1、RAC3.5-200-460-L00-W1-220引言
basic語言是微機(jī)系統(tǒng)中廣泛應(yīng)用的一種高級編程語言，它的指令接近思維邏輯的表達(dá)，與自然語言有相通之處，易學(xué)易懂，同時(shí)它包涵豐富的算法函數(shù)，能十分方便地進(jìn)行各種數(shù)據(jù)處理，因而深受廣大編程愛好者喜愛。plc是計(jì)算機(jī)科學(xué)在工業(yè)控制領(lǐng)域內(nèi)的一個(gè)重要分支，它一般采用梯形圖、語句表作為其編程語言，由于梯形圖形似電氣原理圖，直觀易懂，易為電氣工程師所接受，為plc的推廣應(yīng)用起到了極大的推動作用。plc從誕生至今，幾十年來，應(yīng)用領(lǐng)域不斷擴(kuò)大，現(xiàn)在，通訊問題已成為plc應(yīng)用中的一個(gè)重要課題之一。
本文以gefanucplc系列pcm智能通訊模塊在某泵站控制系統(tǒng)中的應(yīng)用為例進(jìn)行探討，介紹了basic語言在解決plc與現(xiàn)場儀表或其它外部智能設(shè)備之間數(shù)據(jù)通訊問題時(shí)能起到的作用，為廣大同行提供又一種串行通訊解決方案。
2、RAC3.5-200-460-L00-W1-220系統(tǒng)簡述
本系統(tǒng)采用gefanuc90-30系列plcmodel351，一塊智能通訊模塊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。
RAC3.5-200-460-L00-W1-220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。
RAC3.5-200-460-L00-W1-220系統(tǒng)布置要求敘述如下：
plccpu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）mintii網(wǎng)絡(luò)轉(zhuǎn)換器相連，負(fù)責(zé)通過mintii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)，同時(shí)，com1在調(diào)試完畢后用來與現(xiàn)場一臺三菱fx2nplc通訊，實(shí)現(xiàn)從geplc系統(tǒng)到fx2n系統(tǒng)的數(shù)據(jù)通路，方案圖如圖1所示。
2.1minitii轉(zhuǎn)換器通訊協(xié)議簡介
RAC3.5-200-460-L00-W1-220在這個(gè)方案中，minitii與下位設(shè)備的硬件連接為雙絞線，minitii及下位各設(shè)備都并入雙絞線組成的westinghouseincom網(wǎng)絡(luò)，在該網(wǎng)絡(luò)中各通訊主體使用二進(jìn)制通訊方式，數(shù)據(jù)幀均由33位二進(jìn)制數(shù)構(gòu)成，minitii充當(dāng)主站（master）角色，對下位各設(shè)備發(fā)起通訊，進(jìn)行輪詢。
pcm311模塊與minitii轉(zhuǎn)換器進(jìn)行的是ascii碼通訊方式，而minitii轉(zhuǎn)換器與下位dt3000、mp3000、iq200各系列設(shè)備的通訊方式為二進(jìn)制碼通訊，實(shí)際上minitii所起到的作用是將pcm模塊發(fā)出的ascii碼指令幀轉(zhuǎn)譯為二進(jìn)制碼指令幀，當(dāng)然，在通訊過程中，我們只需關(guān)心ascii碼通訊幀的格式，minitii會自動將其轉(zhuǎn)為二進(jìn)制格式后發(fā)到incom網(wǎng)絡(luò)中去。
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RAC3.5-200-460-L00-W1-220
RAC2.2-200-460-L00-W1
RAC2.3-200-460-A01-W1
RAC2.1-200-300
RAC3.5
RAC2.1
RAC1.2-250-380-A00-W1
RAC2.2-200-450-AP0-W1
RAC2.3-200-380-A00-300A
RAC3.1-150-460-AP0-W1-220
RAC3.1-150A
RAC3.5-150-460-A-OI-Z1-220
RAC3.5-150-460-L-00-WI
RAC3.5-150-460-A-0I-W1
RAC3.5-150-460-A-00
RAC3.5-150-460
RAC3.1-150-460-A-00
RAC2.2-250-460-A-00-WI
RAC2.2-200-460-A-00-W1
RAC2.2-200-460
RAC2.2-150-460-A-OO-WI
RAC2.2-150-460
RAC2.1-200-380A
RAC2.1-150-380-A00-W1
RAC2.1-150-380
RAC3.5-150-460-A00-W12
RAC2.2-150-380-A00-W1
RAC2.2-150-460-A00-W1
RAC2.2-200-380-A00-W1
RAC2.2-200-460-D00-W1
RAC2.2-250-380-A00-W1
RAC2.2-250-460-AP0-W1
RAC2.2-200-380-A00-Z1
RAC2.2-250-380-A00-Z1
RAC2.2-150-460-A00-Z1
RAC2.2-200-460-A00-Z1
RAC2.2-250-460-A00-Z1
RAC2.2-200-380-AP0-W1
RAC2.2-200-460-A00-W1
RAC2.2-250-460-A00-W1
RAC2.2-200-460-AP0-W1
RAC2.2-250-380-API-W1
RAC2.2-200-460-APD-W1
RAC2.2-150-380-AP0-W1
RAC2.2-200-380-A0I-W1
RAC2.2-150-380-A0I-W1
RAC2.2-250-380-A0I-W1
RAC3.1-100-460-A00-W1-220
RAC3.1-100-460-AP0-W1-220
RAC3.1-100-460-APD-W1-220
RAC3.1-100-460-A00-Z1-220
RAC3.1-150-460-A00-Z1-220
RAC3.1-100-460-API-W1-220
RAC3.1-100-460-A0I-W1-220
RAC3.1-100-460-D00-W1-220
RAC3.1-150-460-A00-W1-220
RAC3.1-150-460-AP0-W1-220
RAC3.1-150-460-APD-W1-220
RAC3.1-150-460-API-W1-220
RAC3.1-150-460-A0I-W1-220
RAC3.1-150-460-D00-W1-220
RAC2.2-250-380-A0S-W1
RAC2.2-200-380-A0S-W1
RAC3.1-150-460-A0S-W1-220
RAC2.2-150-380-A0D-W1
RAC2.2-250-380-A0I-Z1
RAC3.5-100-460-A00-W1-220
RAC3.5-150-460-A00-Z1-220
RAC3.5-100-460-A01-W1-220
RAC4.3-400-460-AP0-W1
RAC3.5-150-460-A00-W1-220
RAC3.5-150-460-A00-Z1-220
RAC3.5-150-460-A0I-W1-220
RAC3.1-150-460-100-W1-220
RAC2.1-150-460-A0I-W1-220
RAC3.5-200-460-L00-Z1-220
RAC3.6-150-460-L00-Z1-2
RAC2.3-250-460-L00-W1
RAC2.3-200-460-L00-W1
RAC2.2-200-460-A00-W1
RAC2.2-200-460-L00-W1
RAC3.5-200-460-L00-W1-220
RAC3.5-150-460-L00-W1-220
RAC3.1-150-460-A0I-Z1-220
RAC3.5-150-460-A01-W1-220
256047-02738-A04
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New Bently Nevada 50mm Transducer Proximitor 24765-02-01 247650201
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