Waveshare 8-CH Modbus RTU Relay Module (D) Industrial Automation Relay Module with Digital Input and RS485 Interface, Wide 7-36V Power Supply for PLC Control

Description:

The Waveshare Industrial Modbus RTU 8-Channel Relay Module (D) is an advanced, industrial-grade solution designed for reliable automation and control. Equipped with 8 relay output channels, digital input ports, and an RS485 communication interface, it enables seamless integration into PLC systems and other industrial control setups.

Supporting the Modbus RTU protocol, this module ensures efficient and stable serial communication, even over long distances—ideal for complex industrial environments. The multi-isolation protection circuits, including optocouplers and surge protection, offer strong resistance to electrical interference and transient voltages, ensuring stable and secure operation.

With a wide 7–36V DC power supply range, the module adapts easily to various power systems, providing flexibility and compatibility across diverse applications. Its robust design and reliable performance make it suitable for industrial control, remote monitoring, building automation, and other demanding use cases.

Whether you're building a factory automation system or enhancing a PLC setup, the Waveshare Modbus RTU 8-CH Relay Module (D) delivers dependable performance, high-level protection, and versatile connectivity in one powerful package.

Specification:

• Power supply: 7~36V
• Communication interface: RS485
  
• Baudrate: 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000
  
• Default communication format: 9600, N, 8, 1
  
• Relay channels: 8
  
• Contact form: 1NO 1NC
  
• contact rating: ≤10A 250VAC/30VDC
  
• Digital input: 8DI, 5~36V, passive/active input (NPN or PNP), built-in bi-directional
• optocoupler isolation
  
• Communication protocol: Standard Modbus RTU protocol
  
• RS485 address: 1~255
  
• LED indicators: 
               STA: The MCU indicator keeps flashing when the MCU is normally working
               TXD: TX indicator, lights up when sending data
               RXD: RX indicator, lights up when receiving data

Features:

• Configurable device address (1~255), multiple devices can be cascaded on the RS485 bus
• Features flash-on, flash-off function, by passing an argument to the command, it is possible to turn on the relay for a while and then close it automatically
• Onboard unibody power supply isolation provides a stable isolated voltage, and needs no extra power supply for the isolated terminal
• Onboard unibody magnetic isolation allows signal isolation, high reliability, strong anti-interference, and low power consumption
• Onboard resettable fuse and TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, provides over-current/over-voltage proof, lightningproof anti-electrostatic
• Onboard Optocoupler isolation prevents the relay from being interfered with by high-voltage circuits
• Adopts dedicated relay driver chip, with built-in flyback diode protection, for stronger and more stable driving ability
• Supports passive and active digital input, with bi-directional optocoupler isolation, built-in debouncing algorithm. The relay supports digital input linkage control or toggle control
• Reverse-proof circuit prevents the circuit from being damaged accidentally by incorrect connection
• High quality relay, contact rating: ≤10A 250VAC/30VDC
• Rail-mounted ABS plastic enclosure, easy to install, safe to use
• Multiple LEDs for indicating the MCU status and signal receiving status

Product Interface:

Applications:

Package Includes:

• 1 x Modbus RTU Relay (D)
• 1 x Screwdriver