Alarm hysteresis type: general parameter, Alarm hysteresis, Type: general parameter – Pyromation Series 610 1_16 DIN User Manual
Page 140: Alarm 1 hysteresis, Alarm 2 hysteresis, Alarm 3 hysteresis, Alarm 4 hysteresis, Figure 41. alarm hysteresis operation, Din controllers & indicators - product manual
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Alarm Hysteresis
Type: General Parameter
An adjustable band on the “safe” side of an alarm point, through which the process variable
must pass before the alarm will change state, as shown in the diagram below. E.g. a high
alarm’s hysteresis band is below the high alarm value, and a low alarm’s hysteresis is above
the low alarm value.
Also refer to Alarm Operation.
PROCESS
HIGH ALARM
PROCESS
LOW ALARM
BAND ALARM
DEVIATION
HIGH ALARM
DEVIATION
LOW ALARM
Inactive
Inactive
Inactive
Inactive
Inactive
Inactive
Alarm Inactive
Alarm Inactive
Inactive
Inactive
Inactive
Alarm Value
Alarm Value
Alarm Value
(from Setpoint)
Setpoint
Process Variable
Process Variable
Process Variable
Process Variable
Process Variable
Alarm Hysteresis Value
Alarm Hysteresis Value
Alarm Hysteresis Value
Alarm Hysteresis Value
Alarm Hysteresis Value
Alarm Hysteresis Value
Setpoint
Setpoint
Alarm Value
(from Setpoint)
Alarm Value
(from Setpoint)
Alarm Value
(from Setpoint)
Alarm Active
Active
Active
Active
Active
Active
Figure 41.
Alarm Hysteresis Operation
59305, Issue 6 – March 2006
Glossary
Page 135