
72
Direct-Acting
Reverse-Acting
Direct-Acting
Reverse-Acting
Direct-Acting
Reverse-Acting
Direct-Acting
Reverse-Acting
Direct-Acting
Reverse-Acting
Process High Alarm
Process High Alarm
Process Low Alarm
Process Low Alarm
Band Alarm
Output Off
Band Alarm
Output On .Output Off
Deviation High
Alarm (+ve values)
Deviation High
Alarm (+ve values)
.Output Off
Deviation Low
Alarm (-ve values)
Deviation Low
Alarm (-ve values)
Alarm Operation
Type: General Definition
The different alarm types are shown below, together with the action of any outputs.
Also refer to
Alarm Hysteresis
,
Alarm Inhibit
,
Band Alarm
,
Deviation Alarm
,
Latching Relay
,
Logical Alarm Combinations
,
Loop Alarm
,
Process High Alarm
and
Process Low Alarm
.
Figure 36. Alarm Operation
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