1. Producte acabatview
This document provides detailed instructions for the Waveshare 8-Channel Ethernet Relay Module. This industrial-grade module supports Modbus RTU/TCP protocols, features Power over Ethernet (PoE) communication, and includes various isolation and protection circuits within a rail-mount case. It is designed for reliable control in diverse applications.
Figura 1: Frontal view of the Waveshare 8-Ch Ethernet Relay Module, showing Ethernet port, power input, and 8 relay channels.
2. Característiques clau
The Waveshare 8-Ch Ethernet Relay Module offers a robust set of features for industrial and automation control:
- Flash-on, Flash-off Function: Allows temporary relay activation and automatic closure via command arguments.
- Wide Range Power Input: Supports DC 7-36V and Power over Ethernet (PoE) power supply.
- MQTT Protocol Support: Enables relay control through MQTT, with an Alibaba Cloud MQTT application demo available.
- Optocoupler Isolation: Prevents interference to the relay from high-voltage circuits, enhancing safety and reliability.
- Reverse-Proof Circuit: Protects the circuit from damage due to incorrect power connection.
- High-Quality Relays: Contact rating of ≤10A 250VAC/30VDC.
- Rail-Mounted ABS Case: Provides easy installation and secure usage in industrial environments.
- Indicadors d'estat: Four LEDs and network indicators display MCU status and signal transceiving status.
Figura 2: Mésview of the module's key features and design.
3. Especificacions tècniques
Detailed specifications for the Waveshare 8-Ch Ethernet Relay Module:
| Especificació | Valor |
|---|---|
| Dimensions del producte | 5.51 x 3.54 x 1.57 polzades (145 x 90 x 40 mm) |
| Pes | 8.82 unces |
| Número de model de l'article | c7b7ab71-dab1-4503-9371-a245ac9cbace |
| Fabricant | Waveshare |
| Tipus de connector | Terminal de cargol |
| Material de contacte | Plata |
| Tipus de contacte | 1NO 1NC |
| Valoració actual | 10 Amps (≤10A 250VAC/30VDC) |
| Tipus de muntatge | Muntatge sobre carril DIN |
| Font d'alimentació | PoE port, DC 5.5*2.1 power port, or Screw terminal (7-36V) |
| Interfície de comunicació | PoE port, IEEE 802.3af compliant Ethernet |
| Canals de retransmissió | 8 |
| Protocol Modbus | Modbus RTU Protocol or Modbus TCP Protocol |
Figure 3: Detailed technical specifications and outline dimensions.
4. Configuració inicial
Follow these steps to set up your Waveshare 8-Ch Ethernet Relay Module:
4.1 Connexió a la font d'alimentació
- The module can be powered via its DC 7-36V screw terminal, a 5.5*2.1mm DC power port, or Power over Ethernet (PoE).
- If using DC power, ensure the power source is within the 7-36V range. An external 12V power supply is commonly recommended if not using PoE.
- If using PoE, connect the module to a PoE-enabled switch or injector that complies with IEEE 802.3af.
4.2 Connexió de xarxa
- Connect the module to your local area network (LAN) using a standard Ethernet cable.
- The module typically has a default static IP address, often 192.168.1.200.
- To configure the IP address or other network settings, you will need to use the dedicated configuration software provided by Waveshare. This software is usually available on the official Waveshare Wiki for the product.
- Ensure your computer's network adapter is temporarily configured to be in the same subnet as the module's default IP (e.g., 192.168.1.x) for initial access.
Figure 4: Illustration of power supply options and various configuration methods.
5. Instruccions de funcionament
The Waveshare 8-Ch Ethernet Relay Module can be controlled using various communication protocols:
5.1 Relay Control via Modbus
- The module supports both Modbus RTU and Modbus TCP protocols.
- You can send Modbus commands over the Ethernet port to control the 8 relays.
- Specific Modbus function codes and register addresses are used to read relay status or write commands to activate/deactivate relays. Refer to the Waveshare Wiki for detailed Modbus mapping.
- The flash-on/flash-off function allows you to activate a relay for a specified duration before it automatically deactivates.
5.2 MQTT Protocol Control
- The module supports control via the MQTT protocol, enabling integration with IoT platforms and message brokers.
- An Alibaba Cloud MQTT application demo is provided by Waveshare to assist with MQTT integration.
5.3 Other Communication Modes
- The module also supports TCP Server, TCP Client, UDP Mode, UDP Multicast, and HTTP for flexible integration into various systems.
6. Interfaces and LED Indicators
Understanding the module's interfaces and LED indicators is crucial for monitoring its operational status:
- Indicador RUN: This LED blinks in 2-second cycles when the Ethernet port is functioning normally, indicating network activity.
- STA Indicator: The MCU (Microcontroller Unit) status indicator blinks when the MCU is operating correctly.
- TXD Indicator: Lights up when the module is transmitting data over the network.
- RXD Indicator: Lights up when the module is receiving data over the network.
- Ethernet Port Green Indicator: Illuminates steadily when a physical network connection is established.
- Ethernet Port Yellow Indicator: Blinks to indicate data activity (transmitting or receiving) on the Ethernet port.
The relay channels are equipped with screw terminals for connecting external devices. Each relay offers Normally Open (NO) and Normally Closed (NC) contacts, along with a Common (COM) terminal.
Figure 5: Diagram illustrating the module's LED indicators and relay contact states.
7. Relay Connection Diagrams
The onboard relays have a contact rating of ≤10A 250VAC/30VDC. Always ensure power is disconnected before making any wiring connections.
