The **DL8-B-R/C02** is a specific model within the **DL8 Series** of Web Data Loggers manufactured by **M-System**. These devices are industrial-grade remote I/O modules designed to collect data from the field and transmit it via Ethernet using web-based protocols. ### 1. Technical Specifications Overview The model code "DL8-B-R/C02" can be broken down into its functional electronic components: | Component Code | Description | Electronic Function | | :--- | :--- | :--- | | **DL8** | Series Name | Web Data Logger Main Unit | | **B** | Type | Type B (Advanced functions like FTP/Email) | | **R** | Power Input | 24V DC Power Supply | | **C02** | Connectivity | Ethernet Interface (Standard RJ-45) | --- ### 2. Key Electronic Features The internal circuitry and external interfaces of the DL8-B-R/C02 are designed for high reliability in industrial environments. #### A. Communication Interfaces * **Ethernet Port:** Uses an RJ-45 connector (10BASE-T/100BASE-TX). It supports protocols such as HTTP (for the web browser interface), FTP (for data file transfer), and SMTP (for alarm emails). * **Modbus Support:** Acts as a Modbus/TCP Master or Slave, allowing it to communicate with other PLCs or sensors. * **SD Card Slot:** Includes internal circuitry for writing data to an SD card for local logging/backup. #### B. Power & Isolation * **Supply Voltage:** 24V DC (±10%). * **Dielectric Strength:** Usually rated for 2000V AC @ 1 minute (between power and ground). * **Internal Protection:** Features surge protection and noise filtering to prevent data corruption from electromagnetic interference (EMI). #### C. Input/Output (I/O) Integration While the DL8 is a communication hub, it connects to "R8 series" I/O modules via a side-connector bus. The electronics manage: 1. **Analog Inputs:** 4-20mA or 0-10V signals (converted via A/D converters). 2. **Discrete I/O:** Optoisolated inputs for status monitoring and relay outputs for control. --- ### 3. Electronic Block Diagram Logic The device operates through three main electronic layers: 1. **Processing Layer:** A high-speed microprocessor manages the embedded web server and data polling logic. 2. **Storage Layer:** Non-volatile internal memory stores configuration, while the SD card handles historical trend data. 3. **Interface Layer:** Physical PHY chips handle Ethernet communication and logic level shifting for the I/O bus. --- ### 4. Application Hardware Setup | Component | Function | | :--- | :--- | | **Internal Clock** | Real-time clock (RTC) with battery backup for timestamping data. | | **LED Indicators** | Visual diagnostics for Power, Run, Error, and Network Link/Activity. | | **DIP Switches** | Physical switches behind the front cover for setting hardware initialization or IP reset. |