GE 531X111PSHAWG3

切换控制到备份单元

在下列情况下切换控制到备份的单元

1.激活单元检测到自身的一个致命故障。

2.激活单元处于停止模式下。

3.激活单 元启动失败或者掉电。

4. *RMX 模板的切换功能开关被置位。

5. *程序要求执行切换。

*如果执行最后两项切换的时间小于10秒，第二次切换将不被执行。

切换的时间

激活单元和备份单元之间的切换时间取决于执行切换时的原因。

有两种方式备份单元检测激活单元发生错误或者处于掉电状态

A.所有存在的冗余连接都失败。

B.等待激活单元到达同步点的时间超过“失败等待时间”的设定值。

在这两种情况下切换立即进行。

在其它原因切换的情况下，切换在在下次输入数据之前发生。最大的等待时间是一个周期。可能在检测到致命错误并切换时继续进行一次输入和输出的扫描。

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