西门子PLC多个站点MODBUS轮询通讯.pdf

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1、CP341ModbusRTU多站点轮询CP341ModbusRTUPollingMulti-SlavesGetting-StartedEdition(2009年7月)摘要本文档讨论使用CP341实现Modbus主站轮询多个从站关键词CP341,ModbusRTU，轮询，功能码KeyWordsCP341，ModbusRTU,Polling，FunctionCodeIA&DTService&SupportPage2-16目录目录........................................

2、.......................................................................................31.软件环境........................................................................................................................41.1STEP7V5.4SP3........................

3、................................................................................41.2CPPtPParamV5.1SP8............................................................................................41.3CPPTPModbusMasterV3.1.4..................................

4、................................................42.硬件列表........................................................................................................................43.组态配置........................................................................

5、................................................43.1组态CPU及CP341......................................................................................................43.2设置Modbus总线传输速率和帧字符结构.................................................................

6、....53.3设置电气接口..............................................................................................................64.编程.............................................................................................................................

7、...64.1创建发送数据块DB1...................................................................................................64.2创建接收数据DB.........................................................................................................64.3创建轮询功能块FC1.......

8、.............................................................................................74.4在OB1中调用轮询功能块FC1...................................................................................145.总结.....................