Despatch MIC1422 Controller User Manual download pdf (Page 45)

6.4 Logical Combination of Alarms

Two alarms may be combined logically to create an AND/OR situation.

They may be configured for Reverse-acting or Direct-acting. Either Output

2 or Output 3 may be assigned as Logical Outputs.

Example:

Logical OR of Alarm 1 with Alarm 2

Direct-Acting Reverse-Acting

AL1 OFF, AL2 OFF: Relay OFF AL1 OFF, AL2 OFF: Relay ON

AL1 ON, AL2 OFF: Relay ON AL1 ON, AL2 OFF: Relay OFF

AL1 OFF, AL2 ON: Relay ON AL1 OFF, AL2 ON: Relay OFF

AL1 ON, AL2 ON: Relay ON AL1 ON, AL2 ON: Relay OFF

Logical AND of Alarm 1 with Alarm 2

Direct-Acting Reverse-Acting

AL1 OFF, AL2 OFF: Relay OFF AL1 OFF, AL2 OFF: Relay ON

AL1 ON, AL2 OFF: Relay OFF AL1 ON, AL2 OFF: Relay ON

AL1 OFF, AL2 ON: Relay OFF AL1 OFF, AL2 ON: Relay ON

AL1 ON, AL2 ON: Relay ON AL1 ON, AL2 ON: Relay OFF

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Despatch MIC1422 Controller User Manual Page 45