該元件允許預(yù)先選擇-個(gè)新的位置。預(yù)選的位置在到時(shí)間后應(yīng)用或是對(duì)過(guò)用戶定度的獨(dú)立輸入確認(rèn)后應(yīng)用。選擇器的位置存儲(chǔ)在一個(gè)穩(wěn)定存儲(chǔ)器中。-上電，原來(lái)的位置被存儲(chǔ)或是繼電器與用戶設(shè)定的三比特的現(xiàn)有字同步。在不正常情況下使用基本報(bào)警功能，如三比特控制輸入超出范圍。

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