推送:SMA8315HP-0C4-009B-1A-1-00省市縣區域/直送2023全+境+派+送福建中立恒自動(dòng)化設備有限公司1．輸入/輸出單元輸入/輸出單元通常也稱(chēng)I/O單元或I/O模塊，是PLC與工業(yè)生產(chǎn)現場(chǎng)之間的連接部件。
PLC通過(guò)輸入接口可以檢測被控對象的各種數據，以這些數據作為PLC對被控制對象進(jìn)行控制的依據；同時(shí)PLC又通過(guò)輸出接口將處理結果送給被控制對象，以實(shí)現控制目的。
由于外部輸入設備和輸出設備所需的信號電平是多種多樣的，而PLC內部CPU的處理的信息只能是標準電平，所以I/O接口要實(shí)現這種轉換。
I/O接口一般都具有光電隔離和濾波功能，以提高PLC的抗干擾能力。
另外，I/O接口上通常還有狀態(tài)指示，工作狀況直觀(guān)，便于維護。
PLC提供了多種操作電平和驅動(dòng)能力的I/O接口，有各種各樣功能的I/O接口供用戶(hù)選用。
I/O接口的主要類(lèi)型有：數字量（開(kāi)關(guān)量）輸入、數字量（開(kāi)關(guān)量）輸出、模擬量輸入、模擬量輸出等。
常用的開(kāi)關(guān)量輸入接口按其使用的電源不同有三種類(lèi)型：直流輸入接口、交流輸入接口和交/直流輸入接口。
常用的開(kāi)關(guān)量輸出接口按輸出開(kāi)關(guān)器件不同有三種類(lèi)型：是繼電器輸出、晶體管輸出和雙向晶閘管輸出。
繼電器輸出接口可驅動(dòng)交流或直流負載，但其響應時(shí)間長(cháng)，動(dòng)作頻率低；而晶體管輸出和雙向晶閘管輸出接口的響應速度快，動(dòng)作頻率高，但前者只能用于驅動(dòng)直流負載，后者只能用于交流負載。
PLC的I/O接口所能接受的輸入信號個(gè)數和輸出信號個(gè)數稱(chēng)為PLC輸入/輸出（I/O）點(diǎn)數。
I/O點(diǎn)數是選擇PLC的重要依據之一。
當系統的I/O點(diǎn)數不夠時(shí)，可通過(guò)PLC的I/O擴展接口對系統進(jìn)行擴展。
2．通信接口PLC配有各種通信接口，這些通信接口一般都帶有通信處理器。
PLC通過(guò)這些通信接口可與監視器、打印機、其它PLC、計算機等設備實(shí)現通信。
PLC與打印機連接，可將過(guò)程信息、系統參數等輸出打??；與監視器連接，可將控制過(guò)程圖像顯示出來(lái)；與其它PLC連接，可組成多機系統或連成網(wǎng)絡(luò )，實(shí)現更大規?？刂?。
與計算機連接，可組成多級分布式控制系統，實(shí)現控制與管理相結合。
遠程I/O系統也必須配備相應的通信接口模塊。
3．智能接口模塊智能接口模塊是一獨立的計算機系統，它有自己的CPU、系統程序、存儲器以及與PLC系統總線(xiàn)相連的接口。
它作為PLC系統的一個(gè)模塊，通過(guò)總線(xiàn)與PLC相連，進(jìn)行數據交換，并在PLC的協(xié)調管理下獨立地進(jìn)行工作。
PLC的智能接口模塊種類(lèi)很多，如：高速計數模塊、閉環(huán)控制模塊、運動(dòng)控制模塊、中斷控制模塊等。
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