means of adjusting setpoints whilst running.
Default setting: 0.0
4.2.3.1.4 HySt ( Alarm hysteresis or dead band )
This enables the hysteresis or dead-band to be programmed. This is the difference
between the points at which the alarm triggers and releases and is expressed as a
percentage of engineering range. For high and low alarms, the alarm triggers exactly at
setpoint and is removed at the hysteresis level away from the setpoint. See example
based upon a high alarm below.
In the case of deviation alarms, the hysteresis is applied to each trigger point either
side of the setpoint.
Note that for thermocouples, a 1% hysteresis band would be equal to 20 degrees
Centigrade and 10 degrees Centigrade for an RTD.
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