6FM1785-3AA006FM1785-3AA00
3.3通信组态
为连接组态cp343-1 tcp通讯连接，需使用step7 v5.4和用于工业以太网的simatic net ncm s7，而ncm s7*集成在step7环境中，并可提供丰富的网络诊断功能，包括：通讯处理器的状态、一般诊断与统计功能、连接诊断、缓冲区诊断、局域网控制器统计等。cp343-1模板除了在硬件组态hw config中配置外，对本地s7-300 plc而言其每个tcp通讯都需要通过netpro来建立起静态连接，其组态过程如下：
1）通信伙伴选择
开放式ie远程通讯伙伴为称重仪、标签打印机、条码扫描仪等非simatics7工作站，因此选择使用非特定通信连接的类型unspecified；
2）连接类型
开放式ie通讯连接类型应选择tcp connection，并定义tcp连接的名字，系统将自动生成块参数localid和laddr参数，对于客户端对象还须选择在通信连接初始化中 具有主动连接功能的选项active connection；
3）ip地址&port端口号分配
对于开放式ie通讯除设置双方ip地址和子网掩码外，还须分配通讯双方（local/remote）的port端口号，port端口定义分配范围为2000到5000中的空闲地址，而小于2000的端口地址一般由互联网代理成员管理局（iana）已赋予特定的用途或保留；
4）数据传送长度
对于老版本的cp343-1具有支持数据长度超过240个字节的作业选项，新版cp已取消了该选项，直接支持zui大可达8192个字节的数据传送；
5）编译和下载
当前cp343-1通讯处理器支持在cpu上保存组态数据的选项，而不是存储到cp的eeprom中，因此今后更换cp模块时也不需要pg，在cp启动时，新cp的组态数据将自动从cpu中进行下载。
6）其它
以上未涉及的选择，按netpro的默认选项。
3.4通信编程
1）称量采集编程
s7-300plc基于开放通讯的cp343-1模板连接组态不需要编程，而是通过netpro来组建的，因此其通讯编程只需调用面向连接的send/receive接口就可完成ascii数据收发工作，系统的s7plc共有八个tcp连接，其中电子台秤共有6套分别占有6个连接，台秤通信过程是双向应答式的，在每一个连接中完成ascii码数据的读和写功能。
plc1共有八个tcp连接和一个s7单边连接，其中电子台秤共有6套分别占有6个连接，台秤通信过程是双向应答式的，在每一个连接中完成ascii码数据的读和写功能，通讯协议为电子台秤自有特定的ascii码协议，其通信格式如图5所示。
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