7.1 AC 220V Device Connection
For connecting AC loads (e.g., lights, motors) up to 250VAC:
- Connect the AC Live (L) wire to one side of the load.
- Connect the Neutral (N) wire directly to the other side of the load.
- Connect the COM terminal of the relay to the AC Live (L) wire.
- Connect the NO (Normally Open) or NC (Normally Closed) terminal of the relay to the remaining side of the load, depending on the desired default state.
7.2 DC 30V Device Connection
For connecting DC loads (e.g., DC motors, solenoid valves) up to 30VDC:
- Connect the positive (+) terminal of the DC power supply to the COM terminal of the relay.
- Connect the negative (-) terminal of the DC power supply to one side of the DC load.
- Connect the NO (Normally Open) or NC (Normally Closed) terminal of the relay to the remaining side of the DC load, depending on the desired default state.
- Observe correct polarity for DC connections.
Figure 6: Wiring diagrams for AC and DC loads, along with the rail-mount case design.
8. Escenaris d'aplicació
The Waveshare 8-Ch Ethernet Relay Module is versatile and can be deployed in various automation contexts:
8.1 Smart Home Solutions
Integrate the module into smart home systems to control household appliances and devices remotely or automatically. Examples inclouen:
- Controlling air conditioners.
- Managing lighting systems.
- Operating door curtain motors.
- Controlling other networked devices.
8.2 Smart Agriculture Solutions
Utilize the module for automating agricultural processes and equipment, such as:
- Controlling solenoid valves for irrigation systems.
- Operating water pumps.
- Managing other motors and actuators in greenhouses or farms.
The module's industrial-grade design and robust communication protocols make it suitable for demanding environments.
Figura 7: Examples of the module's use in smart home and smart agriculture automation.
9. Pautes de manteniment
To ensure the longevity and reliable operation of your Waveshare 8-Ch Ethernet Relay Module, adhere to the following maintenance practices:
- Condicions ambientals: Operate the module within its specified temperature and humidity ranges. Keep it in a clean, dry environment, free from excessive dust, moisture, and corrosive gases.
- Ventilació: Ensure adequate airflow around the module, especially if mounted in an enclosure, to prevent overheating.
- Inspecció del cablejat: Periodically check all wiring connections (power, Ethernet, relay loads) for tightness and integrity. Loose connections can lead to intermittent operation or damage.
- Actualitzacions de firmware: Check the official Waveshare Wiki or product page for any available firmware updates. Applying updates can improve performance, add features, or resolve known issues.
- Neteja: If necessary, gently clean the exterior of the module with a soft, dry cloth. Avoid using liquid cleaners or solvents.
10. Resolució de problemes comuns
This section addresses common problems and their potential solutions:
10.1 Module Not Powering On
- Comproveu la font d'alimentació: Verify that the DC power supply (7-36V) is connected correctly and providing the specified voltage, or that the PoE source is active and compliant.
- Polaritat inversa: The module has a reverse-proof circuit, but always ensure correct polarity for DC power connections.
- Power Adapter Functionality: Test the power adapter with another device if possible to confirm it is working.
10.2 Sense connectivitat de xarxa
- Cable Ethernet: Ensure the Ethernet cable is securely connected to both the module and the network device (router/switch). Try a different cable.
- Network Device: Confirm that your router or network switch is operational and providing network access.
- Configuració de l'adreça IP: The module often defaults to 192.168.1.200. If your network is on a different subnet, you must use the Waveshare configuration software to change the module's IP address. Temporarily configure your computer's IP to match the module's subnet for initial access.
- Conflicte d'IP: Ensure no other device on your network is using the same IP address as the module.
- Indicadors LED: Check the RUN and Ethernet port green/yellow LEDs for network status.
10.3 Relays Not Responding
- Ordres de control: Verify that the Modbus RTU/TCP or MQTT commands sent to the module are correct and properly formatted.
- Connexió de xarxa: Ensure the module has active network connectivity (refer to 'No Network Connectivity' above).
- Classificació de càrrega: Confirm that the connected load does not exceed the relay's contact rating (≤10A 250VAC/30VDC).
- Cablejat: Double-check the wiring between the relay terminals (COM, NO, NC) and the load for correct connections.
- Estat del mòdul: Check the STA LED to ensure the MCU is operating normally.
10.4 Difficulty with Initial Configuration Software
- Official Software: Always use the latest official configuration software from the Waveshare Wiki for this specific module.
- Documentació: Refer to the detailed instructions and examples provided on the Waveshare Wiki, as initial setup can sometimes be complex.
- Tallafocs/Antivirus: Temporarily disable any firewall or antivirus software on your computer that might be blocking communication with the module during configuration.
11. Dimensions físiques
The module's physical dimensions are important for installation planning:
- Longitud: Aproximadament 145 mm (5.71 polzades)
- Amplada: Aproximadament 90 mm (3.54 polzades)
- Alçada: Aproximadament 40 mm (1.57 polzades)
The module is designed for convenient DIN rail mounting, facilitating integration into industrial control cabinets.
Figure 8: Detailed outline dimensions of the module for installation planning.
12. Garantia i suport tècnic
For information regarding product warranty, returns, or technical assistance, please refer to the official Waveshare website or contact their customer support directly. When seeking support, it is recommended to have your product model number (c7b7ab71-dab1-4503-9371-a245ac9cbace) and purchase details readily available.
Official Waveshare resources, including product wikis, documentation, and software downloads, are the primary source for comprehensive support and updates.
