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我們新研制出一種用于紙漿白度測定的智能白度儀，該儀表采用西門子公司生產(chǎn)的S7-224 CPU結(jié)合軟件功能進(jìn)行數(shù)據(jù)處理，具有較好的可靠性、重復(fù)性、精確度和穩(wěn)定性。為了使其能與其它智能設(shè)備之間實現(xiàn)通信，我們將通過現(xiàn)場總線技術(shù)把它連接到網(wǎng)絡(luò)中，使它成為造紙廠現(xiàn)場總線控制系統(tǒng)的一部分。

2.現(xiàn)場總線的選擇

  2.1現(xiàn)場總線技術(shù)的選擇

  現(xiàn)場總線集控制技術(shù)、計算機(jī)技術(shù)、通信技術(shù)于一體，是當(dāng)今自動化領(lǐng)域技術(shù)發(fā)展的熱點之一。這項技術(shù)可將多個智能控制儀表連接成網(wǎng)絡(luò)系統(tǒng)，實現(xiàn)分布式計算機(jī)控制，提高檢測和控制精度，改善系統(tǒng)的動態(tài)響應(yīng)速度，提高系統(tǒng)安全性，從而得到了廣泛的應(yīng)用。

  近年來，幾種有影響的現(xiàn)場總線技術(shù)已在一些特定的應(yīng)用領(lǐng)域里顯示出各自的優(yōu)勢。在此，我們選定了現(xiàn)為德國和歐洲標(biāo)準(zhǔn)的PROFIBUS（Process Fieldbus）現(xiàn)場總線。一方面由于它是目前數(shù)據(jù)傳輸率快的一種現(xiàn)場總線，傳輸率高可達(dá)12Mbps，另一方面它能夠很好的與西門子的傳動設(shè)備相配合，并與西門子PLC（Programmable Logic Controller）結(jié)合緊密且組態(tài)簡便。

  2.2 PROFIBUS現(xiàn)場總線簡介

  參照ISO/OSI參考模型,PROFIBUS現(xiàn)場總線只包含物理層、數(shù)據(jù)鏈路層和應(yīng)用層。由PROFIBUS-DP，PROFIBUS-FMS， PROFIBUS-PA組成PROFIBUS系列。

  PROFIBUS-DP：經(jīng)過優(yōu)化的高速、廉價的通信連接，專為自動控制系統(tǒng)和設(shè)備級分散I/O之間通信設(shè)計，使用PROFIBUS-DP模塊可取代價格昂貴的24V或0～20mA并行信號線。用于分布式控制系統(tǒng)的高速數(shù)據(jù)傳輸。

  PROFIBUS-FMS ：解決車間級通用性通信任務(wù)，提供大量的通信服務(wù)，完成中等傳輸速度的循環(huán)和非循環(huán)通信任務(wù)，用于紡織工業(yè)、樓宇自動化、電氣傳動、傳感器和執(zhí)行器、可編程序控制器、低壓開關(guān)設(shè)備等一般自動化控制。

  PROFIBUS-PA專為過程自動化設(shè)計，標(biāo)準(zhǔn)的本質(zhì)安全的傳輸技術(shù)，實現(xiàn)了IEC1158-2中規(guī)定的通信規(guī)程，用于對安全性要求高的場合及由總線供電的站點。

  本設(shè)計中采用的是PROFIBUS-DP標(biāo)準(zhǔn)，PROFIBUS-DP（或DP標(biāo)準(zhǔn)）是由歐洲標(biāo)準(zhǔn)EN50170定義的一種遠(yuǎn)程I/O通信協(xié)議。DP表示分布式外圍設(shè)備，亦即遠(yuǎn)程I/O。PROFIBUS-DP還用到了應(yīng)用層接口（ALI），ALI將過程對象轉(zhuǎn)換為通信對象。

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