The **FLM-32-R** is an addressable Output Signal Module (typically part of the Bosch Fire Alarm peripheral line). It is designed to control and monitor the wiring of notification appliances (horns, strobes) or to act as a dry contact relay. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and electronic characteristics of the module: | Component / Feature | Specification | | :--- | :--- | | **Operating Voltage** | 24 VDC (Nominal) | | **Current Consumption** | < 0.2 mA (Standby) / < 6 mA (Alarm) | | **Relay Contact Rating** | 1.0 A @ 30 VDC | | **EOL Resistance** | 3.9 kΩ (typically used for line monitoring) | | **Address Range** | 001 - 254 (Specific to LSN systems) | | **Protection Class** | IP 30 | --- ### 2. Core Electronic Components and Functions #### A. The LSN (Local Security Network) Interface The "brains" of the module consist of an integrated circuit designed for **LSN improved technology**. This allows the fire panel to communicate with the module over a two-wire bus. It handles: * **Digital Addressing:** Configured via rotary switches or electronic addressing. * **Status Reporting:** Sending "Trouble" or "Normal" signals back to the controller. #### B. The Output Relay The module features a physical or solid-state relay that switches the power to the NAC (Notification Appliance Circuit). * **Form C Contact:** Usually provides a change-over contact. * **Power Switching:** It can interrupt or provide 24V power to external devices based on the command from the fire panel. #### C. Monitoring Circuitry One of the most critical electronic functions is **Supervision**. * The module sends a tiny "sense" current through the output line to the End-of-Line (EOL) resistor. * If the wire is cut (Open Circuit) or touching (Short Circuit), the internal electronics detect the change in resistance and report a fault to the main panel. #### D. Rotary Switches On the physical PCB, there are typically three rotary switches. These allow technicians to manually set the decimal address (Hundreds, Tens, Units) of the device so the panel can identify it. --- ### 3. Wiring Configuration The module generally separates high-power notification wiring from the low-power data bus: 1. **LSN Bus (In/Out):** Connectivity to the fire alarm control panel. 2. **External Power Supply:** Input for the 24V DC used to power strobes/horns. 3. **Output Loop:** Connection to the actual notification devices, ending with a 3.9 kΩ resistor.