1. Produttu Finituview
The Waveshare Modbus POE ETH Relay is an industrial-grade 8-channel relay module designed for control via an Ethernet port. It supports both Modbus RTU and Modbus TCP protocols, offering versatile communication options. This module also features Power over Ethernet (PoE) for simplified power supply and comes housed in a durable ABS rail-mount case for easy installation in industrial environments.
Figura 1: Da cima à fondu view of the Waveshare Modbus POE ETH Relay Module, showing relay channels, Ethernet port, and power input.
2. Funzioni chjave
- 8-Channel Relay Control: Provides eight independent relay channels for controlling various devices.
- Modbus Protocol Support: Compatible with Modbus RTU and Modbus TCP protocols for industrial automation.
- Alimentazione PoE: Supports IEEE 802.3af compliant Power over Ethernet, simplifying wiring.
- Wide Voltage Input: Accepts DC 7V to 36V power input via screw terminal or DC 5.5*2.1 power port.
- Flash-on, Flash-off Function: Allows temporary relay activation with automatic deactivation after a specified duration.
- MQTT Protocol Support: Enables control through MQTT, with an Alibaba Cloud MQTT application demo available.
- Isolamentu di l'optoaccoppiatore: Onboard optocoupler isolation protects the relay from high-voltage circuit interference.
- Reverse-Proof Circuit: Integrated protection against accidental damage from incorrect power connection.
- High-Quality Relays: Contact rating of ≤10A 250VAC/30VDC, suitable for controlling home appliances or low-voltage DC devices.
- Rail-Mounted ABS Case: Durable and safe enclosure designed for easy installation on DIN rails.
- Indicatori di Status: Four LEDs (RUN, STA, TXD, RXD) and network indicators provide real-time status feedback.
3. Setup è Installazione
3.1 Opzioni di alimentazione
The module offers flexible power input methods:
- Portu PoE: Connect an IEEE 802.3af compliant PoE switch or injector to the Ethernet port.
- DC 5.5*2.1 Power Port: Use a DC 7V-36V power adapter.
- Screw Terminal: Connect a DC 7V-36V power source to the designated screw terminals.
Figure 2: Illustration of multiple power supply options including PoE, DC power port, and screw terminals.
3.2 Cunnessione di Rete
Connect the module to your network using a standard Ethernet cable. If using PoE, ensure your network equipment supports it. The module supports TCP Server, TCP Client, UDP Mode, UDP Multicast, HTTP, and MQTT communication modes.
3.3 Relay Connection
Each of the 8 relay channels provides 1 Normally Open (NO) and 1 Normally Closed (NC) contact. The common (COM) terminal is also available. Ensure that the connected load's voltage and current do not exceed the relay's contact rating of ≤10A 250VAC/30VDC.
- For AC 220V devices, connect the device in series with the COM and NO/NC terminals.
- For DC 30V devices, connect the device in series with the COM and NO/NC terminals, observing polarity if necessary for the device.
Figure 3: Wiring diagrams for connecting AC 220V and DC 30V devices to the relay contacts.
3.4 Rail-Mount Installation
The module is designed with an ABS protective enclosure for rail mounting. Simply clip the module onto a standard DIN rail in your control cabinet or enclosure.
4. Operating Instructions
4.1 Protocolli di cumunicazione
The module primarily communicates using Modbus RTU and Modbus TCP protocols. Commands are sent via the Ethernet port to control the relays.
- Modbus RTU: Typically used over serial communication, but supported over Ethernet for compatibility.
- Modbus TCP: Standard protocol for Modbus communication over Ethernet networks.
Refer to the official Waveshare documentation or development resources for detailed Modbus register maps and command structures.
4.2 Flash-on, Flash-off Function
This feature allows you to momentarily activate a relay. By passing a specific argument with the control command, the relay will turn on for a set duration and then automatically turn off. Consult the programming guide for command syntax and timing parameters.
4.3 MQTT Control
The module supports control via MQTT protocol. This enables integration with IoT platforms and cloud services. An Alibaba Cloud MQTT application demo is available for reference, demonstrating how to publish commands and subscribe to status updates.
