Modbus is a bus protocol published by Modicon Corporation (now Schneider Electric) in 1979 for communication using programmable logic controllers (PLCs).
Simplicity is the main reason why Modbus is so common.
Message checking is another reason why Modbus is so popular. CRC and LRC checks mean an accuracy rate of 99% in detecting transmission errors.
Modbus has become the industry standard for communication protocols in the industrial field and is now a commonly used connection method between industrial electronic devices (an industry specification). In addition, it also has three major characteristics:
① Publicly published without copyright requirements
② Easy to deploy and maintain
③ There are not many restrictions on modifying local bits or bytes for mobile devices
In summary, Modbus is a protocol used for industrial control, characterized by three main features: free to use, easy to learn, and convenient to modify. It has been widely used.
This protocol supports traditional RS-232, RS-485, RS-422, and Ethernet devices. Many industrial equipment, including PLCs, DCS, smart meters, frequency converters, etc., are using Modbus protocol as their communication standard. With it, control devices produced by different manufacturers can be connected to an industrial network for centralized monitoring.
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