The **M2UDS-FW3-R2** is a specific electronic component within the **M2UDS series**, primarily manufactured by **M-System (now MG CO., LTD.)**. This device is a **Rotary Motion Universal Digital Alarm**, typically used in industrial automation and process control to monitor frequency or rotation speeds. --- ### 1. Key Technical Specifications The model code `M2UDS-FW3-R2` breaks down into specific hardware configurations: | Feature | Specification | Description | |:---|:---|:---| | **Model Series** | M2UDS | Universal Digital Alarm (Plug-in) | | **Input Type** | Frequency | Pulse signals from sensors (Proximity, Photoelectric, etc.) | | **Input Range** | 0.001 Hz to 100 kHz | Highly sensitive frequency detection | | **Output Type** | Relay Contact | 2-point SPDT relay outputs (Alarm 1 & Alarm 2) | | **Power Supply** | 24V DC | Indicated by the "R2" suffix | --- ### 2. Core Electronic Functions The device operates as a signal conditioner with threshold logic. Here is the electronic breakdown: * **Pulse Processing:** It accepts pulse inputs (open collector, voltage pulses, or dry contacts) and converts the time interval between pulses into a digital value. * **Dual Alarms:** It features two independent relay outputs. You can program these as "High" or "Low" alarms via the front-panel buttons. * **Isolation:** It provides 3-way isolation (Input to Output to Power). This protects the control system from electrical surges or ground loops. * **Digital Display:** The 4-digit LED display shows the current process value (e.g., RPM, Hz, or m/min) and is used for parameter configuration. --- ### 3. Connection Terminals The unit typically uses a **M3 screw terminal** base. Below is a general overview of the pin-out logic: | Terminal | Function | |:---|:---| | **1 - 2** | Power Input (24V DC) | | **3 - 4** | Input Signal (Pulse/Frequency) | | **5 - 6 - 7** | Relay Output 1 (NC - COM - NO) | | **8 - 9 - 10** | Relay Output 2 (NC - COM - NO) | --- ### 4. Common Applications * **Speed Monitoring:** Monitoring the RPM of a motor or conveyor belt. * **Flow Calculation:** Taking pulses from a flow meter to trigger an alarm if the flow rate is too high/low. * **Safety Interlocks:** Shutting down machinery if a rotational part stops unexpectedly.