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產(chǎn)品簡介
CUTLER HAMMER D520RA2
CUTLER HAMMER D520RA2
產(chǎn)品價格:¥5464
上架日期:2022-07-19 09:17:18
產(chǎn)地:本地
發(fā)貨地:福建廈門市
供應(yīng)數(shù)量:不限
最少起訂:1個
瀏覽量:100
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詳細(xì)說明
    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(shí)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(jì)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(diǎn)之一。這項(xiàng)技術(shù)可將多個智能控制儀表連接成網(wǎng)絡(luò)系統(tǒng),實(shí)現(xiàn)分布式計(jì)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(jì),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(jì),標(biāo)準(zhǔn)的本質(zhì)安全的傳輸技術(shù),實(shí)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(diǎn)。

      本設(shè)計(jì)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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