The **IM1-22EX-R** is a high-performance, 2-channel isolating switching amplifier manufactured by **Turck**. It is designed to act as an interface between sensors located in hazardous (Ex) areas and control systems in safe areas. --- ## 1. Core Technical Specifications | Feature | Specification | | :--- | :--- | | **Channels** | 2-Channel | | **Supply Voltage** | 20…250 VAC / 20…125 VDC | | **Input Signals** | NAMUR Sensors or Mechanical Contacts | | **Output Type** | 2 x Relay (Changeover/SPDT) | | **Switching Frequency** | ≤ 10 Hz | | **Mounting** | DIN Rail (35 mm) | | **Protection Class** | IP20 | --- ## 2. Key Electronic Components & Functions ### A. Input Stage (Ex-Side) The device is intrinsically safe. It provides a current-limited and voltage-limited signal to sensors located in potentially explosive atmospheres. - **NAMUR Compatibility:** It monitors the current consumption of the sensor (approx. 1mA vs 2.2mA) to determine "ON" or "OFF" states. - **Line Monitoring:** It features integrated wire-break and short-circuit detection. ### B. Galvanic Isolation This is the "core" electronic function of the IM1-22EX-R. It provides 3-way isolation between: 1. **Input and Output** 2. **Input and Power Supply** 3. **Output and Power Supply** This prevents high-voltage surges from the power grid or the control side from reaching the hazardous area. ### C. Output Stage (Relays) The output utilizes **Electromechanical Relays**. - **Contact Type:** Changeover (SPDT) contacts. - **Switching Capacity:** Typically up to 250 VAC / 2 A. - **Mode Selection:** Users can configure the output behavior (Normally Open or Normally Closed) via DIP switches on the front of the unit. --- ## 3. Configuration & Diagnostics The device features physical switches and LED indicators to manage electronic logic: 1. **DIP Switches:** * **NO/NC:** Selects the output relay logic (Normally Open or Normally Closed). * **LM:** Activates or deactivates Line Monitoring (error detection). 2. **LED Status Indicators:** * **Green:** Power supply is active. * **Yellow:** Status of the output relay (Channel 1 and 2). * **Red:** Error detected (Wire-break or Short-circuit). --- ## 4. Wiring Diagram Overview ```text [ Hazardous Area ] <----------> [ Safe Area ] NAMUR Sensor 1 ----| 1 2 |---- Relay Output 1 NAMUR Sensor 2 ----| 3 4 |---- Relay Output 2 | | | Power|---- 20...250 VAC/VDC ```