6ES5095-8FB016ES5095-8FB01

6ES5095-8FB016ES5095-8FB01

s7-300plc所带cp模板与现场tcp/ip设备的连接框架，首先配置s7-300plc作为tcp客户端，电子台秤作为tcp服务器端，经客户端请求服务器端来进行二者的tcpnative连接，连接成功返回后再执行send/receive功能服务，来实现与电子台秤的双向数据采集的通信任务。

3.2通讯接口

开放式ie通信伙伴cp的数据通讯是通过“send/recrive”接口模式完成的，其接口基于iso模型1～4层所有的协议，为tcp服务提供了统一的socket接口到每个端口，允许通过工业以太网实现simatic s7 plc与带以太网端口设备的通讯；选择功能包ag_send（fc5）和ag_recv（fc6）可用于带以太网cp343-1模板的s7-300 plc与具有tcp/ip接口的第三方站通信，fc5和fc6功能包含在step7的“simatic_net_cp”库中，需通过输入参数“act”激活才可调用，它运行需要多个ob1循环周期并可以在一个连接中同时进行收发通信，cpu将对连接进行监控，一旦连接中断cpu将自动重新恢复该连接，其通信过程结束标志变量为“done”或“error”，状态结果变量为“status”，程序可根据这些结果对收发任务进行评估，但只有在同一周期内才有效。

fc5/fc6的输入参数“id”值可以从step7通信连接属性对话框的“general”“information”栏中获得，而“laddr”的值可以从step7硬件配置界面中的工业以太网cp属性对话框的“addresses”栏获得，该值应以十六进制的形式填入通信块，同时也可在编程时点击fc5/fc6功能的连接属性，选择组态列表中的相应连接号，fc5/fc6功能中的id和laddr参数就会在程序里自动生成。

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