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         圖7    定時(shí)器的應(yīng)用
圖7(a)為定時(shí)器應(yīng)用于常開(kāi)斷電延時(shí)的梯形圖，當(dāng)輸入端有X00信號(hào)輸人時(shí)，Y00通電并經(jīng)其常開(kāi)觸點(diǎn)自保，因此為常開(kāi)瞬時(shí)觸點(diǎn)接通。
當(dāng)輸入信號(hào)X00消失時(shí)，定時(shí)器線圈TOO通電，到達(dá)設(shè)定時(shí)間后，TOO常閉觸點(diǎn)斷開(kāi)，Y00線圈斷電。因此構(gòu)成了常開(kāi)斷電延時(shí)觸點(diǎn)。
在對(duì)某觸點(diǎn)即需要通電延時(shí)，又需要斷電延時(shí)，則可采用圖7(b)由兩個(gè)定時(shí)器組成的電路。此電路相當(dāng)于常開(kāi)通電延時(shí)閉合、斷電延時(shí)斷開(kāi)觸點(diǎn)。由此可見(jiàn)，利用PLC內(nèi)部繼電器組成的延時(shí)電路在選型、工藝、改裝等各方面都要比普通時(shí)間繼電器靈活方便得多。
(6)斷電保存寄存器(B／M)。PLC上電工作時(shí)，除去已閉合的輸入條件，其他寄存器的值都為0。
斷電保存寄存器除具有輔助寄存器功能外，還具有斷電保存的功能，即PLC上電時(shí)保持上次斷電時(shí)的狀態(tài)。
(7)用戶指令寄存器(P)。一般在內(nèi)裝式PLC中提供，各寄存器的含義由PLC定義。
(8)CNC狀態(tài)寄存器(F)。一般在內(nèi)裝式PLC中提供，各寄存器的含義由數(shù)控系統(tǒng)軟件定義。
(9)CNC控制寄存器(G)。一般在內(nèi)裝式PLC中提供，各寄存器的含義由數(shù)控系統(tǒng)軟件定義。

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