Description
安全PLC内部CPU数量至少两个或者多个,两个CPU的功能是:分别对同一个程序各执行一次,然后把记过放在一起比较,如果结果一直,就会进行输出,如果不一致,则选择安全的结果输出(通常意义上的不输出或者停机)
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