以前在串—并联冗余系统可靠性的最优分配问题上，总是把部件的可靠度看成是一个确定的值。

Previous research on the redundancy allocation problem for series parallel systems has focused on where component reliability is assumed to be an exact value.

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以前在串-并联冗余系统可靠性的最优分配问题上，总是把部件的可靠度看成是一个确定的值，此方法有其局限性。

Previous research on the redundancy allocation problem for series-parallel systems has focused on where component reliability is assumed to be an exact value.

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急停系统采用数据通信的方式实现并行冗余，提高了系统的可靠性。

The parallel and redundancy are implemented by using data communication method in emergency shutdown for enhancing the reliability of the system.

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