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huangaijia
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樓主  發(fā)表于: 2021-03-02 20:11
有哪位大神做過(guò)三菱PLC冗余的啊 應該怎么做?求指點(diǎn)。!
楓落云端
施主,腳抬一下
級別: 略有小成

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1樓  發(fā)表于: 2021-03-04 15:00
簡(jiǎn)單便宜的方案,只能算是冷備。
主PLC 程序一直驅動(dòng)Y0輸出控制繼電器得電。繼電器常閉觸點(diǎn)控制備用PLC.此時(shí),只要主PLC在RUN狀態(tài),Y0始終輸出,導致備用PLC斷電;如果主PLC不在RUN狀態(tài)或者斷電,繼電器不吸合,備用PLC得電。
同理,在Y0上再并接三個(gè)繼電器。三個(gè)串口引出線(xiàn)分別接到三個(gè)繼電器觸點(diǎn)再輸出,主PLC三個(gè)串口線(xiàn)接常開(kāi)觸點(diǎn),備用PLC的接對應常閉,輸出側為繼電器另一端。

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