The **FLM-0D-R** is an electronic component primarily associated with **Siemens Fire Safety** systems. It is an Addressable Relay Module designed to interface with fire alarm control panels (FACP). ### 1. Technical Specifications The following table outlines the key electrical and physical characteristics of the FLM-0D-R: | Specification | Details | | :--- | :--- | | **Type** | Addressable Dual-Relay Module | | **Operating Voltage** | 18 to 31 VDC | | **Current Consumption** | 1 mA (Standby), 5 mA (Active) | | **Relay Contact Rating** | 2A @ 30 VDC / 0.5A @ 125 VAC | | **Protocol** | Siemens XLS/Desigo/Cerberus PRO | | **Mounting** | Standard 4-inch square electrical box | --- ### 2. Key Electronic Features * **Dual Relay Functionality:** The module typically contains two independent sets of Form 'C' (SPDT) dry contacts. These can be programmed to trigger different external devices. * **Microprocessor-Based:** It uses an internal microcontroller to monitor the loop communication and manage the state of the relays, ensuring high reliability and precise timing. * **LED Indicators:** Most variants include a status LED that flashes green when communicating and stays steady red when the relays are activated. * **Built-in Identification:** The unit has an internal electronic serial number, allowing the control panel to automatically identify its location and type during the mapping process. --- ### 3. Circuit Application & Wiring The FLM-0D-R acts as a bridge between the low-voltage signaling line circuit (SLC) and high-current/voltage external equipment. #### Common Use Cases: 1. **Elevator Recall:** Sending a signal to elevator controllers during a fire event. 2. **HVAC Shutdown:** Closing air dampers or turning off fans to prevent smoke spread. 3. **Door Release:** Releasing electromagnetic door holders to compartmentalize a building. 4. **Security Integration:** Triggering third-party security systems or lighting. #### Wiring Diagram Concept: ```text [ SLC Loop (+) ] ----+---- [ FLM-0D-R ] ----+---- [ SLC Loop (+) ] [ SLC Loop (-) ] ----+---- [ Module ] ----+---- [ SLC Loop (-) ] | [ Relay Output Contacts ] (NO / NC / Common Terminals) ``` --- ### 4. Installation Considerations * **Programming:** The device must be assigned a unique address via a programming tool (like the DPU) or through the control panel menu. * **Isolation:** While the relay handles external loads, the module itself is electronically isolated from the power it switches to protect the fire alarm loop from electrical noise or surges.