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公司基本資料信息
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可編程控制器廣泛運(yùn)用于工業(yè)現(xiàn)場(chǎng)工作中。了解plc可編程控制器原理有助于人們更好更順利地工作。本文就可編程控制器實(shí)現(xiàn)控制的要點(diǎn)來(lái)分析研究plc可編程控制器原理。
它源于繼電控制裝置,但它不像繼電裝置那樣,通過(guò)電路的物理過(guò)程實(shí)現(xiàn)控制,而主要靠運(yùn)行存儲(chǔ)于PLC內(nèi)存中的程序,進(jìn)行入出信息變換實(shí)現(xiàn)控制。
PLC基于電子計(jì)算機(jī),但并不等同于普通計(jì)算機(jī)。普遍計(jì)算機(jī)進(jìn)行入出信息變換,多只考慮信息本身,信息的入出,只要人機(jī)界面好就可以了。而PLC則還要考慮信息入出的可靠性、實(shí)時(shí)性,以及信息的使用等問(wèn)題。特別要考慮怎么適應(yīng)于工業(yè)環(huán)境,如便于安裝,抗干擾等問(wèn)題。
可編程控制器實(shí)現(xiàn)控制的要點(diǎn)
入出信息變換、可靠物理實(shí)現(xiàn),可以說(shuō)是PLC實(shí)現(xiàn)控制的兩個(gè)基本要點(diǎn)。
入出信息變換靠運(yùn)行存儲(chǔ)于PLC內(nèi)存中的程序?qū)崿F(xiàn)。PLC程序既有生產(chǎn)廠家的系統(tǒng)程序(不可更改),又有用戶自行開發(fā)的應(yīng)用(用戶)程序。系統(tǒng)程序提供運(yùn)行平臺(tái),同時(shí),還為PLC程序可靠運(yùn)行及信號(hào)與信息轉(zhuǎn)換進(jìn)行必要的公共處理。用戶程序由用戶按控制要求設(shè)計(jì)。什么樣的控制要求,就應(yīng)有什么樣的用戶程序。Basler Electric Transformer BE15062002 120V LO 240/480V HI New
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