4.4 Indicatori di Status
Monitor the module's operational status using the onboard LEDs:
- RUN (Ethernet Port Indicator): Blinks in 2-second cycles when the Ethernet port is functioning normally.
- STA (MCU Indicator): Blinks when the Microcontroller Unit (MCU) is operating normally.
- TXD (Transmit Data Indicator): Lights up when the module is sending data.
- RXD (Receive Data Indicator): Lights up when the module is receiving data.
- Ethernet Port Green Indicator: Lights up when a network connection is established.
- Ethernet Port Yellow Indicator: Blinks to indicate data activity (transmitting/receiving).
Figura 4: Detailed view of the module's interfaces and LED indicators.
5. Mantenimentu
The Waveshare Modbus POE ETH Relay module is designed for industrial reliability and requires minimal maintenance. However, adhering to the following guidelines can ensure optimal performance and longevity:
- Cundizioni Ambientali: Operate the module within its specified temperature and humidity ranges. Avoid exposure to excessive dust, moisture, or corrosive substances.
- Pulizia: If necessary, gently clean the exterior of the module with a soft, dry cloth. Do not use liquid cleaners or solvents. Ensure the device is powered off before cleaning.
- Actualizazioni di firmware: Periodically check the Waveshare official website for any available firmware updates. Follow the provided instructions carefully for any update procedures.
- Integrità di cunnessione: Regularly inspect all power and network connections to ensure they are secure and free from damage.
6. Risoluzione di prublemi
This section provides solutions to common issues you might encounter with the Modbus POE ETH Relay module.
| Prublemu | Causa Possibile | Soluzione |
|---|---|---|
| U modulu ùn s'accende micca. | Alimentazione incorrecta voltage or polarity; faulty power source; PoE not active or incompatible. | Verify power input (7-36V DC) and polarity. Ensure PoE source is active and compliant with IEEE 802.3af. Check power cables and connections. |
| No network connection (Ethernet Green LED off). | Faulty Ethernet cable; network switch/router issue; incorrect network settings. | Check Ethernet cable for damage and proper connection. Verify network switch/router status. Ensure module's network settings (IP address, subnet mask) are correct. |
| Relays not responding to commands. | Incorrect Modbus address or function code; communication protocol mismatch; software configuration error. | Confirm Modbus RTU/TCP settings and relay addresses. Verify the commands sent match the protocol specifications. Check software configuration for errors. Ensure the MCU (STA LED) is blinking normally. |
| Intermittent relay operation. | Altu voltage interference; unstable power supply; loose connections. | Ensure proper grounding. Check for strong electromagnetic interference sources. Verify power supply stability. Secure all wiring connections. |
If you encounter issues not covered here, please refer to the official Waveshare online development resources or contact technical support.
7. Specificazioni
| Parametru | Valore |
|---|---|
| Mudellu | Modbus POE ETH Relay |
| Alimentazione elettrica | PoE (IEEE 802.3af compliant), DC 5.5*2.1 port, or Screw terminal (7~36V DC) |
| Interfaccia di cumunicazione | Ethernet (PoE port) |
| Canali Relay | 8 |
| Forma di cuntattu | 1NO 1NC per channel |
| Valutazione di cuntattu | ≤10A 250VAC / 30VDC |
| Protocolu Modbus | Modbus RTU Protocol, Modbus TCP Protocol |
| Modu di funziunamentu | autumàticu |
| Dimensioni di u produttu | 5.7 x 3.54 x 1.57 inch (145 x 90 x 40 mm) |
| Pesu | 8.82 once (250 g) |
Figure 5: Outline dimensions of the module.
8. Garanzia è Support
Waveshare products are designed for reliability and performance. For specific warranty information, please refer to the official Waveshare websitu o cuntattate u vostru puntu di vendita.
For technical assistance, online development resources, and further documentation, please visit the official Waveshare support portal. If you encounter any problems or require detailed guidance, do not hesitate to contact Waveshare technical support directly.
Note: Online Development Resources and Technical Support are provided.
