The rudder program optimization device and rudder program

摘要

PROBLEM TO BE SOLVED: To provide a ladder program optimization apparatus that can automatically optimize created and edited ladder programs and can extend the range of optimization.;SOLUTION: The ladder program optimization apparatus has a program optimization means 402 for replacing device expressions of a plurality of circuit blocks having the same instruction configuration and device type and different device numbers in a program analyzed by a ladder program analysis means 401, to handle them as a common subexpression, and checking whether the replaced program has a reduced program size and maintains processing equivalence even after the replacement.;COPYRIGHT: (C)2008,JPO&INPIT