Bosch PLN-1EOL End-of-Line Supervision Board

Ensure continuous, automated monitoring of your public address and voice alarm loudspeaker lines with the Bosch PLN-1EOL End-of-Line Supervision Board. Designed for integration into professional PA, mass notification and security systems, this end-of-line (EOL) board detects the inaudible 20 kHz pilot tone to confirm line integrity without interrupting background music or live announcements. When the pilot tone is present the onboard LED lights and a voltage-free switch (200 V, 1 A) closes, enabling immediate fault reporting to your Bosch voice alarm controller or building management system. The PLN-1EOL supports 100 V loudspeaker lines and can be daisy-chained to monitor multiple zones from a single input, simplifying surveillance and monitoring of complex speaker topologies. EN 54-16 certification ensures the board meets stringent voice alarm standards, giving you confidence in compliance and reliability. Ideal for commercial, education, healthcare and transportation installations, the PLN-1EOL reduces maintenance time and enhances emergency readiness. Add the Bosch PLN-1EOL to your PA or security design to streamline line supervision — contact sales or specify it for your next voice alarm project.

• Verifies loudspeaker line integrity in real time using inaudible 20 kHz pilot tone detection
• Provides a voltage-free relay (200 V, 1 A) for reliable fault reporting to PA/voice alarm controllers
• Fast visual confirmation with onboard LED to reduce troubleshooting time on site
• Daisy-chainable design lets you monitor multiple branches or zones from a single fault input
• EN 54-16 certified compatibility for trustworthy performance in certified voice alarm and mass notification systems
• Compact form factor fits built-in mounts on selected Bosch loudspeakers for cleaner, faster installation