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的S7-224 CPU結合軟件功能進行數(shù)據(jù)處理，具有較好的可靠性、重復性、精確度和穩(wěn)定性。為了使其能與其它智能設備之間實現(xiàn)通信，我們將通過現(xiàn)場總線技術把它連接到網絡中，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)場總線技術的選擇
現(xiàn)場總線集控制技術、計算機技術、通信技術于一體，是當今自動化領域技術發(fā)展的熱點之一。這項技術可將多個智能控制儀表連接成網絡系統(tǒng)，實現(xiàn)分布式計算機控制，提高檢測和控制精度，改善系統(tǒng)的動態(tài)響應速度，提高系統(tǒng)安全性，從而得到了廣泛的應用。
近年來，幾種有影響的現(xiàn)場總線技術已在一些特定的應用領域里顯示出各自的優(yōu)勢。在此，我們選定了現(xiàn)為德國和歐洲標準的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12Mbps，另一方面它能夠很好的與西門子的傳動設備相配合，并與西門子PLC（Programmable Logic Controller）結合緊密且組態(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)鏈路層和應用層。由PROFIBUS-DP，PROFIBUS-FMS， PROFIBUS-PA組成PROFIBUS系列。
PROFIBUS-DP：經過優(yōu)化的高速、廉價的通信連接，專為自動控制系統(tǒng)和設備級分散I/O之間通信設計，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，提供大量的通信服務，完成中等傳輸速度的循環(huán)和非循環(huán)通信任務，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、低壓開關設備等一般自動化控制。
PROFIBUS-PA專為過程自動化設計，標準的本質安全的傳輸技術，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。
本設計中采用的是PROFIBUS-DP標準，PROFIBUS-DP（或DP標準）是由歐洲標準EN50170定義的一種遠程I/O通信協(xié)議。DP表示分布式外圍設備，亦即遠程I/O。PROFIBUS-DP還用到了應用層接口（ALI），ALI將過程對象轉換為通信對象。
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RX-19-36 ROBERTSHAW / INVENSYS FRYER THERMOSTAT FOR MILLIVOLTS RX1936 RX 19 36
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Pneumodular Diverting Relay Robertshaw Or Invensys 2353-501 In The Box
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Pitco P5047588,Vulcan 410837-1, Invensys GSA60301800, Gas Thermostat 66-1017
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ORIGINAL AC POWER ADAPTER FOR INVENSYS WONDERWARE KONTRON TUOCH PLANEL
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TAC INVENSYS PNEUMATIC ACTUATOR VALVE LINKAGE KIT MK-2690 AV-400-0-0-1
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STATE-A.O. SMITH 9000547005 GAS CONTROL VALVE*INVENSYS/ROBERTSHAW
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Overstock Invensys Controls Heavy Duty Refrigerant Hose 48" 1290132-B48
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listing Foxboro P0916FK Rev B 18.5ft Length Cable I/A Series PLC Invensys PO916FK 18.5'
listing Foxboro P0916FJ Rev C 10ft Length Cable I/A Series PLC Invensys PO916FJ 10'
listing Foxboro P0916DX Rev B 18.5ft Length Cable I/A Series PLC Invensys PO916DX 18.5'
listing Foxboro P0916DE Rev C 32ft Length Cable I/A Series PLC Invensys PO916DE 32'
listing Foxboro P0916DD Rev C 18.5ft Length Cable I/A Series PLC Invensys PO916DD 18.5'
listing Foxboro P0916DD Rev B 10ft Length Cable I/A Series PLC Invensys PO916DD 10'
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