Manual d'instruccions del mòdul d'entrada analògica de 8 canals Modbus RTU industrial de Waveshare

1. Producte acabatview

The Waveshare Industrial Modbus RTU Analog Input 8CH module is a high-precision data acquisition device designed for industrial applications. It supports 8 channels of simultaneous analog input with 12-bit resolution, capable of acquiring both voltage and current signals. The module communicates using the standard Modbus RTU protocol via an RS485 interface and features robust isolation and protection circuits for reliable operation in demanding environments.

Característiques principals:

• 12-bit high-precision analog acquisition.
• Supports 8 channels of simultaneous voltage i adquisició actual.
• Configurable input ranges (e.g., 0-5V, 0-10V, 0-20mA, 4-20mA).
• Standard Modbus RTU protocol over RS485.
• Wide DC 7~36V power supply input.
• Industrial-grade isolation: power isolation, magnetical isolation, resettable fuse, TVS (Transient Voltage Supressor).
• Anti-reverse protection, ESD protection, lightningproof, and anti-surge capabilities.
• Configurable device address (1~255) for multi-device cascading.
• Rail-mount case design for easy installation and stacking.
• LED indicators for RXD, TXD, and STATUS.

2. Contingut del paquet

The package contents vary slightly depending on the version of the module. Please verify your specific model.

Modbus RTU Analog Input 8CH (Standard Version):

• Modbus RTU Analog Input 8CH module x1
• Power supply terminal adapter x1

Modbus RTU Analog Input 8CH (B Version):

• Modbus RTU Analog Input 8CH (B) module x1
• Power supply terminal adapter x1
• Jumper cap 10PCS x1

Note: The power supply for this product is not included. A 12V power supply is recommended if needed.

3. Configuració

3.1 Instal·lació física

The module features a rail-mount case design, allowing for easy installation on a 35mm standard guide rail. It also supports stacking multiple modules together via screws for compact setups.

3.2 Connexions de cablejat

Refer to the interface introduction and connection diagrams for proper wiring.

• Power Supply (7-36V DC): Connect your DC power source to the 7-36V and GND terminals. The module has built-in anti-reverse protection.
• Interfície RS485: Connect the A+ and B- terminals to your RS485 host (e.g., PC or PLC). The RS485 interface is isolated for enhanced reliability.
• Analog Inputs (AI1-AI8): Connect your sensors to the respective AIx+ and AIx- terminals. The module supports single-ended or differential input.

3.3 Input Range Configuration

The module supports both voltage and current acquisition. The acquisition mode (voltage or current) is switchable via jumpers. The specific input ranges are configurable via software.

For the Modbus RTU Analog Input 8CH (Standard):

• Voltage ranges: 0~5V / 1~5V
• Current ranges: 0~20mA (default) / 4~20mA

For the Modbus RTU Analog Input 8CH (B Version):

• Voltage ranges: 0~10V (default) / 2~10V
• Current ranges: 0~20mA / 4~20mA

Consult the product's wiki for detailed instructions on jumper settings and software configuration.

4. Instruccions de funcionament

The module operates as an analog acquisition device, receiving commands via the Modbus RTU protocol over RS485 to acquire data from connected sensors.

4.1 Modbus RTU Communication

The module uses the standard Modbus RTU protocol. You will need a Modbus master device (e.g., PC with Modbus software, PLC) to send commands and read data from the module.

• Adreça del dispositiu: The module's address is configurable from 1 to 255. This allows multiple modules to be connected on the same RS485 bus.
• Velocitat de transmissió: Supported baud rates include 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000.
• Default Communication Format: 9600, N, 8, 1 (9600 baud, No parity, 8 data bits, 1 stop bit).

For detailed Modbus register maps and command structures, refer to the product's official wiki.

4.2 Indicadors LED

• RXD LED: Indica la recepció de dades.
• TXD LED: Indicates data transmission.
• LED ESTAT: Indicates the MCU's working status.

5. Manteniment

The Waveshare Modbus RTU Analog Input 8CH module is designed for industrial reliability and generally requires minimal maintenance. Ensure the module is installed in a clean, dry environment within its specified operating temperature range.

• Neteja: If necessary, gently clean the exterior of the module with a soft, dry cloth. Do not use liquid cleaners or solvents.
• Connexions: Reviseu periòdicament totes les connexions del cablejat per assegurar-vos que estiguin ben fixades i que no presentin corrosió.
• Firmware: Check the Waveshare wiki for any available firmware updates that may improve performance or add features.

6. Solució De Problemes

This section addresses common issues you might encounter with the Modbus RTU Analog Input 8CH module.

6.1 Problemes de comunicació

• No communication / RXD/TXD LEDs not blinking:
  • Verify RS485 wiring (A+ to A+, B- to B-).
  • Ensure the power supply is connected correctly and within the 7-36V DC range.
  • Check that the baud rate and communication format (parity, data bits, stop bits) on your Modbus master match the module's settings (default: 9600, N, 8, 1).
  • Confirm the module's device address is unique on the bus and matches the address used by the Modbus master.
• Incorrect data readings:
  • Verify sensor connections to the analog input terminals.
  • Check jumper settings for voltage/current acquisition mode.
  • Ensure the software-configured input range matches the sensor's output and the physical jumper settings.
  • Consult the Modbus register map on the Waveshare wiki to ensure you are reading the correct registers for analog data.

6.2 Problemes d'energia

• Module not powering on (STATUS LED off):
  • Comproveu la font d'alimentació voltage i polaritat.
  • Ensure the power supply is capable of providing sufficient current.
  • Inspect the power supply terminal adapter and connections.

7. Especificacions

8. Consells d'usuari

• Modbus Map: For integration with HMIs or other Modbus master devices, the Modbus register map is essential. Always refer to the official Waveshare Wiki for the most up-to-date Modbus map and detailed communication protocols.
• Range Configuration: Pay close attention to both the physical jumper settings and the software configuration for input ranges (voltage/current, and specific ranges like 0-5V vs 1-5V). Mismatched settings can lead to incorrect readings.
• Baud Rate Adjustment: If you need to adjust the baud rate from the default, ensure your Modbus master is configured to match the new setting. This is a common point of failure for communication.
• Font d'alimentació: While the module supports a wide voltage range, using a stable and clean power supply (e.g., a regulated 12V supply) is crucial for optimal performance and accuracy.

9. Garantia i Suport

For technical support, detailed documentation, examples, and the Modbus register map, please visit the official Waveshare Wiki:

www.waveshare.com/wiki/Modbus_RTU_Analog_Input_8CH

Waveshare provides professional technical support and rich resources including manuals and demos to assist users.