| 摘要 |
PROBLEM TO BE SOLVED: To reduce the illegal portions in a ladder program that have slipped through a check.SOLUTION: A ladder program syntactic analysis tool 2 makes a ladder program 11 loaded by a ladder program loading processing unit 21, and a ladder program simulate processing unit 23 simulates logic on the basis of a memory reference instruction and a memory update instruction included in the ladder program and instruction function definition data 22. An instruction extraction processing unit 24 extracts a memory reference range and a memory update range from the memory reference instruction and memory update instruction that are extracted by execution of simulation, a memory access analysis processing unit 25 analyzes a memory access location on the basis of the extracted memory reference range and memory update range, and a screen display processing unit 26 edits the analyzed result and creates an analysis result display screen 3.SELECTED DRAWING: Figure 1 |
