AS-516P-008
AS-516P-008
AS-516P-008
1. PLC的循环读服务数（cyclic read services）。这是WinCC和S7-300/400通信时，比较的通讯优化方式，类似订阅的概念。基本过程可以简单的这样理解：每当打开/切换一幅画面时，系统会统计这画面中所使用的变量及这些变量的更新周期，将这些变量的请求按更新周期分类，形成“订单”并提交给PLC，PLC接受到“订单”后，按“订单”中所的更新周期，分批次的主动将数据定时的发给WinCC，而不需要WinCC再去定时的向PLC发请求。这样就可以有效提高数据交换效率。这里的一个“批次”就可以理解为一个“PLC的循环读服务”，而不同的PLC所支持的循环读服务数也可能有所不同，比如CPU416 多支持32个，而CPU 412只有16个。多台WinCC同时访问一个PLC时，不但会占用PLC的连接资源，同时也会占用PLC的循环读服务数。
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