IC693MDL930

描述

IC693MDL930

PLC可以支持数控机床的控制和管理，在机械加工行业，可编程控制器与计算机数控（CNC）集成在一起，用以完成机床的运动位置控制，它的功能是接受输入装置输入的加工信息，经处理与计算，发出相应的脉冲给驱动装置，通过步进电机或伺服电机，使机床按预定的轨道运动，以完成多轴伺服电机的自控。目前以用于控制无心磨削、冲压、复杂零件分段冲裁、滚削摸削等应用中。PLC可以通过通迅接口与显示终端和打印机等外设相连。显示器作为人机界面（HMI）是一种内含微处理芯片的智能化设备，它与PLC相结合可取代电控柜上众多的控制按钮、选择开关、信号指示灯，及生产流程模拟屏和电控柜内大量的中间继电器和端子排。所有操作都可以在显示屏上的操作元件上进行。PLC可以方便、快捷地对生产过程中的数据进行采集、处理，并可对要显示的参数以二进制、十进制、十六进制、ASCII字符等方式进行显示。在显示画面上，通过图标的颜色变化反应现场设备的运行状态，如阀门的开与关，电机的启动与停止，位置开关的状态等。PID回路控制用数据、棒图等综合方法反映生产过程中量的变化，操作人员通过参数设定可进行参数调整，通过数据查询可查找任一时刻的数据记录，通过打印可保存相关的生产数据，为今后的生产管理和工艺参数的分析带来便利。近几年来，可编程序控制器(PLC)以其可靠性高、适应性强、灵活性好、编程简单、容易掌握等特性，在各个领域发挥越来越重要的作用。在PLC控制系统中，PLC作为主要控制设备，必然与控制对象中各种输入信号(如按钮、限位开关、拔动开关、继电器的触点及其它检测信号等)和输出设备(如继电器线圈、接触器线圈、电磁阀等执行元件)相关联。在实际工作中，由于受PLC应用系统规模的限制，PLC输入/输出点数往往不够用。为此若采用扩展输入/输出单元或更换点数更多的PLC来解决有时又不合算，为了降低系统硬件的成本，常常采用各种技巧减少系统占用的输入/输出点数，相当于扩展了PLC的I/O点数。本文从硬件、软件两个方面介绍在不增加硬件情况下“扩展”PLCI/O点数的几种方法。

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