Profibus 是唯一的全集成H1(過程)和H2(工廠自動化)的現(xiàn)場總線解決方案，是一種不依賴于制造商的開放式現(xiàn)場總線標(biāo)準(zhǔn)。采用Profibus標(biāo)準(zhǔn)系統(tǒng)，不同的制造商所生產(chǎn)的設(shè)備部須對其接口進(jìn)行特別調(diào)整就可通信，Profibus可用于高速并對時間苛求的數(shù)據(jù)傳輸，也可用于大范圍的復(fù)雜通信場合。

廈門岳航計算機(jī)工程有限公司

聯(lián)系人：李素云

企業(yè)QQ：2851195446，2851195466

手機(jī)：18965423501

座機(jī)：0592-5165501

Profibus根據(jù)應(yīng)用特點分為Profibus-DP ， Profibus-FMS ， Profibus-PA三個兼容版本。其中，Profibus-DP(H2)是一種經(jīng)過優(yōu)化的高速通信連接，專為自動控制系統(tǒng)和設(shè)備級分散I/O之間的通信設(shè)計的，可用于分布式控制系統(tǒng)的高速數(shù)據(jù)傳輸，其傳輸速率可達(dá)12Mbit/s，一般構(gòu)成單主站系統(tǒng)。

Profibus的特點為可使分散式數(shù)字化控制器從現(xiàn)場層到車間級網(wǎng)絡(luò)化，該系統(tǒng)分為主站和從站。主站決定總線的數(shù)據(jù)通信，當(dāng)主站得到總線控制權(quán)(令牌)時，沒有外界請求也可以主動發(fā)送信息。從站為外圍設(shè)備，典型的從站包括輸入輸出設(shè)備，控制器，驅(qū)動器和測量變送器。他們沒有總線控制權(quán)，僅對接收到的信息給予確認(rèn)或當(dāng)主站發(fā)出請求時向從站發(fā)送信息。

現(xiàn)場總線是以單個分散的、數(shù)字化、智能化的測量和控制設(shè)備作為網(wǎng)絡(luò)節(jié)點，用總線相連接，實現(xiàn)相互交換信息，共同完成自動控制功能的網(wǎng)絡(luò)系統(tǒng)與控制系統(tǒng)。它適合于替代價格昂貴的 24V DC和 4～20mA測量信號平行傳輸線路。在節(jié)省線路與設(shè)備的同時，也為武鋼煉鐵廠的以太網(wǎng)系統(tǒng)提供了現(xiàn)場級的控制功能。其原理如下圖2所示：

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