6ES5095-8FB016ES5095-8FB01

s7-300plc所帶cp模板與現場tcp/ip設備的連接框架，首先配置s7-300plc作為tcp客戶端，電子臺秤作為tcp服務器端，經客戶端請求服務器端來進行二者的tcpnative連接，連接成功返回后再執行send/receive功能服務，來實現與電子臺秤的雙向數據采集的通信任務。

3.2通訊接口

開放式ie通信伙伴cp的數據通訊是通過“send/recrive”接口模式完成的，其接口基于iso模型1～4層所有的協議，為tcp服務提供了統一的socket接口到每個端口，允許通過工業以太網實現simatic s7 plc與帶以太網端口設備的通訊；選擇功能包ag_send（fc5）和ag_recv（fc6）可用于帶以太網cp343-1模板的s7-300 plc與具有tcp/ip接口的第三方站通信，fc5和fc6功能包含在step7的“simatic_net_cp”庫中，需通過輸入參數“act”激活才可調用，它運行需要多個ob1循環周期并可以在一個連接中同時進行收發通信，cpu將對連接進行監控，一旦連接中斷cpu將自動重新恢復該連接，其通信過程結束標志變量為“done”或“error”，狀態結果變量為“status”，程序可根據這些結果對收發任務進行評估，但只有在同一周期內才有效。

fc5/fc6的輸入參數“id”值可以從step7通信連接屬性對話框的“general”“information”欄中獲得，而“laddr”的值可以從step7硬件配置界面中的工業以太網cp屬性對話框的“addresses”欄獲得，該值應以十六進制的形式填入通信塊，同時也可在編程時點擊fc5/fc6功能的連接屬性，選擇組態列表中的相應連接號，fc5/fc6功能中的id和laddr參數就會在程序里自動生成。

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