The **E3Z-R66** is a high-performance, compact photoelectric sensor manufactured by Omron. It is a **Retro-reflective** model, meaning it requires a reflector to operate. --- ### 1. Key Technical Specifications Below are the primary electronic and physical parameters for the E3Z-R66: | Feature | Specification | | :--- | :--- | | **Sensing Method** | Retro-reflective (with MSR function) | | **Sensing Distance** | 100 mm to 4 m (using E39-R1S reflector) | | **Light Source** | Red LED (660 nm) | | **Supply Voltage** | 12 to 24 VDC ±10% | | **Current Consumption** | 30 mA maximum | | **Control Output** | NPN Open Collector | | **Operation Mode** | Light-ON / Dark-ON (Switch selectable) | | **Response Time** | 1 ms maximum | | **Connection Method** | M8 Connector (4-pin) | --- ### 2. Electronic Components & Features #### A. NPN Output Circuit The "6" in R66 signifies an **NPN output**. In this configuration, the sensor acts as a switch to the negative rail (0V). When the sensor is triggered, it sinks current from the load to the ground. #### B. MSR (Mirror Surface Rejection) The E3Z-R66 includes built-in polarizing filters. This allows the sensor to distinguish between the light reflected from the specialized reflector and the light reflected from a shiny/mirror-like object (such as a stainless steel can). It will only trigger when it sees the light depolarized by the reflector. #### C. Sensitivity Adjustment The unit features a **one-turn potentiometer**. This allows the user to fine-tune the threshold for detecting transparent or small objects, ensuring the electronic output is stable even in dusty environments. #### D. Protection Circuitry The internal electronics are protected against: * **Reverse Polarity:** Prevents damage if the VDC and 0V wires are swapped. * **Output Short-Circuit:** Protects the NPN transistor if the load shorts out. * **Mutual Interference:** Allows two sensors to be mounted close together without triggering each other. --- ### 3. Connector Pinout (M8 4-pin) Since this is the "66" version (Connector type), the wiring follows this standard: | Pin Number | Wire Color | Function | | :--- | :--- | :--- | | **1** | Brown | +V (12-24 VDC) | | **2** | White | L-ON/D-ON Control (or NC) | | **3** | Blue | 0V (GND) | | **4** | Black | Output (NPN) | ---