6FM1785-3AA006FM1785-3AA00

3.3通信組態

為連接組態cp343-1 tcp通訊連接，需使用step7 v5.4和用于工業以太網的simatic net ncm s7，而ncm s7*集成在step7環境中，并可提供豐富的網絡診斷功能，包括：通訊處理器的狀態、一般診斷與統計功能、連接診斷、緩沖區診斷、局域網控制器統計等。cp343-1模板除了在硬件組態hw config中配置外，對本地s7-300 plc而言其每個tcp通訊都需要通過netpro來建立起靜態連接，其組態過程如下：

1）通信伙伴選擇

開放式ie遠程通訊伙伴為稱重儀、標簽打印機、條碼掃描儀等非simatics7工作站，因此選擇使用非特定通信連接的類型unspecified；

2）連接類型

開放式ie通訊連接類型應選擇tcp connection，并定義tcp連接的名字，系統將自動生成塊參數localid和laddr參數，對于客戶端對象還須選擇在通信連接初始化中 具有主動連接功能的選項active connection；

3）ip地址&port端口號分配

對于開放式ie通訊除設置雙方ip地址和子網掩碼外，還須分配通訊雙方（local/remote）的port端口號，port端口定義分配范圍為2000到5000中的空閑地址，而小于2000的端口地址一般由互聯網代理成員管理局（iana）已賦予特定的用途或保留；

4）數據傳送長度

對于老版本的cp343-1具有支持數據長度超過240個字節的作業選項，新版cp已取消了該選項，直接支持zui大可達8192個字節的數據傳送；

5）編譯和下載

當前cp343-1通訊處理器支持在cpu上保存組態數據的選項，而不是存儲到cp的eeprom中，因此今后更換cp模塊時也不需要pg，在cp啟動時，新cp的組態數據將自動從cpu中進行下載。

6）其它

以上未涉及的選擇，按netpro的默認選項。

3.4通信編程

1）稱量采集編程

s7-300plc基于開放通訊的cp343-1模板連接組態不需要編程，而是通過netpro來組建的，因此其通訊編程只需調用面向連接的send/receive接口就可完成ascii數據收發工作，系統的s7plc共有八個tcp連接，其中電子臺秤共有6套分別占有6個連接，臺秤通信過程是雙向應答式的，在每一個連接中完成ascii碼數據的讀和寫功能。

plc1共有八個tcp連接和一個s7單邊連接，其中電子臺秤共有6套分別占有6個連接，臺秤通信過程是雙向應答式的，在每一個連接中完成ascii碼數據的讀和寫功能，通訊協議為電子臺秤自有特定的ascii碼協議，其通信格式如圖5所示。

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