Industrial 8-channel Modbus-RTU relay module (D) with digital inputs, RS485, galvanic isolation and DIN rail mounting

Waveshare 26517 Industrial Modbus RTU 8-Channel Relay Module (D) with Digital Input and RS485 Interface, Multiple Isolation Protection Circuits, 7~36 V Power Supply

Industrial 8-channel relay module, controlled via RS485 bus, with 8-channel digital input, using the Modbus RTU protocol. It features integrated protection circuits such as current isolation, magnetic isolation, and TVS diode, among others. It also comes with an ABS enclosure. The Modbus RTU Relay (D) is very easy to use. Its fast communication, stability, reliability, and security make it the ideal choice for industrial control devices and/or applications with high communication requirements.

Features:

• Configurable device address (1~255), multiple devices can be cascaded on the RS485 bus.
  
• It features a flash-on and flash-off function. By passing an argument to the command, it is possible to turn the relay on for a specific time and then close it automatically again.
  
• Integrated unibody power supply isolation, provides stable isolated voltage, no additional power supply required for the isolated port.
  
• Integrated magnetic isolation, enables signal isolation, high reliability, strong anti-interference, low power consumption
  
• Built-in resettable fuse and TVS (Transient Voltage Suppressor), effectively suppresses overvoltages and transient voltage spikes in the circuit, provides overcurrent/overvoltage protection, lightning protection and anti-static
  
• Integrated optocoupler isolation, prevents relay interference from high-voltage circuits
  
• Uses a special relay driver chip with built-in flyback diode protection for stronger and more stable driving performance.
  
• Supports passive and active digital inputs with bidirectional optocoupler isolation and integrated debouncing algorithm. The relay supports digital input link control or toggle control.
  
• Reverse polarity protection circuit prevents accidental damage to the circuit due to incorrect connections.
  
• High-quality relay, contact load capacity: ≤10 A 250 VAC/30 VDC
  
• Rail-mounted ABS plastic housing, easy to install, safe to use
  
• Multiple LEDs to indicate MCU status and signal transmission status

Specifications:

• Power supply: 7 to 36 V
• Communication interface: RS485
• Baud rate: 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000
• Standard communication format: 9600, N, 8, 1
• Relay channels: 8
• Contact form: 1NO 1NC
• Contact strength: ≤10 A 250 VAC/30 VDC
• Digital input: 8DI, 5~36V, passive/active input (NPN or PNP), built-in bidirectional optocoupler isolation
• Communication protocol: Standard Modbus RTU protocol
• RS485 address: 1 to 255
• LED displays:
  • STA: MCU indicator, flashes continuously when the MCU is working normally
  • TXD: TX indicator, lights up when sending data
  • RXD: RX indicator, lights up when data is received

For further technical details please visit the manufacturer's product page .