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8-ch Ethernet Relay Module, Modbus RTU/Modbus TCP Protocol, PoE port Communication, With Various Isolation And Protection Circuits
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An industrial-grade 8-channel relay module controlled via Ethernet, supporting Modbus RTU and Modbus TCP protocols. Features PoE power supply (IEEE 802.3af),...
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An industrial-grade 8-channel relay module controlled via Ethernet, supporting Modbus RTU and Modbus TCP protocols. Features PoE power supply (IEEE 802.3af), optocoupler isolation, reverse-polarity protection, and a rail-mounted ABS enclosure for safe, easy installation.
Supports multiple communication modes including TCP Server/Client, UDP, HTTP, and MQTT (with Alibaba Cloud demo). Configuration is available via software or web browser. DHCP and DNS are supported for flexible network deployment.
Key Features
- 8-Channel Relay – Contact rating up to 10A 250VAC / 30VDC
- Ethernet Control – Modbus RTU and Modbus TCP protocols
- PoE Power Supply – IEEE 802.3af compliant
- MQTT Support – For IoT and cloud integration
- Flash On/Off – Timed relay control via command arguments
- Optocoupler Isolation – Prevents high-voltage interference
- Reverse-Polarity Protection – Prevents damage from incorrect wiring
- Rail-Mount ABS Case – Industrial DIN rail installation
Power Options
- PoE – IEEE 802.3af via Ethernet port
- DC Power Jack – 12V plug (adapter not included)
- Screw Terminal – 7–36V DC wide range input
Communication Modes
- TCP Server / TCP Client
- UDP / UDP Multicast
- HTTP / MQTT
- Modbus RTU / Modbus TCP
Ideal For
- Smart home automation (lighting, appliances, door curtains)
- Smart agriculture (solenoid valves, motors, water pumps)
- Industrial control systems
Package Contents
- 1× Modbus POE ETH Relay (in rail-mount case)
Note: External power supply adapter is not included. A 12V adapter is recommended if not using PoE.
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- DIN rail
- DIN rail is a standard metal mounting rail used inside industrial electrical cabinets. When a product is DIN rail mountable, it can be clipped neatly alongside power supplies, relays and other automation hardware in a panel.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- Modbus
- Modbus is an industrial communication protocol used by many meters, sensors, PLCs and automation devices. When a product lists Modbus support, it is generally easier to integrate with existing industrial equipment that speaks the same protocol.
- Modbus RTU
- Modbus RTU is a version of the Modbus protocol that runs over serial wiring, commonly RS485. When a product lists Modbus RTU, it can connect to industrial sensors, meters or drives that use serial Modbus rather than Ethernet.
- Modbus TCP
- Modbus TCP is a version of the Modbus protocol that runs over Ethernet networks. When a product lists Modbus TCP, it can connect to industrial systems that communicate over standard network cabling.
- MQTT
- A lightweight messaging protocol often used for IoT devices to publish and receive data through a server called a broker. It matters for home automation and sensor networks because it is simple, efficient, and widely supported.
- PoE
- Power over Ethernet lets one Ethernet cable carry both network data and electrical power. This is useful when installing a device where running a separate power adaptor would be difficult.
- Relay module
- A relay module uses an electrically controlled switch to let a low-power microcontroller control a separate circuit. It matters when switching devices that need different voltages or more current than a microcontroller pin can safely handle.
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