The Waveshare Industrial Modbus RTU 8-ch Relay Module (D) is a robust and versatile solution for industrial control applications that demand high communication reliability and safety. This module features eight relay channels, controlled via the RS485 bus utilizing the Modbus RTU protocol, ensuring fast and stable communication. It’s equipped with multiple embedded protection circuits, including power isolation, magnetic isolation, and TVS diode protection, which enhance the module’s resilience against electrical disturbances and ensure long-term operational stability.

One of the standout features of this relay module is its configurable device address range (1~255), allowing multiple devices to be cascaded on a single RS485 bus. This makes it highly scalable and suitable for complex industrial setups. The module also includes a flash-on, flash-off function, which allows the relays to be automatically turned on and off for a specified duration, enhancing control flexibility.

The onboard unibody power supply isolation and magnetic isolation ensure stable voltage supply and signal integrity, reducing power consumption and boosting reliability. Additional safety is provided by the onboard reset table fuse and TVS, which protect against surge voltages, over-current, and transient spikes. The inclusion of optocoupler isolation prevents interference from high-voltage circuits, further safeguarding the relay module.

Housed in a durable ABS plastic enclosure, the module is designed for easy rail mounting, making it simple to install in various industrial environments. The high-quality relays can handle contact ratings up to 10A at 250VAC/30VDC, making this module a reliable choice for controlling industrial equipment with stringent safety and communication requirements.