in recent years because the electron flies technically to develop soon, the extensive application of the computer control, the local market puts forward the new request to the technique performance and reliabilities of the refrigerant compressor and the refrigerating system electricity control fraction again, because the plc has the volume small, the function is strong, the reliability higher -, maintain the convenience and be easy to control etc. advantage, therefore, adopted this kind of run - time of plc in the machine set and system designs firm, high sex price than of, the configuration of system is vivid and produces the debug simple, forerunner of control device replace the relay.the here mainly introduced the cold library control system that our group create, the s7 series plc and the wincc configuration softwares of the usage siemens company carry on the application of the automatic control according to the profibus electric mains.among them, we use the pt100 to be the temperature transducer,temperature sensor to carry on the temperature measurement, s7-200 and it expands the module em253 to carry on input output and its pid controls that imitates the quantity.
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plc profibus wincc pid control作者: 枫使者 时间: 2006-6-1 10:56
