1746-R15產(chǎn)品介紹：
1746-R15廈門卡庫電氣有限公司
聯(lián)系人：嚴(yán)小姐
手機：
電話：0592-5709823
傳真：0592-5709828
Q 在PLC控制系統(tǒng)設(shè)計中,常常碰到負(fù)載的起動與停止控制,通常的做法是采用兩只按鈕作為外部起動與停止控制的輸入器件,在PLC中與兩只按鈕相對應(yīng)的輸入點數(shù)也有兩個，PLC的外部接線如圖1所示，按鈕SB1（X0）作為起動控制，按鈕SB2（X1）作為停止控制，這樣雖然可以達(dá)到控制目的,但需要的按鈕和連接導(dǎo)線較多,PLC的輸入點數(shù)也較多。但在實際工作中，可以充分利用PLC內(nèi)部多功能化的特點，采用單個按鈕控制負(fù)載的起動與停止，進(jìn)行改進(jìn)后的PLC外部接線如圖2所示，用SB替代SB1和SB2的功能，用X0替代X0和X1的功能，電路的實際接線就大大簡化，這樣做不僅節(jié)省了硬件成本,而且還大大減少了由于按鈕多而可能引起的故障.使電路更加經(jīng)濟(jì)合理、安全可靠，控制方便簡單，具有很高的實用價值。筆者根據(jù)實際的工作經(jīng)驗和研究成果，以松下電工FP0系列PLC為例介紹幾種單按鈕起停控制的PLC編程技術(shù)。[align=center] 圖1 圖2[/align] 1 采用上升沿微分指令的編程技術(shù) [align=center]圖3 采用上升沿微分指令編程的梯形圖程序 圖4采用置位/復(fù)位指令編程的梯形圖程序[/align]采用上升沿微分指令編程的梯形圖程序，如圖3所示，控制過程如下：當(dāng)?shù)谝淮伟聪耂B時，X0接通，使R0的線圈接通一個掃描周期，其常開觸點閉合，Y0的線圈接通并自鎖，啟動外部負(fù)載工作運行；同時，Y0的對常開觸點閉合，為R1的線圈接通做準(zhǔn)備；當(dāng)?shù)?次按下按鈕SB時，X0接通，R0再次接通一個掃描周期，R1的線圈被接通，R1的常閉觸點分?jǐn)啵琘0的線圈斷開，外部負(fù)載停止工作。反復(fù)按下SB，將會重復(fù)上述控制過程。采用置位/復(fù)位指令的編程技術(shù) 采用置位/復(fù)位指令編程的梯形圖程序，如圖4所示，控制過程如下：當(dāng)按下SB時，X0接通，R0的線圈接通一個掃描周期，其常開觸點閉合，R2置位（閉合）且保持，R2的一對常開觸點閉合，Y0的線圈接通，啟動外部負(fù)載工作運行；同時，R2的另一對常開接點閉合，為R1的線圈接通做準(zhǔn)備；當(dāng)再次按下SB時，X0接通，使R0的線圈再次接通一個掃描周期，R1的線圈接通，R1的常開接點閉合，R2復(fù)位（斷開）且保持,Y0的線圈斷開，外部負(fù)載停止工作運行。之后依次按下SB的工作情形與上述相同。
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A-B,GE FANUC,施耐德，西門子，西屋
電氣設(shè)備批發(fā)；計算機、軟件及輔助設(shè)備批發(fā)；通訊及廣播電視設(shè)備批發(fā)；其他機械設(shè)備及電子產(chǎn)品批發(fā)；經(jīng)營各類商品和技術(shù)的進(jìn)出口（不另附進(jìn)出口商品目錄），但國家限定公司經(jīng)營或禁止進(jìn)出口的商品及技術(shù)除外；其他未列明批發(fā)業(yè)（不含需經(jīng)許可審批的經(jīng)營項目）；其他未列明零售業(yè)（不含需經(jīng)許可審批的項目）；通信設(shè)備零售；...
廈門卡庫電氣有限公司是一家長年專業(yè)從事全球知名品牌abb dsqc機器人系統(tǒng)模塊備件及西門子摩爾（siemens moore apacs）控制系統(tǒng)零部件銷售企業(yè)、我們售出的備品備件均提供一年的質(zhì)量保證、并且都經(jīng)過了嚴(yán)格的測試和認(rèn)證。 公司自成立以來始終堅持以純電子商務(wù)模式運營、縮減中間環(huán)...