What is LabVIEW？

LabVIEW is a graphical programming software developed by National Instruments (NI). It provides an intuitive way to design measurement and control systems and is widely used in scientific research, engineering design, industrial automation and other fields. LabVIEW uses a graphical programming language G (Graphical Language), which allows users to quickly build applications by dragging icons and connecting lines, thereby simplifying the development process of complex systems.

What is Modbus?

Modbus is an open standard serial communication protocol, originally introduced by Modicon (now part of Schneider Electric) in 1979, for connecting industrial electronic equipment. It is widely used in industrial automation systems as a means of communication between master devices (such as PLCs) and slave devices (such as sensors and actuators). Modbus supports multiple physical layer protocols, including RS-232, RS-485, etc., and also supports TCP/IP networks.

The Modbus protocol defines a series of standard message structures that can be used to request or send data. The two most common data types are Coil Status and Holding Registers. Through these data types, Modbus can query the status of remote devices and control operations.

The biggest advantage of using LabVIEW to collect Modbus data is that its graphical programming environment greatly simplifies the development process. Built-in Modbus support and wide hardware compatibility make data acquisition more efficient and flexible. At the same time, powerful error handling capabilities and cross-platform compatibility ensure the stability and portability of the system.

How to collect Modbus data with LabVIEW?

Preparation

• Install LabVIEW: ARM industrial computer has LabVIEW software installed.
• Prepare Modbus device: Make sure the Modbus device is correctly configured and connected to the computer or network.

Programming

• Select Modbus library: LabVIEW provides a built-in set of Modbus functions, which can be found in the function palette. In addition, you can also consider using third-party toolkits, such as MCC Modbus Toolkit.
• Configure Modbus communication: Use the Modbus configuration function in LabVIEW to set communication parameters, including serial port, device address, baud rate, etc.
• Read register data: Use the Modbus Read Holding Registers function to read register data on the Modbus device.
• Write register data: If necessary, you can also use the Modbus Write Holding Register function to modify the register value on the device.

Testing and debugging

• Simulation test: Before actual deployment, you can use simulation equipment for preliminary testing.
• Field test: Connect the program to the actual Modbus device for testing to ensure that data collection is accurate.

Conclusion

In conclusion, using LabVIEW to collect Modbus data can not only improve development efficiency, but also ensure the accuracy and stability of data acquisition. LabVIEW is an indispensable tool in the field of industrial automation. By making full use of its advantages, a high-performance and reliable data acquisition system can be built.

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