Abstract
By analyzing the current serial communication design used in a popular monitor system composed of PC, GOT and PLC, introduced a new design and implementation plan of serial communication based on Vb and MX software pagekage. This system could solve the problem of managing complex communication protocol in current application, and achieved the efficient, stable and reliable communication under simple attachment. The system could not only have not to consider complex communication protocol but also need not to set up the D8120 PLC, and MX Component with other application such as GX Developer could use com port at the same time, so debug conveniently and programming high efficiency. In the actual application, No matter the accuracy and stability of communication were to achieve achieve industrial control system requirements.
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