All-in-one machine through combination of HMI and PLC functions and communication method thereof

Abstract

The present invention discloses an all-in-one machine through combination of HMI and PLC functions and a communication method thereof. The all-in-one machine comprises a PLC module, an HMI module, a first SPI interface and a second SPI interface. The first SPI interface is connected with the PLC module and the HMI module, and the second SPI interface is connected with the HMI module and the PLC module. The method comprises the steps of: initiating communication from a first host, and transmitting communication data to a first slave through the first SPI interface; initiating communication froma second host, and transmitting communication data to a second slave through the second SPI interface, wherein the communication data meets an ModBus protocol and does not comprise function codes andslave station numbers. The two SPI interfaces are provided at the aspect of hardware to achieve two-way transmission of the data with no need for differentiating 'reading' or 'writing-in', and the data transmission efficiency can be doubled; and moreover, optimized data frames are employed at the aspect of software to reduce the number of bytes in the transmission of the data frames so as to improve the communication rate and totally achieve the purpose of improving the communication efficiency of the all-in-one machine through combination of the HMI and the PLC.

Description

technical field [0001] The invention relates to an industrial control all-in-one machine, in particular to an all-in-one machine combining HMI and PLC functions and a communication method. Background technique [0002] In the field of industrial control, a programmable logic controller (PLC) is a digital operation operating system specially used in an industrial environment to control various types of mechanical equipment or production processes through digital or analog input and output; Human-machine interface (HMI) is the medium for interaction and information exchange between the system and users. It can easily realize the interaction between human and machine information. In the field of industrial control, HMI is often used in conjunction with PLC. In the existing all-in-one HMI For communication with PLC, the general ModBus communication protocol based on USART serial port communication is often used. It is a recognized communication standard. As a general standard, i...

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Problems solved by technology

[0002] In the field of industrial control, a programmable logic controller (PLC) is a digital operation operating system specially used in an industrial environment to control various types of mechanical equipment or production processes through digital or analog input and output; Human-machine interface (HMI) is the medium for interaction and information exchange between the system and users. It can easily realize the interaction between human and machine information. In the field of industrial control, HMI is often used in conjunction with PLC. In the existing all-in-one HMI For communication with PLC, the general ModBus communication protocol based on USART serial port communication is often used. It is a recognized communication standard. As a general standard, it has the advantage of strong versatility, but it is used in integrated HMI and PLC functions. On the all-in-one machine, the communication rate is not fast enough and the efficiency is not high

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