Ladder display device for circuit generation using touch panel

A ladder display device in which a ladder program is edited by a gesture operation performed on a touch panel on which the ladder program is displayed in a form of a ladder diagram, the ladder display device comprising a processor to implement:

• a ladder circuit storage unit that stores an insertion condition including at least an operation start position of the gesture operation, an operation end position of the gesture operation, and a circuit state of a net on the ladder diagram related to the gesture operation as insertion target ladder circuit information in association with a ladder circuit that is an insertion target, wherein the circuit state of the net specifies conditions for a type of elements of the ladder circuit arranged in the net, a number of elements of each type, or whether an address has been set for each element forming the ladder circuit;
• a ladder circuit condition determination unit that, with reference to the ladder circuit storage unit, determines a ladder circuit whose insertion condition is satisfied by the gesture operation performed on the touch panel;
• a ladder circuit generation unit that generates the ladder circuit determined by the ladder circuit condition determination unit as the gesture operation satisfying an insertion condition;
• and
• an edition control unit that inserts the ladder circuit generated by the ladder circuit generation unit into the ladder program.