型号:2214-30SLQTA
品牌:DANGER
用于运动控制
实际的物理量,除了开关量、模拟量,还有运动控制。如机床部件的位移,常以数字量表示。运动控制,有效的办法是NC,即数字控制技术。这是50年代诞生于美国的基于计算机的控制技术。当今已很普及,并也很完善。目前,先进国家的金属切削机床,数控化的比率已超过40%~80%,有的甚至更高。PLC也是基于计算机的技术,并日益完善。PLC可接收计数脉冲,频率可高达几k到几十k赫兹,可用多种方式接收这脉冲,还可多路接收。有的PLC还有脉冲输出功能,脉冲频率也可达几十k,有了这两种功能,加上PLC有数据处理及运算能力,若再配备相应的传感器(如旋转编码器)或脉冲伺服装置,则完全可以依NC的原理实现种种控制。高、中档的PLC,还开发有NC单元,或运动单元,可实现点位控制。运动单元还可实现曲线插补,可控制曲线运动。所以,若PLC配置了这种单元,则完全可以用NC的办法,进行数字量的控制。新开发的运动单元,甚至还发行了NC技术的编程语言,为更好地用PLC进行数字控制提供了方便。
For motion control
The actual physical quantity includes switch quantity,analog quantity and motion control.For example,the displacement of machine tool components is often expressed in digital quantities.The effective method of motion control is NC,that is,digital control technology.This is a computer-based control technology that was born in the United States in the 1950s.Nowadays,it is very popular and perfect.At present,the numerical control ratio of metal cutting machine tools in advanced countries has exceeded 40%~80%,and some even higher.PLC is also a computer based technology,which is increasingly improved.The PLC can receive the counting pulse,the frequency can be as high as several k to tens of kHz,which can be received in a variety of ways,as well as multiple channels.Some PLCs also have the pulse output function,and the pulse frequency can reach dozens of k.With these two functions,plus the PLC’s data processing and computing capabilities,if equipped with corresponding sensors(such as rotary encoders)or pulse servo devices,various controls can be completely realized according to the principle of NC.High and medium level PLC,also developed with NC unit or motion unit,can realize point control.The motion unit can also realize curve interpolation and control curve motion.Therefore,if the PLC is configured with such a unit,the NC method can be used to control the digital quantity.The newly developed motion unit even released the programming language of NC technology,which provides convenience for better digital control with PLC.
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