The **W2SP-2DA-R2/Q** is a high-precision, space-saving signal conditioner (specifically a **Digital-to-Analog Converter/Transducer**) manufactured by **M-System**. It is part of the W2SP series, designed to convert digital communications into isolated DC output signals. --- ## 1. Core Specifications & Electronics The electronic architecture of this module focuses on **signal isolation** and **precision conversion**. | Feature | Specification | |:---|:---| | **Primary Function** | 2-channel Digital-to-Analog Conversion | | **Power Input** | 24V DC (approx. 80mA) | | **Output Type** | DC Voltage or Current (Factory calibrated per suffix) | | **Isolation** | 2000V AC @1 minute (Input to output to power to ground) | | **Communication** | Modbus-RTU (RS-485) | | **Mounting** | DIN Rail Mounting | --- ## 2. Key Electronic Components & Subsystems ### A. Microprocessor Control The "brain" of the unit handles the **Modbus-RTU protocol** stack. It receives digital values via the RS-485 interface and processes them into a format suitable for the internal D/A converter. ### B. Dual-Channel Isolation The module uses **Optical or Magnetic Isolation** between the input (communication), the power supply, and the two output channels. This prevents ground loops and protects the PLC/Controller from high-voltage surges on the field side. ### C. Digital-to-Analog (D/A) Conversion The unit features high-resolution converters (typically 12-bit or higher) that transform digital data into precise analog steps. The `/Q` designation often indicates a **Special Specification** (such as specific coating, customized calibration, or fast response times). --- ## 3. Terminal Connection Map The module uses a tension-clamp or screw terminal system for wiring. | Terminal No. | Function | Description | |:---:|:---|:---| | **1 – 2** | **Output 1** | Analog signal (+) and (-) | | **3 – 4** | **Output 2** | Analog signal (+) and (-) | | **5 – 6** | **RS-485** | A (+) and B (-) Communication lines | | **7 – 8** | **Power** | 24V DC Input | --- ## 4. Usage Considerations * **Termination Resistor:** Since it uses RS-485, ensure the end-of-line unit has a 110–120Ω resistor enabled. * **Response Time:** The electronics are tuned for a response time of approximately **≤ 0.5 seconds** (0 to 90% signal). * **Temperature Compensation:** Internal circuitry includes drift compensation to maintain accuracy within **±0.1%** across the operating temperature range (typically -5°C to +55°C).