Automatic control of mechanical facility has replaced manual work step by step . plc is a late - model automatic equipment . its development is based on computer technology , automatization technology and communications 可编程序控制器（ plc ）是以微处理器为核心，综合计算机技术、自动化技术和通信技术发展起来的一种新型工业自动控制装置。
The design guiding principle , working mechanism and selected parts of the automatic pulp - level control device for the sulphur concentrate in huangshaping lead - zinc mine , hunan province and its functions , operation and economical effect are described 介绍湖南黄沙坪铅锌矿硫精矿矿浆液位自动控制装置的设计指导思想、工作原理、选用的部件及其功能、运行情况和所取得的经济效益。
Based on the strategy the automatic voltage and reactive power control device was developed . the device is controlled by microcomputer and can adjust the ratio of transformer and switch the capacitor automatically according to operating condition 在此基础上，研制成功了变电所电压无功自动控制装置，装置以微处理器为控制核心，可根据实测的母线电压和负荷功率因数，自动进行主变分接头调整和补偿电容器投切。
With new products is produced fast , period is shorten , manpower and material resources is increased . both test institutions and enterprises are eager to have a operation reliability test autocontrol device according with related standard and criterion , this equipment has reliable properties , easy to operated , can reduce labor intensity and raise labor productivity 随着新产品开发的速度不断加快，周期缩短，人力物力投入加大。无论是试验机构还是生产企业都渴望拥有一套性能可靠、使用方便，既能减轻劳动强度又能提高效率，并符合有关标准规范要求的作业可靠性试验自动控制装置。
Based on the demand of power department , a full distributed multifuncitional monitoring device is studied . this instrument not only can measure the data of hydroelectric plant , but also integrate the funcition of control the dynamotor , by cooperate with the program of epigynous system , it can realization the auto generate electricity on the hydroelectric plant and ordinal startup - stop of the dynamotor . 2 furthermore , performance of integrated dft arithmetic enhances the acturacy and reliability of measure . by communication several devices can run online to be controlled dispersedly and managed centrally 本文分析了国内外水电站自动控制装置的研究和发展状况，尤其是国内小型水电站的自动化现状，针对现有电力部门的需求，设计并实现了一种单元式的微机自动监控装置，该装置不仅实现了对水电站内各种模拟参数和数字信号的实时监测功能，还对水轮发电机组进行了调控，通过与上位机处理程序的配合，可以实现水电站的自动发电控制、机组顺序启停；在测量发电机组机端电压和电流参数的时候，采用32点离散傅立叶算法( dft ) ，增加了测量的准确性和可靠性；通过通讯可以实现装置的联网运行，做到“分散控制、集中管理” 。
Programmable controller ( plc ) is one of the most important electronic controller at the industry autocontrol . programmable controller is a device of the automatic controller , the growth of the technology with the computer , communication , microprocessors and autocontrol 可编程控制器: programmablecontroller ,是以微处理机为基础,综合了计算机技术、自动控制技术和通信技术等现代科技而发展起来的一种新型工业自动控制装置,是将计算机技术应用于工业控制领域的新产品。
During the heat accumulator supplying to users , the electric boiler usually try to make heat by starting at low price of electric and stopping at high . in general , the system of electric boiler with heat accumulator runs according to experience to utilize the time - of - use electricity price or controlled by the signals of water level or temperature 当前运行的蓄热式电锅炉供热系统中电锅炉的启停控制一般有两种方式：一种是根据分时电价和用户热负荷由人工启停，另一种是根据蓄热器的水位或水温信号由自动控制装置启停。
