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hed a programming group which was responsible for developing control software (including the plc program and hmi(humanmachine interface) for the3rd phase of400,000ton grain conveying system. to develop the program, we used cimplicity of ge and controllogix of ab. mr jiao was responsible for developing the humanmachine interface program, including establishing munication point with plc, making the drawing of munication, and writing vba scripts for manual operation. because of the specialty of the control software, the progra