| 摘要 |
<p>PROBLEM TO BE SOLVED: To inform an operator of the name of a program changed in its state when operation screens of a plurality of programs operated simultaneously are displayed while overlapping each other. SOLUTION: When the program operation screen is indicated on a display 2, a program name display area 41 is arranged in the lower part of the display screen, and a plurality of program names in operation are indicated in this display area. If a condition change such as an error occurs in a certain operation program, the program name corresponding to this operation program is displayed distinctively from others for informing occurrence of the condition change.</p> |
