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 PC has wide application. This article adopts Siemens S7-200 CPU226 as lower machine, industrial computer control system, as the computer is added.the research China used in ndfeb automatic cleaning system.)