功能请求模块#43的作用是使备份单元不接收从激活单元过来的传输数据。它的作用是确定备份单元采集的输入数据是否正确(意味着该单元是输入数据扫描的值有效)。还可以确定备用单元计算的逻辑输出和内部变量是否正确(意味着使逻辑处理单元处理有效)。这项功能只能在备份单元中实现。如果不在同步状态下此值失效,在激活单元里也是没有作用的。
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