描述
当用PLC进行网络设计时，其难度比PLC单机控制大得多。首先你应选用自己较熟悉的机型，对其基本指令和功能指令有较深入的了解，并且指令的执行速度和用户程序存储容量也应仔细了解。否则，不能适应你的实时要求，造成系统崩溃。另外，对通信接口、通信协议
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