描述
4.靈活性和擴(kuò)展性
(1)繼電器控制:系統(tǒng)安裝后,受電氣設(shè)備觸點(diǎn)數(shù)目的有限性和連線復(fù)雜等原因的影響,系統(tǒng)今后的靈活性、擴(kuò)展性很差。
(2)PLC控制:具有專用的輸入與輸出模塊;連線少,靈活性和擴(kuò)展性好。
5.計(jì)數(shù)功能
(1)繼電器控制:不具備計(jì)數(shù)的功能。
(2)PLC控制:PLC內(nèi)部有特定的計(jì)數(shù)器,可實(shí)現(xiàn)對生產(chǎn)設(shè)備的步進(jìn)控制。
6.可靠性和可維護(hù)性
(1)繼電器控制:使用大量機(jī)械觸點(diǎn),觸點(diǎn)在開閉時(shí)會(huì)產(chǎn)生電弧,造成損傷并伴有機(jī)械磨損,使用壽命短,運(yùn)行可靠性差,不易維護(hù)。
(2)PLC控制:采用微電子技術(shù),內(nèi)部的開關(guān)動(dòng)作均由無觸點(diǎn)的半導(dǎo)體電路來完成;體積小,
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主營:世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(??怂共_):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂):Indramat,I/O模塊,PLC控制器,驅(qū)動(dòng)模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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