描述
除行程开关ST1和ST2外，还有开关ST3与ST4安装在行程极限位置。当由于某种原因工作台到达STl与ST2位置时，未能切断电动机，工作台将继续移动到极限位置，压下ST3或ST4，此时可使电动机停止，避免由于超出允许位置所导致的事故，因此ST3与ST4起超程限位保护作用。
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③General electric(通用电气)系列产品》
④Westinghouse（美国西屋）系列产品》
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据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余（TMR）
结构的zui现代化的容错控制器。
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