JPH064111A - Programmable controller programming device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the time spent for inputting a ladder program, facilitate the change processing of the ladder program, and improve maintainability. [Structure] When a ladder program 203 composed of a relay circuit instruction of a programmable controller is created, the relation of each signal can be input in a table format (hereinafter referred to as table format programming), and its signal definition table
By inputting 01 to the converter 202, the ladder program 203 is automatically generated. Also,
A signal definition sub-table 204 can be attached to the signal definition table 201, and complex signals can be grouped so as to be simple and easy to see.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller installed at a manufacturing site such as a steel plant, a chemical plant and a papermaking plant, and more particularly to an apparatus for automatically generating a ladder program composed of relay circuit instructions. .

[0002]

2. Description of the Related Art In a conventional programmable controller programming method, as shown in FIG. 1, a creator 103 creates a ladder program 102 (for example, an interlock program for each equipment machine) which is composed of relay circuit instructions. It was necessary to create the related document 101 of each signal and create the ladder program 102 based on the document.

[0003]

However, in the above method, when the input of the ladder program takes too long, or when the relation of each signal is changed, the document and the ladder program must be changed. Not
There is a problem in that the more complicated the relationship between the signals, the greater the possibility of programming errors. Therefore, it is an object of the present invention to reduce the time spent for inputting a ladder program as described above, facilitate the change processing of the ladder program, and improve maintainability.

[0004]

In order to solve the above problems, as shown in FIG. 2, when a ladder program 203 composed of a relay circuit instruction of a programmable controller is created, the relation of each signal is shown in a table format. The ladder program 203 is automatically generated by inputting the signal definition table 201 into the converter 202 (hereinafter referred to as tabular programming). In addition, the signal definition sub-table 204 is included in the signal definition table 201.
, And complex signals can be grouped so that they are simple and easy to see.

[0005]

By the above-mentioned tabular programming means, the creator 205 feels as if creating a document, and the signal definition table 20
1. The ladder program 203 is automatically generated only by inputting each signal information to the signal definition sub-table 204, so that the time for inputting the ladder program can be reduced. Also,
By using the signal definition sub-table 204 attached to the signal definition table, each signal information can be expressed hierarchically, so that the relation of each signal is simple and easy to see, and when the change occurs, the direct ladder program 203 Since it is not necessary to change, the process of changing the program is facilitated and maintainability is improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an example shown in the drawings. FIG. 3 is an example in which an interlock program for output of mechanical equipment is created by tabular programming in the present invention. The procedure for creating the signal definition table 301 will be described below. In the register number setting column 304, the read destination register number (R
1 to R6) are set. Set the register number up to the bit level. In the register number setting column 304, the output signal storage area
Set the register number (R7). Signal symbol setting column 305, signal name setting column 306
Then, the symbol and name unique to each signal are set. The symbol is used as a label when converting to a ladder program, and the name is a comment of each signal. The type of signal is set in the i / o type setting column 307. I: Input signal O: Output signal-: Using output signal as a contact Set the relationship between each input signal and output signal in columns. ◯: A contact relay (input signal) X: B contact relay (input signal) ●: Coil (output signal) The signal definition table 301 is created by the above procedure. The signal definition table 301 is equivalent to the following logical expression (Expression 1). In addition, when converted to a ladder program, Fig. 4
become.

[0007]

[Equation 1]

After the signal definition table 301 is created, the signal definition sub-tables 302 and 303 are created in the same procedure. The signal definition sub-table 302 defines signal information related to the input signal S1, and the signal definition sub-table 303 defines the input signal S.
6 defines the signal information regarding 6. Also, when it is desired to execute a plurality of output signal controls by one ladder program, it is possible to create a plurality of signal definition tables like the signal definition table 308 and the signal definition table 309 and perform paging. The signal definition table (30
1, 302, 303, 308, 309) to the converter 202 of FIG. The processing procedure of the converter 202 is shown below. : Signal definition sub-table-1 (302) is converted into a logical expression (expression 2).

[0009]

[Equation 2]

When equation 2 is converted into a ladder program, FIG.
No. 501, but this is a redundant type (the number of steps increases). : (Equation 2) is optimized to obtain (Equation 3).

[0011]

[Equation 3]

Therefore

[0013]

[Equation 4]

Converting (Equation 3) into a ladder program results in 502 in FIG. : Signal definition sub-table-2 (303), signal definition table (301), signal definition table (308), signal definition table (30)
9) ... Is repeated in the order, the following logical expressions (Equation 4 and Equation 5) are obtained. (1) Signal definition sub-table-2 (303)

[0015]

[Equation 5]

(2) Signal definition table (301)

[0017]

[Equation 6]

(Converted in the order of pages of the created signal definition table): When the logical expressions (Equation 3, Equation 4, Equation 5, ...) Obtained by the above processing are made into one ladder program, FIG.
Becomes As described above, by inputting the data of the tabular programming shown in FIG. 3 into the converter 202 as shown in FIG. 2, the optimized ladder program 601 as shown in FIG. 6 is automatically generated. When the information of each signal is changed, the setting of the signal definition table of FIG. 3 is changed and input to the converter 202, and the ladder program with the changed signal information is generated.

[0019]

As described above, according to the present invention, the program input time of the ladder program constituted by the relay circuit instructions of the programmable controller can be reduced, the ladder program change processing can be facilitated, and the maintainability is improved. To do.

[Brief description of drawings]

FIG. 1 is a diagram showing a method for creating a ladder program including a conventional programmable controller relay circuit instruction.

FIG. 2 is a diagram showing a procedure for automatically generating a ladder program including relay circuit instructions of a programmable controller according to the present invention.

FIG. 3 is a diagram showing an example of tabular programming.

FIG. 4 is a diagram showing a ladder program (redundant type) equivalent to the “signal definition table 301 of FIG. 3”.

FIG. 5 is a diagram showing a ladder program (redundant type and optimum type) equivalent to the “signal definition sub-table 302 of FIG. 3”.

FIG. 6 is a diagram showing a ladder program automatically generated by the present invention.

Claims (2)

[Claims] 1. A programming device for a programmable controller composed of a ladder program, which is a table defining which ON / OFF of a coil depends on opening / closing of a relay, and a case in which the coil is ON,
Signal definition table creating means for creating a signal definition table for displaying each relay and each case in a matrix form in a vertical and horizontal direction, means for converting the signal definition table into a logical expression, and redundancy of the converted logical expression And a means for generating an optimized ladder program except for the above. 2. The programming device for a programmable controller according to claim 1, wherein a plurality of signal definition tables are hierarchically structured so that the coils of the signal definition table relate to energization of other relays. .