| 摘要 |
PURPOSE:To prevent the deterioration of the response time of a programmable controller by rewriting only the program that is accordant with the prescribed number of addresses (steps) within a fixed scan time at addition or deletion of programs and performing the adding or deleting operations of all programs in plural scan times. CONSTITUTION:A program (j) is stored in the final address (n+9) of the addresses storing the programs (a)-(j) respectively for each instruction in the present one step. Then the program (j) is rewritten into a rear address (n+10). Hereafter the program (i) of an address (n+8) and the program (h) of an address (n+7) are rewritten into the addresses (n+9) and (n+8) respectively in each step. Then a non-execution instruction (NOP) is written into the head address (n+6) of an unchanged block. Thus the rewriting actions are through in a scan mode. As a result, one scan time is never increased and the deterioration of the response time is avoided for a programmable controller.
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