PLC The method of scan division processing the PLC instruction

摘要

The present invention relates to a PLC instruction scan segmentation processing method that can minimize the effect on the overall system scan time by dividing the instructions used in the PLC into multiple scans. The PLC instruction scan division processing method of the present invention comprises: (A) when initialization of the communication unit is performed, reading a value of an input contact and storing it in a memory area before starting a program operation; (B) processing the program by dividing the special instructions included in the stored program into multiple scans; And (C) when the operation of the program ends, outputting the data stored in the output image area to the output contact in a batch, and scanning and processing (END).