| 摘要 |
PURPOSE:To quicken the response time and to attain inexpensive and highly reliable device by executing only a required control stage in the process of control according to a sequence control program divided into plural control stages. CONSTITUTION:When a programmable controller executes sequence control, instructions between an instruction written at the head of a section A and an instruction 7 representing the section appearing at first are executed. When the instruction 7 appears, whether or not the execution of the section A is finished is discriminated, and when the execution is finished, the step goes to a section B, and when not finished, the step returns to the start. The control is executed sequentially as sections B, C, D and then restores to the start finally. As to the control stage difficult to apply the step expression, the stage is distinguished as another section X. After instructions at the sections A, X are executed, the section X is executed again and the control stage is transited to the section B at the end. The step returns again to the section X at the end and then instructions in the section C are executed. |
