| 摘要 |
<p>PURPOSE:To shorten the cycle time by counting the time until a divided program of a program having a lower priority is terminated after this program is interrupted and displaying the counted value on a CRT. CONSTITUTION:Programs in the first and second levels are executed at the period of a prescribed time (for example, 8ms), and one cycle consists of three periods. The program in the first level is processed preferentially, and all of this program is executed in the early stage of 8ms. Since the program in the second level is not all processed, the program is divided, and the first-third divided programs are executed in the first-third periods. When the program in the second level is executed, a counter provided in a programmable controller 2 is cleared by the start of the program to start counting till the end of the divided program, and the counted value is displayed on a CRT of a CRT/MDI (CRT and manual data input device) 3. Thus, the actual operation time of the program in the second level is detected, and programs which shorten the cycle time are generated, and a CPU of the programmable controller is used effectively.</p> |
