| 摘要 |
PROBLEM TO BE SOLVED: To easily detect constituent elements of a program such as commands of an output system affecting other commands, display corresponding portions, and extract and display other commands related to the commands of the output system, etc. SOLUTION: An outline information storage part 34b is provided for recording predetermined constituent elements including output commands constituting a ladder program, together with information about the order of their appearance on the ladder program. A display screen is provided with a ladder display part for displaying the ladder program, an outline information display part for displaying outline information in a tree form in the order of appearance, and a cross-reference information display part. Unique index numbers are assigned to the constituent elements and the outline information is associated with the ladder program by means of the index numbers. A command having the same operand as the command designated on the ladder program displayed in the ladder display part is extracted. Information about the command extracted is displayed in the cross-reference information display part. COPYRIGHT: (C)2006,JPO&NCIPI
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