The lower computer in the system is SPM2,Siemens PROFIBUS mulitiplexer,and the upper one uses a PC with the special PROFIBUS communication card,CP5611,which results in increasing of distribution,reliability and expansibility.

• 系统的下位机采用Siemens公司的新型简单从站协议芯片SPM2；上位机采用安装了专用PROFIBUS通信卡CP5611的PC机；较好地实现了系统的分布性、可靠性与可扩展性.