描述

除了上述幾種輸出電路外，還有雙向晶閘管輸出電路，它用光電晶閘管實現(xiàn)隔離。雙向晶閘管由關(guān)斷變?yōu)閷?dǎo)通的延遲時間小于1ms，由導(dǎo)通變?yōu)殛P(guān)斷的延遲時間小于10ms。晶閘管在負(fù)載電流過小時不能導(dǎo)通，遇到這種情況時可以在負(fù)載兩端并聯(lián)電阻。

除了輸入模塊和輸出模塊，還有一種既有輸入電路又有輸出電路的模塊，輸入、輸出的點數(shù)一般相同，這種模塊使用戶確定PLC的硬件配置更為方便。

輸出電流的額定值與負(fù)載的性質(zhì)有關(guān)，例如FX的繼電器輸出模塊可以驅(qū)動2A/220VAC的電阻性負(fù)載，但是只能驅(qū)動80VA／220VAC的電感性負(fù)載和100W的白熾燈。額定輸出電流還與溫度有關(guān)，溫度升高時額定輸出電流減小，有的PLC提供了有關(guān)的曲線。

由于散熱的原因，有的輸出模塊需要考慮屬于同一公共點(COM)的幾個輸出點的總電流，例如FX的晶體管輸出模塊的額定輸出電流是0.5A/點，0.8A/COM。

繼電器輸出模塊的使用電壓范圍廣，導(dǎo)通壓降小，承受瞬時過電壓和過電流的能力較強，但是動作速度較慢，壽命(動作次數(shù))有一定的限制。如果負(fù)載的通斷變化不是很頻繁，建議優(yōu)先選用繼電器型的。

晶體管型與雙向晶閘管型模塊分別用于直流負(fù)載和交流負(fù)載，它們的可靠性高，反應(yīng)速度快，壽命長，但是過載能力稍差。

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算機控制系統(tǒng)》

7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列

本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

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