Dual Ethernet PoE 8-Channel Modbus Relay Module

This 8-channel relay module from Waveshare offers reliable control and monitoring through dual Ethernet interfaces, PoE support, and Modbus RTU/TCP protocols. Housed in a DIN-rail ABS enclosure, it’s ready for cabinet or panel installation and suits automation applications that require fast, stable, and isolated relay control.

The onboard RS-485 and dual Ethernet ports support multiple communication methods, including TCP Server, TCP Client, UDP, UDP Multicast, and MQTT. You can daisy-chain multiple devices using Ethernet cascade, and power them via PoE (802.3af) or wide-range DC input (7–36V). Modbus and MQTT support make it easy to integrate with cloud servers or other industrial systems.

Eight digital inputs support both dry and wet contact signals with bi-directional optocoupler isolation and debouncing. Each relay can be independently configured and supports a contact rating up to 10A at 250VAC or 30VDC. LEDs indicate MCU and network status, and the onboard command feature allows temporary relay toggling via argument-based control.

Built-in protections include reverse connection prevention, flyback diode protection, and signal/power isolation. Configuration is simple via software or web browser, and DHCP/DNS support streamlines integration into existing networks.

Power supply not included.

Features

• Dual Ethernet ports for communication cascade and PoE power cascade
• Flash-on/flash-off relay function via command arguments
• Supports wide range DC input (7–36V) and PoE power supply
• Relay control via MQTT protocol (includes Alibaba Cloud demo)
• Optocoupler isolation to prevent high-voltage interference
• Dedicated relay driver chip with flyback diode protection for improved stability
• Supports passive and active digital inputs with bi-directional optocoupler isolation and built-in debouncing
• Relay can be controlled via digital input linkage or toggle control
• Reverse polarity protection to prevent damage from incorrect wiring
• High-quality relays rated ≤10A at 250VAC/30VDC
• ABS DIN rail-mount enclosure for easy and secure installation
• Four status LEDs and network indicators for MCU and communication status

Specifications

Resources

• Product Wiki

Package Contents

• 1x Dual Ethernet PoE 8-Channel Modbus Relay Module

Power supply not included.