The **M2REB-SA4-R/N** is a specialized industrial sensor, typically categorized as a **photoelectric sensor** or a **laser sensor** (often associated with the Omron or specialized industrial automation lines). These components are designed for high-precision detection in automated environments. --- ### 1. Technical Specifications Overview Below is a breakdown of the typical electronic and physical specifications for this series: | Feature | Specification Details | | :--- | :--- | | **Sensing Method** | Retro-reflective or Background Suppression (BGS) | | **Supply Voltage** | 10 to 30 VDC (includes 10% ripple) | | **Current Consumption** | Approx. 20mA - 35mA | | **Output Type** | PNP or NPN Open Collector (Depending on model suffix) | | **Response Time** | < 1ms (High-speed detection) | | **Light Source** | Red LED or Laser Diode | | **Connection Type** | M8 Connector (4-pin) or Pre-wired cable | --- ### 2. Key Electronic Components The device is comprised of several internal electronic stages that allow it to function as a reliable switch: #### A. The Emitter (Light Source) * **Component:** High-intensity Red LED or Class 1 Laser. * **Function:** Projects a focused beam of light toward a target or a reflector. * **Electronic Control:** Managed by a pulsed oscillator circuit to differentiate the sensor's own light from ambient light (preventing interference). #### B. The Receiver (Photodiode) * **Component:** Photodiode or Phototransistor. * **Function:** Captures the reflected light. It converts the optical signal into a proportional electrical current. #### C. Signal Processing (ASIC/Comparator) * The raw electrical signal from the receiver passes through an internal **Operational Amplifier (Op-Amp)**. * A **Comparator circuit** checks the signal strength against a predefined threshold (set via a potentiometer or "Teach" button). * If the threshold is met, it triggers the output logic. #### D. Output Stage (Transistor Logic) * **NPN/PNP Transistor:** Acts as the solid-state switch. * **Protection:** Usually includes Reverse Polarity Protection and Short-Circuit Protection to prevent damage if wired incorrectly. --- ### 3. Wiring Configuration (M8 Connector) For the **SA4** variant, which typically denotes an M8 4-pin connector, the pinout is generally standard: | Pin Number | Color | Function | | :---: | :--- | :--- | | 1 | Brown | +V (Positive Supply) | | 2 | White | Control/Alarm (Optional) | | 3 | Blue | 0V (Negative Supply) | | 4 | Black | Output (Signal) | --- ### 4. Operational Modes * **Light-ON:** The output is active when the receiver detects light. * **Dark-ON:** The output is active when the beam is broken (interrupted). * **Stability Indicator:** Often features a Green LED (stability) and an Orange LED (operation) to provide visual electronic feedback on the alignment quality.