IC647NXV000通讯网卡模块全新二手物美价优

IC647NXV000通讯网卡模块全新二手物美价优;
IC647NXV000通讯网卡模块全新二手物美价优;
IC647NXV000通讯网卡模块全新二手物美价优


图12 组态界面
将PM-160添加到STEP7的组态页面后，可以插入相应的数据块进行映像区地址映射。PM-160提供的数据块如下3 PM-160提供的数据块
　推动需要的输入输出数据块到网关对应的槽位。如下图所示，将数据块“24Words Input，24Words Output”拖动到Profibus-DP从站地址为3的PM-160的槽位中，此时，对应的映射区地址分别为256，PLC程序需通过PIW256（PIB256）或者PQW256（PQB256）对相应的数
图14 PLC映像区起始地址（命令配置）
四、 数据读写
1、DCS读写PLC数据
DCS作为Modus主站通过PM-160读写PLC数据，使用04H功能码读数据，对应的寄存器起始地址为0H（30001H），使用10H（03H）功能码写数据，对应的寄存器起始地址为0H（40001H）。
2、PLC读写现场智能仪表数据
1) PLC读写Modbus从站设备数据
PLC通过PM-160发送Modbus主站指令读写现场串口设备数据。映像区起始地址和网关内存映射起始地址对应关系如下
图15 PLC通过PM-160读写Modbus从站设备数据地址对应关系
2) PLC读写非标串口设备数据 PLC的输入映射区前两个字节分别表示接收的串口数据长度和事务序列号，其它为接收到的数据。事务序列号变化，表示接收到了一帧新的串口数据。其中，可通过配置软件设置是否开启串口数据长度功能。PLC的输出映射区前两个字节分别表示发送的串口数据长度和事务序列号，其它为要发送的串口数据。事务序列号变化，PLC发送相应长度的串口数据。
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