IC697BEM711N
系統(tǒng)簡述
本系統(tǒng)采用ge fanuc 90-30系列plc model351，一塊智能通訊模塊cmm311，一塊可編程智能通訊模塊pcm311，及開關(guān)量輸入、輸出模塊，模擬量輸入模塊若干。
通訊模塊cmm311有兩個(gè)通訊口，分別負(fù)責(zé)與上位機(jī)組態(tài)軟件及現(xiàn)場digital觸摸屏進(jìn)行通訊。
可編程通訊模塊pcm311為通訊協(xié)處理機(jī)，內(nèi)有固化的megabasic語言解釋程序，能執(zhí)行通過外部編程終端存儲進(jìn)來的basic程序。該模塊有兩個(gè)通訊端口，一個(gè)端口為編程口，ge公司logicmaster編程軟件包中有專用于pcm模塊編程的軟件，用它可通過該編程口登錄pcm模塊，將計(jì)算機(jī)中文本形式的basic代碼文件存入模塊的存儲器中;另一個(gè)端口為專用外部通訊口，在basic程序中可打開此端口與外部智能設(shè)備進(jìn)行通訊。在特殊時(shí)候，編程口也可被basic程序打開，作與外部設(shè)備通訊用，但這樣使用在調(diào)試時(shí)稍有不便。
系統(tǒng)布置要求敘述如下：
plc cpu負(fù)責(zé)開關(guān)量、模擬量的采集、運(yùn)算，實(shí)施直接的控制功能;通訊模塊cmm311通過兩個(gè)通訊口分別連接上位機(jī)及觸摸屏，實(shí)現(xiàn)人機(jī)界面與plc的數(shù)據(jù)通訊;pcm模塊的com2與westinghouse（西屋儀表）mint ii網(wǎng)絡(luò)轉(zhuǎn)換器相連，負(fù)責(zé)通過mint ii網(wǎng)絡(luò)轉(zhuǎn)換器與現(xiàn)場三個(gè)種類的12臺westinghouse儀表通訊，采集電流、電壓、功率等各種物理量的實(shí)時(shí)數(shù)據(jù)
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