8055-SCP-453

8055-SCP-453

8055-SCP-453

8055-SCP-453

可编程控制器控制网络的“周期 I/O 方式”通信

可编程控制器的远程 I/O 链路就是一种可编程控制器控制网络，在远程 I/O 链路中采用“周期 I/O 方式”交换数据。远程 I/O 链路按主从方式工作，可编程控制器带的远程 I/O 主单元在远程 I/O 链路中担任主站，其它远程 I/O 单元皆为从站。在主站中设立一个“远程 I/O 缓冲区”，采用信箱结构，划分为 n 个分信箱与每个从站一一对应，每个分信箱再分为两格，一格管发送，一格管接收。主站中负责通信的处理器采用周期扫描方式，按顺序与各从站交换数据，把与其对应的分箱中发送分格的数据送从站，从从站中读取数据放入与其对应的分信箱的接收分格中。这样周而复始，使主站中的“远程 I/O 缓冲区”得到周期性的刷新。

备货，备货，降降降，火火火，火火火……
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