基于PLC的温度监控系统设计.doc

基于PLC的温度监控系统设计
摘要:可编程逻辑控制器(PLC)被研制成大约在1968年。PLC是一种固态电子装置,它利用已存入的程序来控制机器的运行或工艺的工序。PLC 通过输入/输出(I/O)装置发出控制信号和接受输入信号。由于PLC综合了计算机和自动化技术,所以它发展日新月异,大大超过其出现时的技术水平。它不但可以很容易地完成逻辑、顺序、定时、计数、数字运算、数据处理等功能,而且可以通过输入输出接口建立与各类生产机械数字量和模拟量的联系,从而实现生产过程的自动控制。特别是超大规模集成电路的迅速发展以及信息、网络时代的到来,扩展了PLC的功能,使它具有很强的联网通讯能力,从而更广泛地应用于众多行业。本文所涉及到的温度监控系统能够监控现场的温度,并且能够现场控制和通过计算机控制。
关键词:PLC 编程语言温度
Design of the temperature supervisory system based on PLC
Abstract: The programmable logic controller (PLC) was developed in 1968. PLC is a solid-state device used to control machine motion or process operation by means of a stared program .The PLC sends output control signals and receives input signals through input/out (I/O) devices. PLC design is for bad industrial environmental use. Because of puter and automatic technology, make its development change with each passing day, exceed the engineering level while it appears greatly. It can finish logic, order, timing, count, digital operation, data processing, etc. function very easily, and can establish with all kinds of connection with analog quantity of amount of mechanical figure produced through the input-output interface, thus realize the automatic control of the production process. Especially the rapid development, information, arrival of cyber times of the very large scale integration, expanded the function of PLC, makes it have very munication ability, thus wide