JPH09282013A - Hierarchizing program generation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a plant control program whose control content is easily understood. SOLUTION: For generating the plant control program by using a program loader, the outline of control is described in a high-order hierarchy (a) and a hierarchizing symbol 1 for describing the detail of control is used in a low- order hierarchy (b) as the symbol for constituting the control program. The screen is opened from (a) to (b) and the content is easily understood.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant control program (also simply referred to as a circuit) operating on a programmable controller (also abbreviated as PLC), and more particularly to a method for creating a hierarchical program.

[0002]

2. Description of the Related Art Conventionally, a plant control program is created by a programmer looking at control specifications and by connecting symbols on the program loader in accordance with the flow of data and signals. That is, the control specification and the plant control program are separately present.

[0003]

However, since the PLC control sequence language is normally used in the plant control program created by the program loader, it is necessary to understand this sequence language to see what kind of control is being performed. There is a problem that only a skilled engineer can understand.
Therefore, an object of the present invention is to provide a program creation method in which the control content can be easily understood.

[0004]

In order to solve such a problem, according to the present invention, when a program control program which operates on a programmable controller is created by a program loader, a high-order symbol is used as a symbol constituting the program. Hierarchical symbols are used to describe the outline of control in the hierarchy and detailed control is used in the lower hierarchy, and the attributes defined in one hierarchy can be handed over to the other hierarchy. That is, by using the hierarchical symbol and providing the inheritance function between the layers of the defined attribute data, it is easy to understand the control content and prevent the attribute data from being inconsistent between the two documents.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram for explaining an embodiment of the present invention. That is, FIG. 1A is a document showing an outline of control specifications, and is an example using a hierarchical symbol 1 of PiD (proportional / integral / derivative) control.
Further, FIG. 1B shows a hierarchical PiD control symbol 1
The example of the detailed definition document of the lower hierarchy of is shown. That is, in the document of FIG. 1A, the flow of data to the PiD control symbol 1 and the positioning of the entire control can be understood. However, since the definition as the PiD control program is insufficient only with this information, the detailed definition document of the lower hierarchy as shown in FIG. 1B is used for the detailed definition.

Therefore, by using a hierarchical symbol in creating a program, an outline of the control specification is displayed as shown in FIG. 1 (a), and then the hierarchical symbol used therein is shown in FIG. 1 (b). By opening like this, it becomes possible to create a program while facilitating the understanding of the control contents. At this time, the content (attribute) information 2 such as TAG, scale, or unit defined in FIG. 1B is inherited in the document in FIG. 1B (called an inheritance function). vice versa,
When the attribute data 2 is changed in FIG. 1 (b), the changed contents have an inheritance function inherited in the document in FIG. 1 (a).
Data will not be inconsistent between upper and lower documents.

[0007]

According to the present invention, a hierarchical symbol is used and a defined attribute data is provided with an inheritance function between upper and lower documents, thereby making it easy to understand the control contents and create a program. In addition to being able to do so, there is an advantage that it is possible to prevent inconsistency between both documents.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining an embodiment according to the present invention.

[Explanation of symbols]

 1 ... Hierarchical symbol, 2 ... Attribute data.

Claims (1)

[Claims] 1. When a program control program that operates on a programmable controller is created by a program loader, an outline of control is described in a higher layer and a detail of control is described in a lower layer as symbols constituting the program. While using layered symbols,
A method for creating a layered program, characterized in that the attributes defined in one layer are passed over to the other layer.