| Zhongtian printing machine is a multifunctional intermittent label printing machine, a kind of real-time, accuracy and reliability of intelligent automation equipment, and the Mitsubishi PLC is used as the control center in Zhongtian printing machine. The thesis designs the module required in the Zhongtian printing control system, such as:gateway, input/output modules, Instead of the original products which buy from Mitsubishi, Significantly reduced the cost of production.Firstly, the thesis conducted the overall design of control system of Zhongtian printing machine, including hardware and software design.In the hardware design of Zhongtian printing control system, mainly completed:The overall scheme of the gateway module, Analog input/output modules overall scheme design, Digital input/output modules overall scheme design, Power supply circuit, RS485circuit, Address recognition circuit, Reset circuit, Crystal oscillator circuit, ADC circuit, DAC circuit, Output voltage filter protection circuit, Dedicated output circuit chip, Microcontroller circuit, isolation circuit.Completion of the Zhongtian printing control system software design, mainly include: Interactive communication between the gateway module and input/output modules, Gateway module initialization, Gateway module for input/output modules basics diagnostic interface implementation, Digital input/output module initialization, Analog input/output module initialization, Analog output module data output, Analog input module data acquisition, DAC8555chip four-channel loop outputs, ADS8331chip four-channel cycle acquisition, Gateway module for input/output modules configuration interface implementation, Analog Input Module Data filtering implementation, And by filtering algorithm to achieve analog input module data accuracy.At last, the joint-test alignment has carried on the hardware and software, Analog output module and Analog input module data accuracy was tested, and the test results are analyzed and summarized. |
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