Despatch MIC1422 Controller - Manual (Page 45)

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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