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　　根據本公司無負壓管網增壓設備的特點，采用西門子 S7-200 SMART、SMART LINE 和 V20 變頻器的全套解決方案。文中對設備的工藝流程進行了分析，使用一控二的方式達到了良好的控制效果，V20 變頻器通過 Modbus 與 S7-200 SMART 進行通訊，驅動無負壓管網增壓設備，保證了用戶對恒壓管網供水的要求。在軟件方面采用了 S7-200 SMART PID 控制方式，實現了對無負壓管網增壓設備的完美控制。
　　關鍵詞：S7-200 SMART，SMART LINE，V20，無負壓管網增壓設備
　　1. 項目簡介
　　隨著我國物質文明生活水平的提高，高層建筑越來越多，自來水管網壓力出現不足，很多城市普遍存在著用水高峰期上不去水的現象。由此引發生活、辦公用水難的問題。無負壓管網增壓設備可直接與自來水管網串接而不產生負壓，能夠安全、衛生的向用戶供水。該設備充分利用了市政自來水管網的原有壓力，在原有壓力的基礎上實現壓力疊加，差多少，補多少，使二次加壓設備的選型減小，節省投資，同時在使用過程中也可節能很大一筆費用，是目前最先進最新型的二次供水方式。
　　該設備采用 SIMATIC S7-200 SMART + SMART LINE + V20 變頻器。優良的工藝造就了高質量的產品，強大的技術支持保證了產品的高性能。SIMATIC S7-200 SMART 與 SMART LINE 上添加的以太網口，方便了調試程序，不用頻繁的插拔電纜，節省了下載程序的時間。V20 變頻器的宏指令調用功能，可快速實現參數設置。V20 變頻器的小體積與上進下出的接線方式，節省了所占用的空間，便捷的接線方式，強大的功能，簡潔的操作方式，體現了基本型變頻器的發展趨勢。
　設備選型為一控二。自動運行時 SIMATIC S7-200 SMART 驅動 V20 變頻器。通過變頻器拖動一臺泵升速，一臺泵運行到某個頻率能夠達到目標壓力，則單臺泵進行恒壓供水。如果單臺泵運行到 50Hz，經過延時進行切換，一臺工頻、一臺變頻運行，目標壓力為用戶設定壓力。通過觸摸屏可以查詢以及更改參數。可以查詢某一時間段的故障以及故障時間。觸摸屏還設計了手動控制系統的啟停。
　　3、 方案確定
　　由于該無負壓供水設備系統屬于成熟機的升級，客戶比較傾向于性價比高的產品。SIMATIC S7-200 SMART、SMART LINE、V20 作為西門子新一代研產品具有良好的性價比。SIMATIC S7-200 SMART、SMART700IE 本身具有集成的以太網口，既方便了技術人員的調試，又方便了設備連接到工廠的網絡上。SIMATIC S7-200 SMART 還有可擴展的 RS485 接口，方便了現場通訊口使用。
　　a)、設備接通電源，SIMATIC S7-200 SMART 電源信號燈亮，SMART LINE 處于待機工作模式，系統通過 SA1 分為手動與自動模式。
　　b)、SA1 轉換打到自動模式：手動模式是操作人員就地控制每臺水泵的啟停。手動運行可選擇為手動變頻或者手動工頻。手動變頻運行的時，只能運行一臺水泵，需要操作人員通過電位器控制頻率的升降。
　　c)、SA1 轉換打到自動模式：自動模式又分為屏手動與屏自動。屏手動是操作人員通過 SMART LINE 控制相對應的每臺泵的輸出。屏自動控制需要操作人員把相關的參數設置完全,系統會判斷當前的實際數值與操作員設置的數值進行比較，判斷管網壓力是小于設定壓力還是高于設定壓力。

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