UF7810-2
UF7810-2
UF7810-2
当然这里的共享存储区与并行总线的共享存储区在结构上有些差别，它把物理上分布在各站的链接区，通过等值化通信使其好像重叠在一起，在逻辑上变成一个存储区，大小与一个链接区一样。这种共享存储区称为串行共享存储区。
链接区可以采用异步方式刷新（等值化），也可以采用同步方式刷新。异步方式刷新与可编程控制器中用户程序无关，由各可编程控制器所带的通信处理器按顺序进行广播通信，周而复始，使其所有链接区保持等值化。同步方式刷新是由用户程序中对链接区的发送指令启动一次刷新。这种方式只有当链接区的发送区数据变化时才刷新（等值化），这样事半功倍。
全局 I/O 方式中的链接区是从可编程控制器的 I/O 区划分出来的，经过等值化通信变成所有可编程控制器共享（全局共享），因此称为“全局 I/O 方式”。这种方式下可编程控制器直接用读写指令对链接区进行读写操作，简单、方便、快速，但应注意在一台可编程控制器中对某地址的写操作在其它可编程控制器中对同一地址只能进行读操作。与周期 I/O 方式一样，全局 I/O 方式也要占用可编程控制器的 I/O 区，因而只适用于少量数据的通信。
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