Controller for controlling an industrial machine using a program

A controller controlling an industrial machine using a program, the controller comprising:

• a display device;
• a non-transitory memory that stores
• programs including at least one program from which another program can is called and executed;
• at least a folder search priority order setting defining an order of priority in which folders are searched when the another program is called;
• and
• call information, which is information relating to a correspondence relationship between a call source program and a call destination program among the programs stored in advance in the non-transitory memory;
• and
• a processor configured to:
• in response to a possibility that a correspondence relationship between the programs has changed, generate call information using the programs and the folder search priority order setting;
• determine whether or not the correspondence relationship between the programs has changed by comparing the generated call information with the call information stored in the non-transitory memory;
• and
• in response to determining that the correspondence relationship between the programs has changed, output a warning to the display device to facilitate ascertaining a change in the correspondence relationship between the programs, thereby forestalling unintended machining during actual machining, damage to the industrial machine, or an injury to staff.