描述
PLC中的定時(shí)器相當(dāng)于繼電器系統(tǒng)中的時(shí)間繼電器。它有一個(gè)設(shè)定值寄存器(一個(gè)字長(zhǎng))、一個(gè)當(dāng)前值寄存器(一個(gè)字長(zhǎng))和一個(gè)用來儲(chǔ)存其輸出觸點(diǎn)狀態(tài)的映像寄存器(占二進(jìn)制的一位)，這三個(gè)存儲(chǔ)單元使用同一個(gè)元件號(hào)。FX系列PLC的定時(shí)器分為通用定時(shí)器和積算定時(shí)器。
常數(shù)K可以作為定時(shí)器的設(shè)定值，也可以用數(shù)據(jù)寄存器(D)的內(nèi)容來設(shè)置定時(shí)器。例如外部數(shù)字開關(guān)輸入的數(shù)據(jù)可以存入數(shù)據(jù)寄存器，作為定時(shí)器的設(shè)定值。通常使用有電池后備的數(shù)據(jù)寄存器，這樣在斷電時(shí)不會(huì)丟失數(shù)據(jù)。
1．通用定時(shí)器
各系列的定時(shí)器個(gè)數(shù)和元件編號(hào)如表3–5所示。100ms定時(shí)器的定時(shí)范圍為0.1～3276.7s，10ms定時(shí)器的定時(shí)范圍為0.01～327.67s。FX1S的特殊輔助繼電器M8028為1狀態(tài)時(shí)，T32～T62(31點(diǎn))被定義為10ms定時(shí)器。圖3–10中X0的常開觸點(diǎn)接通時(shí)，T200的當(dāng)前值計(jì)數(shù)器從0開始，對(duì)10ms時(shí)鐘脈沖進(jìn)行累加計(jì)數(shù)。當(dāng)前值等于設(shè)定值414時(shí)，定時(shí)器的常開觸點(diǎn)接通，常閉觸點(diǎn)斷開，即T200的輸出觸點(diǎn)在其線圈被驅(qū)動(dòng)10ms×414=4.14s后動(dòng)作。X0的常開觸點(diǎn)斷開后，定時(shí)器被復(fù)位，它的常開觸點(diǎn)斷開，常閉觸點(diǎn)接通，當(dāng)前值恢復(fù)為0。
歐美品牌停產(chǎn)的，常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域：
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列
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