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11
Output
Alarm Trip Point
Alarm On
Alarm Off
Time in seconds
Counter
Started
Counter
Reset
Counter
Started
Hysteresis Time
Elapsed
Counter
Reset
40
0
0
70
130
Time Hysteresis Status
Example shows time hysteresis set to 70 seconds used with a high process alarm
Process
Variable
Hysteresis
Value
Hysteresis
Value
High Deviation
Positive Trip Value
High Deviation
Negative Trip Value
Alarm Off
Alarm On
Alarm Off
Alarm On
Process
Variable
Hysteresis
Value
Hysteresis
Value
Low Deviation
Positive Trip Value
Low Deviation
Negative Trip Value
Alarm Off
Alarm On
Alarm Off
Alarm On
Control Set Point
Control Set Point
High Deviation
(Positive Trip)
High Deviation
(Negative Trip)
Low Deviation
(Negative Trip)
Low Deviation
(Posiitve Trip)
3
BASIC CONFIGURATION LEVEL…
Fig. 3.5 High and Low Deviation with Hysteresis
Fig. 3.6 Time Hysteresis Alarm