The **M2UDS-C1-R** is a specific model within the M2UDS series of **Digital Speed Indicators** (Tachometers) manufactured by **Autonics**. These devices are primarily used to measure and display the rotation speed (RPM) or peripheral speed of motors and machinery. Below is a breakdown of its technical specifications and electronic components. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Model Number** | M2UDS-C1-R | | **Input Type** | Pulse (Contact, NPN Open Collector, Voltage Pulse) | | **Display Method** | 4-digit LED (Red) | | **Power Supply** | 100-240VAC 50/60Hz | | **Max. Input Frequency** | 10kHz (Solid-state), 30Hz (Contact) | | **Prescale Function** | Supported (Converts pulses to RPM/m/min) | | **Operating Temp** | -10°C to 50°C | --- ### 2. Core Electronic Components & Functions The M2UDS-C1-R consists of several internal electronic stages that process signals from industrial sensors: #### A. Input Circuitry (Signal Conditioning) * **Optocouplers:** Used to isolate the sensitive internal logic from electrical noise coming from the input sensors (Proximity sensors, encoders). * **Schmitt Trigger:** Squares off irregular pulse signals into clean square waves for the CPU to process accurately. #### B. Processing Unit (MCU) * **Microcontroller:** The "brain" of the unit. It measures the interval between incoming pulses or counts pulses over a fixed gate time. * **EEPROM:** Stores the user-defined "Prescale" values and settings so they are not lost during power failure. #### C. Power Supply Section * **Switching Mode Power Supply (SMPS):** Converts the AC input (100-240V) into low-voltage DC (usually 5V and 12V) required by the internal chips and the external sensor. * **Sensor Power Output:** Provides a DC power source (typically 12VDC 50mA) to power the connected proximity or photo sensor directly. #### D. Display Driver * **LED Driver IC:** Controls the high-brightness 7-segment red LED display. It uses multiplexing to cycle through the 4 digits rapidly to reduce power consumption. --- ### 3. Wiring Configuration To function, the electronic terminals are usually mapped as follows: 1. **Power Input:** Terminals for the AC line (L, N). 2. **Sensor Input:** Terminals for Signal (IN), Power Out (+12V), and Ground (0V). 3. **Hold/Reset:** Electronic inputs to pause the display or clear the current reading. --- ### 4. Application Logic The device operates on the formula: `Display Value = Input Frequency × Prescale Value` This allows the electronic parts to translate a pulse from a gear tooth into a meaningful value like "Meters per Minute" or "Rotations per Minute."