本源码提供了上位机与PLC200的PPI通讯程序，经过试验测试，速度极快，并且此种通讯方式，在PLC端是不需要写通讯程序的，上位机直接对PLC相关的存储位置进行操作-The source host computer and the PLC200 PPI communication program, after a pilot test speed, and that such means of communication do not need to write the communication process, the host computer is directly related to the storage location in the PLC, the PLC side