詳細介紹
DS3800HPCA1F1E
攀鋼線材廠本次"提質降耗、擴大品種規(guī)模"技術改造是在原來的只有精軋機組、夾送輥、吐絲機設備的基礎上,增加兩架預精軋機組和啟停式飛剪,將把預精軋機組、飛剪、精軋機組、夾送輥、吐絲機的模擬傳動改為數(shù)字傳動,應用ABB公司的DCS500直流數(shù)字裝置;同時將原來的繼電器邏輯控制應用SIEMENS公司的S7-400 PLC來代替。組成為線材軋機的基礎自動化系統(tǒng)還有操縱監(jiān)控站,應用SIEMENS公司的WINCC治理應用軟件來實現(xiàn);產(chǎn)業(yè)以太網(wǎng)即H1網(wǎng),連接監(jiān)控操縱站和PLC;產(chǎn)業(yè)現(xiàn)場總線Profibus-DP,建立DCS500和遠程操縱單元ET200M與PLC的通訊
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自動化控制系統(tǒng)中,控制系統(tǒng)可分為三層,即數(shù)字傳動部分、PLC控制部分和監(jiān)控操縱站部分。
數(shù)字傳動部分應用ABB公司的DCS500直流數(shù)字裝置,處理預精軋機1組、2組、飛剪、精軋機1/2架、夾送輥、吐絲機的運行。
PLC控制部分應用S7-400型DS3800HPCA1F1EPLC,CPU為CPU414-2DP,處理全線的生產(chǎn)控制,完成系統(tǒng)功能手網(wǎng)絡的信息交換。
監(jiān)控操縱站部分應用WINCC監(jiān)控軟件,有A、B兩線操縱站兼監(jiān)控站和電氣室監(jiān)控站,處理軋制規(guī)程作業(yè)表的天生、全線操縱、事故監(jiān)控報警、生產(chǎn)記錄和報表等任務。
二、采用PROFIBUS的原因
PROFIBUS現(xiàn)場總線技術是隨全數(shù)字信號系統(tǒng)的發(fā)展而產(chǎn)生的,由德國組織開發(fā)的產(chǎn)業(yè)現(xiàn)場總線協(xié)議標準——PROFIBUS現(xiàn)場總線標準(DIN19254)。
PROFIBUS是近年來上zui為流行的現(xiàn)場總線,也是目前數(shù)據(jù)傳輸率zui快的一種現(xiàn)場總線(傳輸率可達12M波特),因此在很多領域內有廣泛地應用。
通過本年度的北京機電一體化設備展覽會可看到PROFIBUS總線蓬勃發(fā)展的生命力。根據(jù)Venture Developmen
Corp.(VDC)的研究報告,PROFIBUS所占的*,也是發(fā)展zui快的現(xiàn)場總線。
PROFIBUS的網(wǎng)絡協(xié)議是以ISO頒布的OSI標準七層參考模型為基礎的,只是對第三層到第六層進行簡化,因此可以說它的標準適應性強。此外它的三種模塊(FMS.DP和PA)又可以適應不同的應用對象和通訊速率方面的要求,開放性也好。
PROFIBUS現(xiàn)場總線基于令牌協(xié)議加主從總線的介質存取方式,主站以主從方式與從站通訊,各主站之間由令牌協(xié)議決定總線控制權。站點數(shù)可達127個。
正是基于PROFIBUS現(xiàn)場總線技術上的成熟和開放性,以及實際應用后的經(jīng)濟效果,因此我們在自動化控制系統(tǒng)中采用了它。
三、Profibus-DP組態(tài)說明
在以上的自動化控制系統(tǒng)中,PROFIBUS-DP現(xiàn)場總線應用在直流數(shù)字傳動裝置DCS500、遠程操縱單元ET200M與S7-400PLC之間的通訊上。
1、硬件組態(tài)
Profibus-DP總線共有9個站,分別是S7-400PLC作為Master,站號設定:2;其余均為Slave,它們有遠程操縱接口單元ET200M,站號設定:3;預精軋機1組數(shù)字傳動裝置DCS500,站號設定:4;預精軋機2組數(shù)字傳動裝置DCS500,站號設定:5;精軋機1架數(shù)字傳動裝置DCS500,站號設定:6;精軋機2架數(shù)字傳動裝置DCS500,站號設定:7;飛剪數(shù)字傳動裝置DCS500,站號設定:8;夾送輥數(shù)字傳動裝置DCS500,站號設定:9;吐絲機數(shù)字傳動裝置DCS500,站號設定:10。主站上應用S7-400PLC的CPU414-2DP,BUS終端器設定為ON。從站中DCS500設備應用PROFIBUS適配模件NPBA-02,BUS終端器設定為OFF,ET200M的BUS終端器設定為ON。BUS終端器設定一定要正確,即BUS兩端為ON,中間接點為OFF。通訊間隔約為500M。
Profibus-DP的布線要嚴格按照適配模件的說明來接線,通訊電纜用西門子公司的DP電纜或屏蔽雙絞兩芯電纜。屏蔽層的接線一定要保證單端接地,同時結合現(xiàn)場總線的抑制干擾技術可以保證系統(tǒng)通訊的正常運行。
2、軟件組態(tài)
系統(tǒng)的組成假如不是一家公司的設備和材料,則為了確保參數(shù)匹配正確,各公司均提供有ProfiDrive的定義程序來匹配Profibus的組態(tài)。
在Master站S7-400PLC上,要對DP進行組態(tài),通過STEP7軟件包結合ProfiDrive的定義程序來進行。組態(tài)的關鍵是正確地選擇Profibus-DP的方式,即PPO的類型。在該系統(tǒng)中為PPO-2型,通訊字有十個數(shù)據(jù)字。由于線路的長度,約為500M,故通訊速率選擇為500KB/S,根據(jù)實際的應用效果看,該速率滿足系統(tǒng)的信號交換要求。
在Slave站DCS500上,同樣要正確地組態(tài)通訊參數(shù)。從站的接口適配模件為NPBA-02,在驅動和NPBA-02之間建立,即PLC與DCS500之間建立通訊,有八個組態(tài)參數(shù)必須組態(tài)。
經(jīng)過上述兩方面軟硬件的正確組態(tài)后,Profibus-DP總線就建立起來了。
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