8 Channel PoE Ethernet Relay Module (B) with Digital Inputs

This module has eight relay channels and eight digital inputs that support passive (dry contact) and active (wet contact), making it easy to manage multiple devices simultaneously. It uses the Modbus RTU/Modbus TCP protocols, which allow integration with various systems.

It supports Power over Ethernet (PoE), making installation easy by combining power and data transmission into a single cable. For added benefit, it also supports a wide DC power input range of 7 to 36V. Placed in a sturdy ABS rail-mount case, it’s built for easy and secure mounting in industrial settings.

With its flash-on and flash-off function, you can precisely control relay timing, turning devices on for a specified duration before automatically switching them off. The module also supports relay control via the MQTT protocol, and it includes a demo for integration with Alibaba Cloud MQTT, providing cloud-based control options.

The onboard optocoupler isolation helps protect the module from interference caused by high-voltage circuits, providing stable and safe operation. This makes the module itself a solid choice for industrial environments that demand fast, stable, and secure communication.

If you are looking for a PoE ethernet relay module without digital inputs, click here to find it in our store.

Features

• Flash-on, and flash-off functions, by passing an argument to the command, it is possible to turn on the relay for a while and then close it automatically
• DC 7~36V wide range power input and PoE power supply
• Relay control through MQTT protocol, comes with Alibaba Cloud MQTT application demo
• Optocoupler isolation, prevents the relay from being interfered with by high-voltage circuit
• Dedicated relay driver chip, with built-in flyback diode protection, for stronger and more stable driving ability
• Passive and active digital input, with bi-directional optocoupler isolation, and a 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
• 4 LEDs and Network indicators for indicating the MCU status and signal transceiving status

Connection Example – Passive (Dry Contact) and Active (Wet Contact) Digital Input

Specifications

Power Supply	PoE Ethernet Port, DC 5.5*2.1 Power Port Or Power Supply Screw Terminal (7~36V)
Communication Interface	PoE Ethernet Port, Support IEEE 802.3af Standard
Relay Channels	8 Channels
Touch Contact	1NO, 1NC
Touch Contact Load	≤10A 250V AC  Or  ≤10A 30V DC
Digital Input	8DI, 5~36V, Passive Input/Active Input (NPN or PNP)
	Built-in Bidirectional Optocoupler
Modbus Protocol	Modbus RTU Protocol Or Modbus TCP Protocol

Resources

• Product Wiki

Pinout

RUN	Ethernet port indicator, blinking when the Ethernet port is normally working
STA	MCU indicator, blinking when the MCU is normally working
TXD	TX indicator lights up when sending data
RXD	RX indicator lights up when receiving data
Ethernet port Green Indicator	Lights up when the connection is established
Ethernet Port Yellow Indicator	Data activity indicator, blinking when transmitting data

Package Contents

• 1x 8-channel Ethernet Relay Module (B)