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以SIEMENS公司S7-200PLC为例,用VB实现S7-200 PLC在PPI通讯方式下与上位机的通讯。讨论了通讯系统的构成、通讯方式的设置,给出了软件程序。
Take SIEMENS company S7-200PLC as an example, realizes the communication of S7-200 PLC with the host computer in PPI communication mode with VB. The composition of communication system, the setting of communication mode and the software program are discussed.