A kind of slave design scheme was put forward that uses the EtherCAT Piggyback controller boards FB11110141 from BECKHOFF and PIC24HJ128GP506 microcontroller unit (MCU) in order to achieve high realtime and high rate.The microprocessor and the EtherCAT piggyback controller boards FB11110141 for slave development using SPI communication mode,the master and slave were configured.The research results show that the system eventually can operate stably,and EtherCAT can implement communication.