9.4 Receiving Operation9-139.4.4 Operations of the "Reception done copy" flag and multiplex reception Operation and function of the "reception done copy" flag (X4, X5, X6, X7) The "reception done copy" flag (X4, X5, X6, X7) turns ON when the GPRECV instruction isexecuted and data are copied from the reception buffer to the specified operation memory,and turns OFF when the END instruction is executed. Processing in the case of multiplex reception If the time from the reception of data in the reception buffer to the subsequent data receptionis shorter than the PLC scan time, and the receiving frequency is high, it is possible that thereception done flag (X0, X1, X2, X3) remains ON and cannot detect sequential receptions. In cases where it is necessary to process sequentially received data, constantly execute theGPRECV instruction, in combination with the "reception done copy" flag (X4, X5, X6, X7). Referring to the "reception done copy" flag (X4, X5, X6, X7), you can confirm whether thereare lately received data.Receptiondone flag(X0, X1, X2, X3)ExecuteGPRECVinstructionReception donecopy flag(X4, X5, X6, X7)Receptionbuffer data C RC R1 scan timeIn the case of sequential receptions, thereception done flag (X0, X1, X2, X3) remains ON.After always executing GPRECV instruction, confirmwhether there are lately received data referring to thereception done copy flag (X4, X5, X6, X7).Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
