The **2VS-E2-R** is an electronic component commonly categorized under industrial automation and process control, specifically as a **Limit Switch** or **Position Sensor** unit. It is often associated with brands like SMC or similar manufacturers specializing in pneumatic and electronic control systems. --- ### ## Technical Specifications Below are the primary electronic and mechanical characteristics of the 2VS-E2-R: | Feature | Specification | | :--- | :--- | | **Component Type** | Reed Switch / Limit Switch | | **Contact Type** | Normally Open (SPST) | | **Switching Voltage** | 24V DC / 100V AC | | **Max. Current** | 50mA to 100mA (load dependent) | | **Internal Voltage Drop** | $\le$ 2.4V | | **Indicator Lamp** | Red LED (illuminates when active) | | **Wiring** | 2-wire system | | **Lead Wire Length** | Typically 0.5m to 3m (R suffix often denotes length/cable type) | --- ### ### Internal Construction The device operates on a **Magnetic Reed** principle. Here is how the electronic parts function: 1. **Reed Element:** Two ferrous blades (reeds) inside a glass envelope. When a magnet (usually on a piston or moving arm) approaches, the blades close the circuit. 2. **Protection Circuit:** Includes a resistor and often a Zener diode to protect the LED and the reed contacts from voltage spikes. 3. **LED Circuit:** A small Light Emitting Diode wired in series or parallel with the switch to provide visual feedback for troubleshooting. 4. **Encapsulation:** The internal electronics are potted in epoxy resin to protect against vibration, moisture, and dust (IP67 rating). --- ### ### Wiring Diagram Logic Since this is a 2-wire "E" type switch, it is wired in series with the load: ```text [Power Source (+)] ---- [Load/PLC Input] ---- [Brown Wire (2VS-E2-R)] | [Blue Wire (2VS-E2-R)] ---- [Power Source (-)] ``` --- ### ### Key Applications * **Cylinder Position Sensing:** Detecting the "Extended" or "Retracted" state of a pneumatic actuator. * **PLC Interfacing:** Providing digital input signals to a programmable logic controller. * **Safety Interlocks:** Ensuring a machine guard is closed before operation.