产品介绍
施耐德 BMXAMI0410
价 格：￥电议
型 号：BMXAMI0410
产品完善度：
生产地：其他访问量：200次
发布日期：2018/4/26 16:54:08
更新日期：2019/6/15 11:18:18
详细内容
PLC与继电器接触器控制系统的比较通过对鼠笼式异步电动机起制动的传统控制方法和PLC控制方法的比较，从某种意义上看，PLC控制是从继电器接触器控制发展而来的。两者既有相似性又有很多不同处。
1、 二种方案的不同点
(1)PLC内部大部分采用“软”逻辑
继电器接触器控制全部用硬器件、硬触点和“硬”线连接，为全硬件控制;PLC内部大部分采用“软”电器、“软”接点和“软”线连接，为软件控制；
(2) PLC控制系统结构紧凑
继电器接触器控制系统使用电器多，体积大且故障率大;PLC控制系统结构紧凑，使用电器少，体积小；
(3) PLC内部全为“软接点”动作快
电器接触器控制全为机械式触点，动作慢，弧光放电严重;PLC内部全为“软接点”动作快；
(4) PLC控制功能改变极其方便
继电器接触器控制功能改变，需拆线接线乃至更换元器件，比较麻烦;PLC控制功能改变，一般只需修改程序便可，极其方便；
(5) PLC控制系统制造周期短
PLC控制系统由于结构简单紧凑，基本为软件控制，因此设计、施工与调试比继电器接触器控制系统周期短。
此外，由于PLC技术是计算机控制的基础上发展而来，因此，它的软硬件设置上有着传统的继电器接触器控制无法比拟的优势，工作可靠性极高。
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