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,以其強大的通信能力區(qū)別于一般的小型PLC ,可通過網(wǎng)絡,分布系統(tǒng)輕易的完成復雜的控制要求。S7-200系列PLCCPU在內部都集成了一個或幾個通信口,通信口標準為RS485口,利用相應的電纜就能構成具有多種通信功能的復雜通信網(wǎng)絡。Super E40系列RTU是安控公司集多年的開發(fā)、工程經(jīng)驗設計的新型RTU產(chǎn)品，它可實現(xiàn)對工業(yè)現(xiàn)場信號的采集和對現(xiàn)場設備的控制。與常用的可編程控制器PLC相比，具有更優(yōu)良的通訊能力。
本項目應用到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，而單獨購買AO模塊價格昂貴，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，驅動球閥達到相應的球閥開度，具有一定的實用性。
1 系統(tǒng)概述
本課題來源于本校SRTP項目(大學生科研訓練計劃項目)和學校實驗技術項目，題目為“基于GPRS和RTU的過程控制系統(tǒng)”，該系統(tǒng)是基于PLC模塊技術構造的過程控制系統(tǒng)，可用于天然氣和流體調壓站及管道的安全監(jiān)控等。
該平臺由一路管道組成，配有壓力變送器，電動球閥，差壓計，流量計，溫度變送器，吸水泵及水箱。控制柜單獨放置，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轉換為標準電信號，經(jīng)由RTU進行信號處理后以有線或無線方式將數(shù)據(jù)傳輸?shù)角爸脵C進行數(shù)據(jù)處理，處理后的控制信號又送至電動球閥并進行實時動作。本項目應用到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，可以實現(xiàn)用戶定義的通信協(xié)議，連接多種智能設備。通過SMB30，允許在CPU處于RUN模式時通信口0使用自由端口模式。CPU處于STOP模式時，停止自由端口通信，通信口強制轉換成PPT協(xié)議模式，從而保證了編程軟件對PLC編程和控制的功能。
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