在工业控制过程中,PLC作为下位机,PC机作为上位机,PLC与PC机之间通过串口通信传递数据具有广泛的运用.文章就采用西门子S7-200 CPU226作为下位机,研华工控机作为上位机组成控制系统,用于钕铁硼自动清洗系统.(In the process of industrial control, PLC as lower machine, PC as upper machine, transfer data through serial communication between PLC and