描述
超細(xì)煅燒陶土由于性能優(yōu)良,在化工、醫(yī)藥、日用、家化等產(chǎn)品中被廣泛采用,我國(guó)陶土資源豐富,但其煅燒工藝極其復(fù)雜,主要是其煅燒的溫度、時(shí)間等對(duì)煅燒陶土的性能影響極大,控制參數(shù)稍有變化,或許整爐陶土將報(bào)廢,針對(duì)如此嚴(yán)格的煅燒工藝,研制了一套采用CC-link總線組建的測(cè)控系統(tǒng)對(duì)煅燒爐的四個(gè)煅燒區(qū)進(jìn)行溫度、時(shí)間控制,取得了較好的控制效果,同時(shí)也產(chǎn)生了較好的經(jīng)濟(jì)效益。為了提高CC-link總線數(shù)據(jù)傳輸?shù)目旖菪?、避免?shù)據(jù)通信沖突,在CC-link實(shí)時(shí)通信中,采取了一系列的安全措施,以確保CC-link總線控制系統(tǒng)的穩(wěn)定、可靠性。
2 CC-link的特性與網(wǎng)絡(luò)安全
2.1 CC-link的特性
CC-link是Control&Communication link(控制與通信鏈路系統(tǒng))的簡(jiǎn)稱,是三菱電機(jī)于1996年推出的開放式現(xiàn)場(chǎng)總線,其數(shù)據(jù)容量大,通信速度多級(jí)可選擇,而且它是一個(gè)復(fù)合的、開放的、適應(yīng)性強(qiáng)的網(wǎng)絡(luò)系統(tǒng),能夠適應(yīng)于較高的管理層網(wǎng)絡(luò)到較低的傳感器層網(wǎng)絡(luò)的不同范圍。CC-link是一個(gè)以設(shè)備層為主的網(wǎng)絡(luò),一般情況下,CC-link整個(gè)一層網(wǎng)絡(luò)可由一個(gè)主站和六十四個(gè)從站組成。網(wǎng)絡(luò)中的主站由PLC擔(dān)當(dāng),從站可以是遠(yuǎn)程I/O模塊、特殊功能模塊、帶有CPU和PLC本地站、人機(jī)界面、變頻器及各種測(cè)量?jī)x表、閥門等現(xiàn)場(chǎng)儀表設(shè)備。且可實(shí)現(xiàn)從CC-link到AS-I總線的聯(lián)接。CC-link具有高速的數(shù)據(jù)傳輸速度,最達(dá)可達(dá)10Mbps。CC-link的底層通信協(xié)議遵循RS485,一般情況下,CC-link主要采用廣播一輪詢的方式進(jìn)行通信,CC-link也支持主站與本地站、智能設(shè)備站之間的瞬間通信。
產(chǎn)品廣泛應(yīng)用于:電力、石油、礦井提升、港口、供熱、燃?xì)?、供水、污水處理、冶金、造紙、紡織、化工、水利等現(xiàn)代化工業(yè)領(lǐng)域!
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