各位大侠,我有一台SIEMENSPG,连接PLC,设置成MPI接口,点击"diagnostic",测试PROFIBUS/MPINETWORKDIAGNOSTICS时出现“Error0x031a:NoactivePROFIBUS/MPInetworkfound.IfyouwanttheCPofthisPCtobetheonlyactivemodule(forexampleinDPmastermode),thesetting<PG/PCistheonlymasteronbus>mustbeactivated.”测试HARDWARE时OK。PLC上出现总线故障。更换MPI电缆,重装系统(WINDOWS2000)和STEP7后仍不行,设备管理器里一切正常。请问是不是硬件问题还是其他原因。