An engineering tool program causes a computer function as a content-data storing section that stores data in which content classes indicating classifications of content data to be displayed by an engineering tool and types of monitor screens that display the content data are associated, a content-relation managing section that stores content relation management data indicating a hierarchical relation of layers among different content classes, and a display control section that changes, when detecting that first operation is performed, a monitor screen being displayed to a monitor screen corresponding to a content class of an immediately subordinate layer on the basis of the content relation management data and changes, when detecting that second operation is performed, the monitor screen being displayed to a monitor screen corresponding to a content class of an immediately superordinate layer on the basis of the content relation management data.

A program comparison apparatus includes: a set alignment unit that divides a comparison source-program which is a first FBD program into sets of program components connected to one another, and rearranges the sets in a line along a Y-axis direction which is a vertical direction in ascending order of execution, and also divides a comparison edited-program which is a second FBD program into sets of program components connected to one another, and rearranges the sets in a line along the Y-axis direction in ascending order of execution; a difference detection unit that detects a difference in the sets between the comparison source-program and the comparison edited-program rearranged as difference information; and a difference display control unit that causes the sets of the comparison source-program and the comparison edited-program that are rearranged to be displayed within a screen of a display device.

A program comparison apparatus includes: a set alignment unit that divides a comparison source-program which is a first FBD program into sets of program components connected to one another, and rearranges the sets in a line along a Y-axis direction which is a vertical direction in ascending order of execution, and also divides a comparison edited-program which is a second FBD program into sets of program components connected to one another, and rearranges the sets in a line along the Y-axis direction in ascending order of execution; a difference detection unit that detects a difference in the sets between the comparison source-program and the comparison edited-program rearranged as difference information; and a difference display control unit that causes the sets of the comparison source-program and the comparison edited-program that are rearranged to be displayed within a screen of a display device.

Provided is a production system, comprising circuitry configured to: associate a plurality of rungs included in a ladder program with one of a plurality of scan groups each having an execution cycle that is specifiable; allocate each of the plurality of scan groups to one of a plurality of processor cores of a controller so that each of the plurality of scan groups is distributed; and execute one or more rungs associated with one or more scan groups allocated to each of the plurality of processor cores in parallel in each of the execution cycles.

Provided is a production system, comprising circuitry configured to: associate a plurality of rungs included in a ladder program with one of a plurality of scan groups each having an execution cycle that is specifiable; allocate each of the plurality of scan groups to one of a plurality of processor cores of a controller so that each of the plurality of scan groups is distributed; and execute one or more rungs associated with one or more scan groups allocated to each of the plurality of processor cores in parallel in each of the execution cycles.

A system for processing dental prostheses that can efficiently manage multiple prostheses and multiple milling machines includes an input unit into which commands for operating functions of the dental prosthesis processing system are input; a display unit configured to display states of prostheses processed in the dental prosthesis processing system and milling machines used in the dental prosthesis processing system; a calculation and control unit equipped with CAM software and configured to control the milling machines according to a command input of a user via the input unit and fabricate a prosthesis; and two or more milling machines configured to process a workpiece into a shape of a prosthesis according to a command from the calculation and control unit and transfer their own state information to the calculation and control unit.