The **M2UDS2-B5-R2/N** is a specific model of a **Digital Panel Meter** (Timer/Counter/Tachometer) manufactured by **Autonics**. These devices are used in industrial automation to monitor and control processes by measuring frequency, speed, or time. --- ### 1. Technical Specifications Table | Feature | Specification | | :--- | :--- | | **Series** | M2U Series (Compact Digital Meter) | | **Display Method** | 4-digit LED (Red/Green/Orange selectable) | | **Power Supply** | 100-240VAC (Standard AC range) | | **Input Type** | Pulse/NPN/PNP Input | | **Output Type** | Relay Output (Control signal) | | **Housing Size** | W72 x H36 mm | | **Operating Modes** | Timer, Counter, or Tachometer (Speedometer) | --- ### 2. Key Electronic Components & Functions The internal circuitry of the M2UDS2 series consists of several critical modules: * **Microcontroller (MCU):** The "brain" that processes high-speed input pulses and calculates the logic for timing or counting. * **Switching Power Supply (SMPS):** Converts the AC line voltage (100-240V) into low-voltage DC (typically 5V or 12V) to power the internal sensors and logic circuits. * **Optocouplers:** These are used for **Galvanic Isolation** to protect the internal electronics from high-voltage spikes or noise coming from the input sensors. * **Relay Driver:** A transistor circuit that energizes the mechanical relay when a setpoint is reached (e.g., when a count of 1,000 is hit). * **LED Driver IC:** Controls the high-brightness 7-segment display to ensure visibility in industrial environments. --- ### 3. Application Use Cases This part is commonly integrated into control panels for the following purposes: 1. **Tachometer Mode:** Measuring the RPM (Rotations Per Minute) of a motor using a proximity sensor. 2. **Counter Mode:** Counting the number of products passing through a conveyor belt using a photo-eye sensor. 3. **Timer Mode:** Managing the duration of a specific process, such as a heating cycle or a pneumatic press stroke. --- ### 4. Terminal Configuration (Internal Logic) ```text [ Power L ] ---- [ Fuse/Filter ] ---- [ SMPS ] ---- [ Internal MCU ] [ Power N ] | | [ Sensor Input ] ---- [ Optoisolator ] -------------------| | [ Relay Out ] <------ [ Relay Driver ] <------------------| ```