Bailey DCS卡件 Bailey IMPCC01 INFI 90 Prog. Contr. Coupler Module +5VDC 10W
Bailey DCS卡件 Bailey IMPCC01 INFI 90 Prog. Contr. Coupler Module +5VDC 10W
Bailey DCS卡件 Bailey IMPCC01 INFI 90 Prog. Contr. Coupler Module +5VDC 10W
西門子S7-200系列PLC是西門子家族中zui小型的PLC ,除具有的一般功能外,以其強(qiáng)大的通信能力區(qū)別于一般的小型PLC ,可通過網(wǎng)絡(luò),分布系統(tǒng)輕易的完成復(fù)雜的控制要求。S7-200系列PLCCPU在內(nèi)部都集成了一個(gè)或幾個(gè)通信口,通信口標(biāo)準(zhǔn)為RS485口,利用相應(yīng)的電纜就能構(gòu)成具有多種通信功能的復(fù)雜通信網(wǎng)絡(luò)。Super E40系列RTU是安控公司集多年的開發(fā)、工程經(jīng)驗(yàn)設(shè)計(jì)的新型RTU產(chǎn)品,它可實(shí)現(xiàn)對(duì)工業(yè)現(xiàn)場(chǎng)信號(hào)的采集和對(duì)現(xiàn)場(chǎng)設(shè)備的控制。與常用的可編程控制器PLC相比,具有更優(yōu)良的通訊能力。
本項(xiàng)目應(yīng)用到Super E40的A32-M1 CPU模塊、A32-L3通信模塊、AC101模擬量輸入模塊、AC133數(shù)字量輸出模塊、AC141脈沖量輸入模塊。由于缺少模擬量輸出模塊,而單獨(dú)購(gòu)買AO模塊價(jià)格昂貴,所以本文利用西門子S7-200*的自由端口通訊模式與安控RTU通訊,安控將采集到的模擬量經(jīng)過數(shù)據(jù)轉(zhuǎn)換發(fā)送到西門子S7-200PLC中,西門子通過模擬量輸出端口輸出電流,驅(qū)動(dòng)球閥達(dá)到相應(yīng)的球閥開度,具有一定的實(shí)用性。
1 系統(tǒng)概述
本課題來源于本校SRTP項(xiàng)目(大學(xué)生科研訓(xùn)練計(jì)劃項(xiàng)目)和學(xué)校實(shí)驗(yàn)技術(shù)項(xiàng)目,題目為“基于GPRS和RTU的過程控制系統(tǒng)”,該系統(tǒng)是基于PLC模塊技術(shù)構(gòu)造的過程控制系統(tǒng),可用于天然氣和流體調(diào)壓站及管道的安全監(jiān)控等。
該平臺(tái)由一路管道組成,配有壓力變送器,電動(dòng)球閥,差壓計(jì),流量計(jì),溫度變送器,吸水泵及水箱。控制柜單獨(dú)放置,控制柜里安裝安控Super E40系列RTU模塊系統(tǒng)。通過變送器將壓力、溫度等傳感器的信號(hào)轉(zhuǎn)換為標(biāo)準(zhǔn)電信號(hào),經(jīng)由RTU進(jìn)行信號(hào)處理后以有線或無線方式將數(shù)據(jù)傳輸?shù)角爸脵C(jī)進(jìn)行數(shù)據(jù)處理,處理后的控制信號(hào)又送至電動(dòng)球閥并進(jìn)行實(shí)時(shí)動(dòng)作。本項(xiàng)目應(yīng)用到Super E40的A32-M1 CPU模塊、A32-L3通信模塊、AC101模擬量輸入模塊、AC133數(shù)字量輸出模塊、AC141脈沖量輸入模塊,西門子S7-200,系統(tǒng)總體框圖如圖1所示。
2 西門子通訊自由端口模式
CPU的串行通信接口可以由用戶程序控制,這種操作模式稱為自由端口模式。通過使用接收中斷、發(fā)送中斷、字符中斷、發(fā)送指令(XMT)和接收指令(RCV),自由端口通信可以控制S7-200CPU通信口的操作模式。利用自由端口模式,可以實(shí)現(xiàn)用戶定義的通信協(xié)議,連接多種智能設(shè)備。通過SMB30,允許在CPU處于RUN模式時(shí)通信口0使用自由端口模式。CPU處于STOP模式時(shí),停止自由端口通信,通信口強(qiáng)制轉(zhuǎn)換成PPT協(xié)議模式,從而保證了編程軟件對(duì)PLC編程和控制的功能。
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