The **ACB-R1** is a specialized electronic control board primarily used in access control systems, specifically designed for lift (elevator) control and floor security. It acts as an interface between user credentials (like RFID cards) and the elevator's physical floor selection buttons. --- ### Core Electronic Components The board consists of several key functional blocks: | Component Category | Part Details | Primary Function | | :--- | :--- | :--- | | **Microcontroller** | High-performance 32-bit CPU | Processes logic, manages user databases, and handles communication timing. | | **Storage (EEPROM/Flash)** | Non-volatile memory chips | Stores user access rights, schedules, and offline event logs. | | **Output Relays** | Dry contact relays (usually 16+ per board) | Physically interrupts or closes the circuit for specific elevator floor buttons. | | **Communication Interface** | RS485 / Wiegand / TCP/IP | Connects to card readers, PC management software, and other slave boards. | | **Power Management** | Voltage regulators and capacitors | Converts 12V DC input to stable internal voltages and protects against surges. | --- ### Functional Architecture The electronic design of the ACB-R1 is centered around **Relay Logic Control**. Here is how the parts interact: 1. **Input Signal:** The Wiegand interface receives data from an external RFID reader or biometric scanner. 2. **Processing:** The CPU compares the credential against the "Authorized Floor List" stored in the local memory. 3. **Relay Triggering:** If authorized, the CPU sends a signal to specific electromagnetic relays. These relays act as a bridge for the elevator's button panel. 4. **Daisy Chaining:** If the building has more than 16 floors, the RS485 port allows the ACB-R1 to connect to expansion boards (like the ACB-R16), extending control up to 64 floors or more. --- ### Technical Specifications Summary | Feature | Specification | | :--- | :--- | | **Operating Voltage** | DC 12V (±10%) | | **Current Consumption** | ~100mA (Idle) to 500mA (All relays active) | | **Relay Contact Rating** | 5A / 30V DC | | **User Capacity** | Typically 20,000 to 30,000 users | | **Event Buffer** | 50,000 to 100,000 logs | | **Operating Temperature** | -10°C to +55°C | --- ### Protection Components To ensure industrial-grade reliability, the ACB-R1 includes: * **TVS Diodes:** Protects the communication lines from Static Discharge (ESD). * **Optocouplers:** Provides electrical isolation between the logic circuit and the high-current relay outputs to prevent feedback damage. * **Status LEDs:** Visual indicators for Power, Communication (TX/RX), and Relay state.