1756-CN2R
廈門卡庫電氣有限公司
業(yè)務負責人: 廖工
咨詢--熱線:18030229052
咨詢--座機: 0592-5709823
咨詢--Q Q: 1093230189
1756-CN2R
PLC控制系統(tǒng)的設計 PLC 控制系統(tǒng)設計包括硬件設計和軟件設計。 3.1 PLC控制系統(tǒng)的硬件設計 硬件設計是PLC控制系統(tǒng)的至關重要的一個環(huán)節(jié),這關系著PLC控制系統(tǒng)運行的可靠性、安全性、穩(wěn)定性。主要包括輸入和輸出電路兩部分。 (1) PLC控制系統(tǒng)的輸入電路設計。PLC供電電源一般為AC85—240V,適應電源范圍較寬,但為了抗干擾,應加裝電源凈化元件(如電源濾波器、1:1隔離變壓器等);隔離變壓器也可以采用雙隔離技術,即變壓器的初、次級線圈屏蔽層與初級電氣中性點接大地,次級線圈屏蔽層接PLC 輸入電路的地,以減小高低頻脈沖干擾。 PLC輸入電路電源一般應采用DC 24V, 同時其帶負載時要注意容量,并作好防短路措施,這對系統(tǒng)供電安全和PLC安全至關重要,因為該電源的過載或短路都將影響PLC的運行,一般選用電源的容量為輸入電路功率的兩倍,PLC輸入電路電源支路加裝適宜的熔絲,防止短路。 (2) PLC控制系統(tǒng)的輸出電路設計。依據(jù)生產工藝要求,各種指示燈、變頻器/數(shù)字直流調速器的啟動停止應采用晶體管輸出,它適應于高頻動作,并且響應時間短;如果PLC 系統(tǒng)輸出頻率為每分鐘6 次以下,應繼電器輸出,采用這種方法,輸出電路的設計簡單,抗干擾和帶負載能力強。 如果PLC輸出帶電磁線圈等感性負載,負載斷電時會對PLC的輸出造成浪涌電流的沖擊,為此,對直流感性負載應在其旁邊并接續(xù)流二極管,對交流感性負載應并接浪涌吸收電路,可有效保護PLC。 當PLC掃描頻率為10次/min 以下時,既可以采用繼電器輸出方式,也可以采用PLC輸出驅動中間繼電器或者固態(tài)繼電器(SSR),再驅動負載。 對于兩個重要輸出量,不僅在PLC內部互鎖,建議在PLC外部也進行硬件上的互鎖,以加強PLC系統(tǒng)運行的安全性、可靠性。 對于常見的AC220V交流開關類負載,例如交流接觸器、電磁閥等,應該通過DC24V微小型中間繼電器驅動,避免PLC的DO接點直接驅動,盡管PLC手冊標稱具有AC220V交流開關類負載驅動能力。
NEW GENERAL ELECTRIC 7VPCJ052CD06 VARIABLE SPEED 20HP 500V 36A AC
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【商家簡介】廈門卡庫電氣有限公司是自動化產品及自動化設備銷售的企業(yè),對各大自動化產品品牌有著強大的優(yōu)勢,并且對優(yōu)勢產品有著大量的備貨。與歐洲及世界從事電氣的各大品牌公司有著良好的協(xié)作關系。歡迎來電咨詢! DCS 數(shù)控系統(tǒng) 傳感器 高壓柜 變電站 變壓器 敏感元器件 PLC 伺服定位系統(tǒng)一站式服務 主營產品:Fanuc,Foxboro,Ovatin,Allen-Bradley,Siemens等各類工控產品,歡迎來電咨詢!...
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