6FM1785-3AA006FM1785-3AA00
3.3通信組態(tài)
為連接組態(tài)cp343-1 tcp通訊連接，需使用step7 v5.4和用于工業(yè)以太網(wǎng)的simatic net ncm s7，而ncm s7*集成在step7環(huán)境中，并可提供豐富的網(wǎng)絡(luò)診斷功能，包括：通訊處理器的狀態(tài)、一般診斷與統(tǒng)計(jì)功能、連接診斷、緩沖區(qū)診斷、局域網(wǎng)控制器統(tǒng)計(jì)等。cp343-1模板除了在硬件組態(tài)hw config中配置外，對(duì)本地s7-300 plc而言其每個(gè)tcp通訊都需要通過(guò)netpro來(lái)建立起靜態(tài)連接，其組態(tài)過(guò)程如下：
1）通信伙伴選擇
開(kāi)放式ie遠(yuǎn)程通訊伙伴為稱重儀、標(biāo)簽打印機(jī)、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(kāi)放式ie通訊連接類型應(yīng)選擇tcp connection，并定義tcp連接的名字，系統(tǒng)將自動(dòng)生成塊參數(shù)localid和laddr參數(shù)，對(duì)于客戶端對(duì)象還須選擇在通信連接初始化中 具有主動(dòng)連接功能的選項(xiàng)active connection；
3）ip地址&port端口號(hào)分配
對(duì)于開(kāi)放式ie通訊除設(shè)置雙方ip地址和子網(wǎng)掩碼外，還須分配通訊雙方（local/remote）的port端口號(hào)，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(lián)網(wǎng)代理成員管理局（iana）已賦予特定的用途或保留；
4）數(shù)據(jù)傳送長(zhǎng)度
對(duì)于老版本的cp343-1具有支持?jǐn)?shù)據(jù)長(zhǎng)度超過(guò)240個(gè)字節(jié)的作業(yè)選項(xiàng)，新版cp已取消了該選項(xiàng)，直接支持zui大可達(dá)8192個(gè)字節(jié)的數(shù)據(jù)傳送；
5）編譯和下載
當(dāng)前cp343-1通訊處理器支持在cpu上保存組態(tài)數(shù)據(jù)的選項(xiàng)，而不是存儲(chǔ)到cp的eeprom中，因此今后更換cp模塊時(shí)也不需要pg，在cp啟動(dòng)時(shí)，新cp的組態(tài)數(shù)據(jù)將自動(dòng)從cpu中進(jìn)行下載。
6）其它
以上未涉及的選擇，按netpro的默認(rèn)選項(xiàng)。
3.4通信編程
1）稱量采集編程
s7-300plc基于開(kāi)放通訊的cp343-1模板連接組態(tài)不需要編程，而是通過(guò)netpro來(lái)組建的，因此其通訊編程只需調(diào)用面向連接的send/receive接口就可完成ascii數(shù)據(jù)收發(fā)工作，系統(tǒng)的s7plc共有八個(gè)tcp連接，其中電子臺(tái)秤共有6套分別占有6個(gè)連接，臺(tái)秤通信過(guò)程是雙向應(yīng)答式的，在每一個(gè)連接中完成ascii碼數(shù)據(jù)的讀和寫功能。
plc1共有八個(gè)tcp連接和一個(gè)s7單邊連接，其中電子臺(tái)秤共有6套分別占有6個(gè)連接，臺(tái)秤通信過(guò)程是雙向應(yīng)答式的，在每一個(gè)連接中完成ascii碼數(shù)據(jù)的讀和寫功能，通訊協(xié)議為電子臺(tái)秤自有特定的ascii碼協(xié)議，其通信格式如圖5所示。
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