| 摘要 |
PROBLEM TO BE SOLVED: To allow a control program to be modified without recognizing source codes or descriptions of the control program even in the case of lack of information of the control program.SOLUTION: In response to a function call, program codes of a control program are checked to detect a jump destination address relating to the function call and an address of a return instruction, and sizes of memory areas occupied by respective program codes are detected, and identifiers including sizes and addresses of memory areas assigned to respective first functions are displayed on a display unit. At least one of the first functions is selected to be deleted, and the size and address of the selected first function are stored in an information structure, and a function call for the selected first function is inactivated and/or the selected first function is substituted with a second function, and the program code of the selected first function is overwritten with the program code of the second function. |
