levels=SP1± A1DV. For alarm 2, trigger
levels=SP1 ±A2DV.One of 4 kinds of alarm modes can be selected for alarm 1 and alarm 2.
These are Normal alarm, latching alarm, Holding alarm and Latching/Holding alarm.
Figure 4-44.Normal Deviation Band Alarm
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