Despatch P1400+ Temperature Controller - Manual (Page 78)

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Output Off . . Output On
Alarm Off . . Alarm On
Direct-Acting
Alarm. Value
Output On . . Output Off
Alarm Off . . Alarm On
Reverse-Acting
Alarm. Value
Output On . . Output Off
Alarm On . . Alarm Off
Direct-Acting
Alarm. Value
Output Off . . Output On
Alarm On . . Alarm Off
Reverse-Acting
Alarm. Value
Output On . . Output On
Alarm On . . Alarm On
Direct-Acting
Alarm Value Alarm Value
Output Off .
Alarm On . . Alarm On
Reverse-Acting
Alarm Value Alarm Value
Output Off . . Output On
Alarm Off . . Alarm On
Direct-Acting
Alarm Value
Output On .
Alarm Off . . Alarm On
Reverse-Acting
Alarm Value
Output On . . Output Off
Alarm On . . Alarm Off
Direct-Acting
Alarm Value
Output Off . . Output On
Alarm On . . Alarm Off
Reverse-Acting
Alarm Value
Process High Alarm
Process Variable
Process High Alarm
Process Variable
Process Low Alarm
Process Variable
Process Low Alarm
Process Variable
Band Alarm Output Off
Alarm Off
Process Variable
Band Alarm Output On . Output Off
Alarm Off
Process Variable
Deviation High
Alarm (+ve values)
Process Variable
Deviation High
Alarm (+ve values) . Output Off
Process Variable
Setpoint
Process Variable
Deviation Low
Alarm (-ve values)
Process Variable
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