The IF4 is a DIN rail mount robust module designed to locate in a central Public Address and General Alarm PA/GA MDF.
The IF4 is designed to control an external ship’s whistle in synchronisation with PA/GA system alarm tone cadence broadcast. The interface is implemented by a volt/earth free normally open contact which is extended from the IF4 to the ship’s whistle control panel.
The IF4 interface contact is rated at DC 24 V 0.25 A non-inductive form „A”. (normally open) and changes state in synchronisation with the broadcast alarm tone.
The IF4 is connected to the 2IP interface port and broadcast 70/100 V line
to source the PA/GA alarm tone cadence and to determine “alarm initiated” status.
Ship Whistle output enable is conditional on the presence of
- “Alarm initiated” contact closed
- Alarm drive audio output.