A Plena end-of-line board is a PCB designed to detect the 20 kHz pilot tone generated by a supervised public address or voice alarm system. It activates a voltage free switch in the presence of a 20 kHz signal (pilot tone) above 5 V, as well as an LED for easy visual confirmation of operation.

Feature

• Pilot tone detection on 100 V loudspeaker lines 
• Voltage free switch 200 V 1 A and LED indications of pilot tone 
• Daisy chainable for monitoring multiple zones on a single input contact 
• Fits on built-in mounts on selected Bosch loudspeakers 
• EN 54‑16 certified

Model

• PLN-1EOL