描述

VMIVME-7486

数控机床作为自动化控制设备，是在自动控制下进行工作的，数控机床所受控制可分为两类：

一类是最终实现对各坐标轴运动进行的“数字控制”。如：对CNC车床X轴和Z轴，CNC铣床X轴，Y轴和Z轴的移动距离，各轴运行的插补、补偿等的控制即为“数字控制”。

另一类是“顺序控制”。对数控机床来说，“顺序控制”是在数控机床运行过程中，以CNC内部和机床各行程开关、传感器、按钮、继电器等的开关量信号状态为条件，并按照预先规定的逻辑顺序对诸如主轴的起停、换向，刀具的更换，工件的夹紧、松开，液压、冷却、润滑系统的运行等进行的控制。与“数字控制”比较，“顺序控制”的信息主要是开关量信号。

可编程控制器(PLC)具有如下特点

(1)PLC是一种专用于工业顺序控制的微机系统。

(2)PLC是专为在恶劣的工业环境下使用而设计的，所以具有很强的抗干扰能力。

(3)结构紧凑、体积小，很容易装入机床内部或电气箱内，便于实现动作复杂的控制逻辑和数控机床的机电一体化。

(4)采用梯形图编程方式。

(5)PLC可与编程器、个人计算机等连接，可以很方便地实现程序的显示、编辑、诊断、存储和传送等操作。

PLC的产品很多，型号规格也不统一，可以从结构、原理、规模等方面分类。从数控机床应用的角度分，可编程控制器可分为两类：一类是CNC的生产厂家将数控装置(CNC)和PLC综合起来而设计的“内装型”(Build—inType)PLC；另一类是专业的PLC生产厂家的产品，它们的输入／输出信号接口技术规范、输入／输出点数、程序存储容量以及运算和控制功能均能满足数控机床的控制要求，称为“独立型”(Sand—aloneType)PLC。

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VMIVME-7486

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