厦门钛霓电气有先公司
主营产品: 电工电气,工控设备,PLC |
厦门钛霓电气有先公司
主营产品: 电工电气,工控设备,PLC |
参考价 | 面议 |
更新时间:2018-05-11 11:57:17浏览次数:498
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SHARP ZV-8S4
SHARP ZV-8S4
SHARP
这样,用PLC实现模拟量控制是*可能的。控制的单位值可小到212分之一的测量程值,多数也是足够的。
PLC进行模拟量控制,还有A/D、D/A组合在一起的单元,并可用PID或模糊控制算法实现控制,可得到很高的控制质量。
用PLC进行模拟量控制的好处是,在进行模拟量控制的同时,开关量也可控制。这个优点是别的控制器所不具备的,或控制的实现不如PLC方便。
当然,若纯为模拟量的系统,用PLC可能在性能价格比上不如用调节器。这也是应当看到的。
3用于数字量控制
实际的物理量,除了开关量、模拟量,还有数字量。如机床部件的位移,常以数字量表示。
数字量的控制,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,*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。
现货,现货,降降降,火火火,火火火……
现货,现货,降降降,火火火,火火火……
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