Study On Programmable Time Control Unit With Microcomputer Control

The inward automatic control systems or devices use a variety oftypes time control unit (hereinafter abbreviated as inward unit). It is atime control unit.It is used to control the time of start process or processcontrol recisely.Inward device is a importable product, there is no domestic units canreplace it. Once the parts with machine run out, it will directly affect thenormal operation of related equipment. a variety of this units was used inthe inward system equipment, but the demand quantity of eachspecification is relatively small.There are a lot of inconvenience to orderfrom foreign country. It is very necessary to develop Domestic timecontrol unit .Beacause domestic unit uses Programmable technology, so itis named"Programmable Time Control Unit"(hereinafter abbreviated asdomestic units).The research methods of subject. The first I will carefully analysisthe inward unit. I will take lessons useful technique and results.I digestand absorb them. We will independently develop it.We will improve thedefect of inward unit by domestic advanced and mature technology.The main results of research work were to develop domestic units.Its function and performance meets the requirements. It can substitute theinward unit. We develop a detection method.The main innovation of the domestic unit is:(1) We select the program select a program of Programmable TimeControl Unit with microcomputer. Discrete components and customsmall-scale circuit inward devices, that is improved the high level ofintegration of microcomputer-controlled solid-state relay circuit.It'spackage is sealed with a metal shell.It's timing components, that importedband device mechanical contact switch selecting mode will be improvedwith the mechanical contact of the circuit non-selection mode. Its plasticstructure parts will be improved with a metal device structure. Compared with the inward unit, the domestic unit of environmental adaptability andreliability and the quality level is significantly improved.(2) Domestic unit control time by microcomputer.It program bycomputer ,so it can achieve a variety of time controlling by the samehardware structure,that improve the product's versatility, and simplifiedproduct production, and significantly reduce the costs of hardwaredesign,and the costs of production, and the costs of using.