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target="_blank">技术中?/a> >> <a href="/Article/ArticleList32/" target="_blank">电气百科</a> >> <span>正文</span></div> <!-- main_content begin--> <div id="dsm30mws" class="maincontent"> <!-- left begin --> <div id="dsm30mws" class="news_left"> <div id="dsm30mws" class="brand_news_details"> <h1>电气百科:PLC编程入门基础技术知?/h1><table style="border-bottom:1px dotted #e4e4e4;" align="center"><tr><td><div id="dsm30mws" class="news_mes">文章来源:【工业电器网?作者:??点击?span id="HitNum"></span>?时间?span id="dTime">2019/7/3 8:49:41</span><input type="hidden" id="ID" value="100899057"/><input type="hidden" id="TypeID" value="2"/></div> </td> <td><div id="ckepop"></div></td></tr></table><div id="Content" style="display:none;">[电气百科:PLC编程入门基础技术知识]:PLC简介可编程序控制器,英文称Programmable Controller,简称PC。但由于PC容易和个人计算机(Personal Computer)混淆,故人们仍习惯地用PLC作为可编程序控制?..</div><div id="dsm30mws" class="brand_news_con"><p style="text-indent:2em;"> PLC简?</p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> 可编程序控制器,英文称Programmable Controller,简称PC。但由于PC容易和个人计算机(Personal Computer)混淆,故人们仍习惯地用PLC作为可编程序控制器的缩写。它是一个以微处理器为核心的数字运算操作的电子系统装置,专为在工业现场应用而设计,它采用可编程序的存储器,用以在其内部存储执行逻辑运算、顺序控制、定?计数和算术运算等操作指令,并通过数字式或模拟式的输入、输出接口,控制各种类型的机械或生产过程?</p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> PLC是微机技术与传统的继电接触控制技术相结合的产物,它克服了继电接触控制系统中的机械触点的接线复杂、可靠性低、功耗高、通用性和灵活性差的缺点,充分利用了微处理器的优点,又照顾到现场电气操作维修人员的技能与习惯,特别是PLC的程序编制,不需要专门的计算机编程语言知识,而是采用了一套以继电器梯形图为基础的简单指令形式,使用户程序编制形象、直观、方便易学;调试与查错也都很方便。用户在购到所需的PLC后,只需按说明书的提示,做少量的接线和简易的用户程序编制工作,就可灵活方便地将PLC应用于生产实践?</p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> PLC的结?</p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> PLC的类型繁多,功能和指令系统也不尽相同,但结构与工作原理则大同小异,通常由主机、输?输出接口、电源扩展器接口和外部设备接口等几个主要部分组成。PLC的硬件系统结构如下图所示: </p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> PLC的工作原?</p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> PLC是采用“顺序扫描,不断循环”的方式进行工作的。即在PLC运行时,CPU根据用户按控制要求编制好并存于用户存储器中的程序,按指令步序号(或地址号)作周期性循环扫描,如无跳转指令,则从第一条指令开始逐条顺序执行用户程序,直至程序结束。然后重新返回第一条指令,开始下一轮新的扫描。在每次扫描过程中,还要完成对输入信号的采样和对输出状态的刷新等工作?</p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> PLC的一个扫描周期必经输入采样、程序执行和输出刷新三个阶段?</p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;">ݿ-ݿѯ PLC在输入采样阶段:首先以扫描方式按顺序将所有暂存在输入锁存器中的输入端子的通断状态或输入数据读入,并将其写入各对应的输入状态寄存器中,即刷新输入。随即关闭输入端口,进入程序执行阶段?</p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> PLC在程序执行阶段:按用户程序指令存放的先后顺序扫描执行每条指令,经相应的运算和处理后,其结果再写入输出状态寄存器中,输出状态寄存器中所有的内容随着程序的执行而改变?</p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;">ݿ-ݿѯ 输出刷新阶段:当所有指令执行完毕,输出状态寄存器的通断状态在输出刷新阶段送至输出锁存器中,并通过一定的方式(继电器、晶体管或晶闸管)输出,驱动相应输出设备工作?</p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> plc指令?</p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;">ݿ-ݿѯ PLC编程规则(可编程控制器梯形图?</p> <p style="text-indent:2em;"> </div><div 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