When alarm 1 appears, output A activates relay 1 (R1) which activates an alarm horn on the diagram. Output
B of alarm 1 activates relay 2 (R2). In the diagram, R2 is connected to the alarm panel.
Alarm 2 activates R1 and R4.
Alarm 3 activates R1 and R4.
Several alarms can activate the same relay.
Each alarm can activate none, one or two relays. (None means that only a display
message is given.)
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