| 摘要 |
PURPOSE:To form easily a program, by providing an instruction executing order analysis circuit and a circuit displaying a ladder circuit two-dimensionally so as to form and change freely the program without considering the order of execution of instructions by the programmer. CONSTITUTION:The information comprising components such as contact, coil and various operating instructions formed on a CRT display section 14 is displayed and a refresh memory 16 storing the components and the connecting information is provided corresponding to the displayed ladder circuit. The components and the connecting information from the memory 16 are inputted to the instruction executing order analysis section 23. The components and the connecting information are stored temporarily to a stack register 18 if the analysis section 23 and the branch information is stored in a branch stack 19. Then, the components are analyzed at an instruction executing order analysis circuit 17 of the analysis section 23 in the order of execution, the order of execution is rearranged with the result of analysis and stored in a memory circuit 21. The content of the memory circuit 21 is loaded in a sequence controller 22 so as to make the forming of the program easy. |
