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別于一般的小型PLC ,可通過網絡,分布系統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絡。Super E40系列RTU是安控公司集多年的開發、工程經驗設計的新型RTU產品，它可實現對工業現場信號的采集和對現場設備的控制。與常用的可編程控制器PLC相比，具有更優良的通訊能力。
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過數據轉換發送到西門子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”，該系統是基于PLC模塊技術構造的過程控制系統，可用于天然氣和流體調壓站及管道的安全監控等。
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。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，經由RTU進行信號處理后以有線或無線方式將數據傳輸到前置機進行數據處理，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數字量輸出模塊、AC141脈沖量輸入模塊，西門子S7-200，系統總體框圖如圖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、發送中斷、字符中斷、發送指令（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，可以實現用戶定義的通信協議，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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