140CPS41400
140CPS41400
140CPS41400
本地I/O
可编程序控制器的本地I/O框架一般距CPU框架很近,它们往往装在同一个控制柜内。对于单台机械设备,如中小型机床,一般只有本地I/O。本地I/O用多芯电缆(一般是扁平电缆)实现扩展I/O框架与CPU框架之间的通信。扁平电缆可能多达数十根导线,信息是并行传送的,这种通信方式实际上是总线通信的扩展,其主要优点是数据传输速度快,在某些情况下可以同步地刷新CPU模块中的I/O映象表。“本地“(Local)这一名词不是很确切的,因为有时本地I/O与CPU模块的距离可能长达数百m。本地I/O模块的主要特征是框架之间采用并行通信方式,通常用编程器可以直接对本地I/O存取数据,对系统调试和查错特别方便。但是多芯电缆价格很贵,对于改造旧设备,电缆的安装(如穿管)可能不是很方便。
备货,备货,降降降,火火火,火火火……
备货,备货,降降降,火火火,火火火……
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