Product Range » System Components

Standard Interfaces

 

input output unit

The Input/Output Unit with Isolator provides two voltage-free, single pole, change-over relay outputs, a single monitored switch input and an unmonitored, polarised opto-coupled input.

The Input/Output Unit supervises one or more normally-open switches connected to a single pair of cables.

The Input/Output Unit is fitted with a bi-directional short-circuit isolator and will be unaffected by loop short-circuits on either loop input or output.


 



switch monitor

The Switch Monitor with Isolator is designed to monitor the state of one or more single pole, volt-free contacts connected on a single pair of cables. It also reports the status to Apollo compatible control equipment.

The Switch Monitor with Isolator provides four input states to the control equipment: 'Normal', 'Fault', 'Pre-alarm' and 'Alarm'. These are derived from the switched resistive values shown in Table 2 overleaf. The Switch Monitor with Isolator has a red LED to indicate an alarm and two yellow LEDs to indicate a switch input wiring fault or a loop short-circuit wiring fault.

The Switch Monitor with Isolator is fitted with a bi-directional short-circuit isolator and will be unaffected by a single short-circuit on either loop input or output. For further information on isolators please refer to datasheet PP2090, available on request.


 



zone monitor

The Zone Monitor with Isolator returns a preset analogue value when all detectors on the zone are in quiescent state. A different value is returned when a detector changes to the alarm state. The Zone Monitor with Isolator latches in the alarm state.

The Zone Monitor with Isolator is fitted with a bi-directional short circuit isolator and will be unaffected by loop short circuits on either the loop input or loop output.


Fire Detectors
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Addressable Detectors
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System Components
Specialist Applications
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