| 摘要 |
This execution time estimation program causes a computer to: extract each combination of a software instruction executed by firmware and the execution condition for the software instruction from a ladder program, and set the extracted combination as a set of combination information; generate device-sharing groups, or first combination groups, each of which is a group of sets of combination information that specify execution conditions that are established using the same device; generate simultaneous execution groups, or second combination groups, which are selected from each device-sharing group, and which each consist of sets of combination information that specify software instructions that may be executed at the same time; extract, from among the simultaneous execution groups in each device-sharing group, the simultaneous execution group that requires the longest software instruction execution time; and on the basis of the software instruction execution time that it takes to complete execution of each extracted simultaneous execution group, calculate the longest scan time, which is the longest possible execution time required to execute the entire ladder program. |
