PMC720
PMC720
PMC720
“全局 I/O 方式”是一种串行共享存储区通信方式，它主要用于带有链接区的可编程控制器之间的通信。
全局 I/O 方式的通信原理如图所示。在可编程控制器网络的每台可编程控制器的 I/O 区中划出一个块来作为链接区，每个链接区都采用图中所表示的邮箱结构。相同编号的发送区与接收区大小相同，占用相同的地址段，一个为发送区，其它皆为接收区。采用广播方式通信。可编程控制器把 1 ＃发送区的数据在可编程控制器网络上广播，可编程控制器 2 、可编程控制器 3 收听到后把它接收下来存入各自的 1 ＃接收区中。可编程控制器 2 把 2 ＃发送区数据在可编程控制器网上广播，可编程控制器 1 、可编程控制器 3 把它接收下来存入各自的 2 ＃接收区中。可编程控制器 3 把 3 ＃发送区数据在可编程控制器网上广播，可编程控制器 1 、可编程控制器 2 把它接收下来存入各自的 3 ＃接收区中。显然通过上述广播通信过程，可编程控制器 1 、可编程控制器 2 、可编程控制器 3 的各链接区中数据是相同的，这个过程称为等值化过程。通过等值化的通信使得可编程控制器网络中的每台可编程控制器的链接区中的数据保持一致。它既包含着自己送出去的数据，也包含着其它可编程控制器送来的数据。由于每台可编程控制器的链接区大小一样，占用的地址段相同，每台可编程控制器只要访问自己的链接区，就等于访问其它可编程控制器的链接区，也就相当于与其它可编程控制器交换了数据。这样链接区就变成了名符其实的共享存储区，共享区成为各可编程
厦门泰尼电气有限公司
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