Waveshare Industrielles Modbus RTU 4-Kanal-Relaismodul (30 A Hochstrom, RS485-Schnittstelle) – Benutzerhandbuch

1. Einleitung

This manual provides detailed instructions for the Waveshare Industrial Modbus RTU 4-Channel Relay Module. This module is designed for industrial control applications, offering robust RS485 communication, high current switching capabilities, and comprehensive protection features. It is suitable for various scenarios requiring intelligent and automated control.

Bild 1.1: Überview of the Waveshare Industrial Modbus RTU 4-Channel Relay Module.

2. Hauptmerkmale

• Configurable RS485 Communication: Device address is configurable (1~255), allowing multiple devices to be cascaded on the RS485 bus for flexible networking.
• Relay Control with Flash-on/Flash-off: Supports flash-on/flash-off function, enabling relay activation for a specific period before automatically turning off via command arguments.
• Breites Volumentage Range & Isolation: Bordlautstärketage regulator supports 7V~36V wide voltage supply, with unibody power supply isolation for stable, isolated voltage ohne dass eine zusätzliche Stromversorgung für den isolierten Anschluss erforderlich ist.
• Erweiterte Schutzfunktionen: Includes onboard resettable fuse, TVS (Transient Voltage Suppressor), optocoupler isolation, and relay driver chip with flyback diode protection for surge suppression, anti-electrostatic, and high-voltage interference prevention.
• Reliable, Easy Installation: High-quality relay with a contact rating of ≤30A 250V AC or ≤30A 28V DC, housed in a rail-mounted ABS plastic enclosure with 3 LEDs to indicate MCU and signal transceiving status.
• Rich Wiki Resources: Additional resources are available on the official Waveshare Wiki.

3. Packungsinhalt

Das Paket enthält die folgenden Artikel:

• Modbus RTU Relay 4CH x1

Note: The power supply for this product is not included. A 12V power supply is recommended. A USB to RS232/485/TTL or USB to RS485 converter may be useful for testing and communication setup.

Image 3.1: Contents of the product package, showing the Modbus RTU Relay 4CH module.

4. Spezifikationen

Image 4.1: Visual representation of the module's features and technical specifications.

5. Einrichtung und Installation

5.1 Stromversorgungsanschluss

Connect a 7V to 36V DC power supply to the designated power input terminals on the module. Ensure correct polarity (+ and -). The module features an onboard voltage regulator and power supply isolation for stable operation.

5.2 RS485 Interface Connection

Connect the RS485 A+ and B- terminals of the module to your RS485 master device (e.g., a computer via a USB to RS485 converter). For multi-device setups, ensure proper cascading and consider using RS485 repeaters for long communication distances.

Image 5.1: Diagram illustrating RS485 communication setup with multiple modules and examples of AC and DC relay connections.

5.3 Relaisausgangsanschluss

Each of the 4 relay channels provides Normally Open (NO) and Normally Closed (NC) contacts, along with a Common (COM) terminal. Connect your target device (e.g., light, motor, valve) to the appropriate relay contacts based on your control requirements. The high current screw terminals are designed for secure wiring of devices up to 30A.

Abbildung 5.2: Detailansicht view of the high current screw terminals and a hardware analysis showing internal components like optocoupler isolation and TVS protection.

5.4 Schienenmontage

The module is housed in a rail-mounted ABS plastic enclosure, facilitating easy installation and removal on standard DIN rails in industrial control cabinets.

Image 5.3: Illustration of the module's interfaces, LED indicators, and its rail-mount enclosure design.

6. Bedienungsanleitung

6.1 Modbus-RTU-Kommunikation

The module communicates using the standard Modbus RTU protocol over the RS485 interface. You can send Modbus commands from a master device to control the relays and read their status. The device address is configurable from 1 to 255.

For detailed Modbus command structures and register maps, refer to the official Waveshare Wiki resources.

6.2 Relaissteuerung

Relays can be controlled individually or in groups using Modbus commands. The module supports standard ON/OFF commands. Additionally, a flash-on/flash-off function allows a relay to be activated for a specified duration before automatically deactivating.

6.3 LED-Anzeigen

• STA (Status) LED: Flashes continuously when the Microcontroller Unit (MCU) is operating normally.
• TXD (Transmit) LED: Lights up when the module is sending data over RS485.
• RXD (Receive) LED: Lights up when the module is receiving data over RS485.

These indicators provide visual feedback on the module's operational status and communication activity.

6.4 Example of Modbus Control

The following video demonstrates the Modbus RTU Relay series, including connection and basic operation using Modbus commands. This can serve as a practical guide for controlling the module.

7. Anwendungen

The Waveshare Modbus RTU Relay Module is versatile and can be applied in various fields:

• Industrielle Steuerung: Ideal for valve control, pump station control, and unattended industrial control systems.
• Intelligentes Zuhause: Suitable for controlling appliances like air conditioners, access control systems, purifiers, and water heaters.
• Intelligente Landwirtschaft: Can be used for controlling door curtain motors, air blowers, and other agricultural equipment.
• Breeding & Farming: Useful for controlling ventilators, lighting, water supply systems, and feeding systems in breeding and farming environments.

Abbildung 7.1: Beispielamples of diverse applications for the Modbus RTU Relay Module.

8. Wartung

The Waveshare Modbus RTU Relay Module is designed for reliable operation with minimal maintenance. To ensure longevity and optimal performance:

• Halten Sie das Modul sauber und frei von Staub und Schmutz.
• Bei Installation in einem geschlossenen Raum ist für ausreichende Belüftung zu sorgen.
• Überprüfen Sie regelmäßig alle Kabelverbindungen auf festen Sitz und Unversehrtheit.
• Avoid exposing the module to extreme temperatures or humidity beyond its specified operating conditions.

9. Fehlerbehebung

If you encounter issues with your Modbus RTU Relay Module, consider the following troubleshooting steps:

• Kein Strom/LEDs aus: Überprüfen Sie die Lautstärke der Stromversorgungtage (7-36V) and ensure correct polarity. Check power connections.
• Kommunikationsfehler:
  • Check RS485 wiring (A+ to A+, B- to B-).
  • Confirm baudrate, data bits, parity, and stop bits settings match between the master device and the module (default: 9600, N, 8, 1).
  • Ensure the device address is correctly configured and unique on the bus.
  • Check for proper termination resistors on the RS485 bus if applicable (not explicitly mentioned for this module, but good practice for RS485).
  • Observe TXD/RXD LEDs for data transmission activity.
• Relais aktiviert nicht:
  • Verify the Modbus command sent is correct for the desired relay and action.
  • Check the load connected to the relay for proper wiring and functionality.
  • Ensure the load current and voltage do not exceed the relay's contact rating (≤30A 250V AC or ≤30A 28V DC).
• Modulüberhitzung: Ensure adequate ventilation around the module. Reduce load if consistently operating at maximum capacity.

For further assistance, consult the Waveshare Wiki or contact technical support.

10. Garantie und Support

For detailed warranty information, please refer to the official Waveshare website or the documentation provided with your purchase. Waveshare provides comprehensive resources and support for its products.

• Online-Ressourcen: Visit the official Waveshare Wiki for detailed documentation, examples, and software resources. The Wiki is a primary source for technical information.
• Technische Unterstützung: For specific technical inquiries or issues not covered in this manual or the Wiki, please contact Waveshare customer support through their official channels.