Bosch FLM-420-NAC-S

The Bosch FLM-420-NAC-S Notification Appliance Circuit Module is an advanced interface designed for the monitoring and activation of notification appliances within Local Security Network (LSN) systems. This module allows for the seamless integration of acoustic and optical signal devices, such as sirens, into fire alarm control panels.

Key Features:

• Rotary switches for automatic or manual address setting
• Control of notification appliance circuits via polarity reversal
• Synchronized activation of all connected notification devices
• 10 selectable output signal types via LSN
• Maintains LSN loop functionality during cable breaks or short circuits with built-in short-circuit isolators
• Surface-mountable housing

Module Functions:

• Activation of notification appliances in alarm conditions
• Monitoring of notification appliance circuits
• External power supply monitoring
• Status indication via LEDs

Upon activation, all notification devices connected to the FLM-420-NAC-S are synchronized through the LSN module. Control of the notification appliance circuit is achieved through polarity reversal, with the NAC zone status indicated by red and green LEDs. The rotary switch allows for easy selection between automatic and manual addressing, with or without automatic detection.

LSN Functions:

• Built-in isolators ensure continued operation in case of short circuits or line breaks
• Fault information is transmitted to the fire alarm control panel