Ladder program editor

A ladder program editor configured to edit a ladder program, the ladder program editor comprising:

• an editing control unit configured to manage a virtual drawing area or a space in which the ladder program is virtually located and which is formed as a set of a plurality of rectangular areas;
• a pasting object specifying unit configured to specify a partial circuit as an object of pasting;
• a reference area specifying unit configured to specify a reference area, in the virtual drawing area, to serve as a reference for pasting the partial circuit;
• a pasting method specifying unit configured to specify a pasting position and a pasting method for the partial circuit based on the reference area;
• a pasting area insertion unit configured to insert a pasting area for pasting the partial circuit into the virtual drawing area based on the pasting position and the pasting method specified by the pasting method specifying unit;
• a pasting processing unit configured to paste the partial circuit on the pasting area;
• and
• a connecting line adjustment unit configured to interpolate a connecting line or lines and delete a superfluous connecting line or lines in the virtual drawing area.