Graph display device, graph display method, and recording medium

A graph display method that causes a computer to execute:

• acquiring dependency relation information indicating a dependency relation of each of a plurality of device variables specified by a control program which is divided into a plurality of subprograms, the control program including a plurality of commands for controlling operations of a plurality of devices included in a production line, the plurality of commands including a plurality of variables, and the plurality of variables corresponding to the plurality of device variables corresponding to the devices;
• generating a first directed graph, which comprises a plurality of first nodes respectively representing the device variables and edges representing existence of the dependency relation, and a second directed graph, which comprises the plurality of first nodes, the edges, and a plurality of regions respectively corresponding to the subprograms, on the basis of the acquired dependency relation information, each of the first nodes being arranged in a region of a subprogram that uses the device variable to be expressed from among the plurality of regions in the second directed graph;
• and
• causing a display device to switch between displaying the generated first directed graph and displaying the generated second directed graph in response to an instruction from a user.

A non-transitory computer readable recording medium storing a graph display program that causes a computer to execute:

• acquiring dependency relation information indicating a dependency relation of each of a plurality of device variables specified by a control program which is divided into a plurality of subprograms, the control program including a plurality of commands for controlling operations of a plurality of devices included in a production line, the plurality of commands including a plurality of variables, and the plurality of variables corresponding to the plurality of device variables corresponding to the devices;
• generating a first directed graph, which comprises a plurality of first nodes respectively representing the device variables and edges representing existence of the dependency relation, and a second directed graph, which comprises the plurality of first nodes, the edges, and a plurality of regions respectively corresponding to the subprograms, on the basis of the acquired dependency relation information, each of the first nodes being arranged in a region of a subprogram that uses the device variable to be expressed from among the plurality of regions in the second directed graph;
• and
• causing a display device to switch between displaying the generated first directed graph and displaying the generated second directed graph in response to an instruction from a user.