JP3456084B2 - Reference reference method in CAD system - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates, in particular, relates to a reference function for use addresses in CAD system for creating a ladder circuit diagram of the application program for a programmable controller (PC), CA
The present invention relates to a reference reference method in the D system .

[0002]

2. Description of the Related Art C of application program for PC
In the AD system, as shown in FIG. 8 , the program portion 93 of the application program 91 created by the designer is input to the CAD system 92 as a drawing, and the signal explanation portion 94 is input to the input program portion 93.
Further, after performing internal processing 95 such as conversion of machine code and development of cross reference (reference information), the ladder circuit output drawing 96 is output. In this case, reference information may be added to this output drawing. Further, it may be stored in a storage medium such as a floppy disk.

Here, the reference information indicates a location referred to as a contact for each output command by a circuit number (rung number) or the like, and the reference information facilitates the flow of the circuit. In the 5-digit address expression (xxxxY) in the ladder circuit, “xxxxxx” is a word address,
"Y" is a bit address.

[0004] Also, in the ladder circuit for outputting a plurality of reference for the same address number, it is conventionally displayed all manner, the referring rung numbers in Figure 9. That is, in FIG. 9 , the reference is originally only the rung 2 in 12A, but the rung 4 is also displayed. Further, in 12B, the reference is originally only the rung 4, but the rung 2 is also displayed.

[0005]

By the way, in the above-mentioned conventional structure, there is a case where there is no reference of the rung number output to the address on the contact side in the obtained ladder drawing. In this case, the circuit is traced. hard. Furthermore,
The method of displaying all the referenced rung numbers as shown in FIG. 10 has a problem that the relationship such as circuit connection is rather confusing.

[0006] The bit-to-bit in the conventional ladder drawings, which display only reference word pair the word, the word pair the word reference has a problem does not appear. That is, although the rungs 2, 3, and 4 are used as the reference in the case of FIG. 10 , the word-to-word reference is “none”.

An object of the present invention is to enable a CA to efficiently refer to a reference without the above problems.
It is to provide a reference reference method in the D system .

[0008]

SUMMARY OF THE INVENTION A first aspect of the present invention is to provide a ladder from a programmable application program.
In a CAD system that creates a circuit, the application
Run for each address number in the
Input (read command) and output (r
Section) is added. This gives the address
With the number as a key, the rung number that occurred is
Refers to the address numbers
Create a reference table that summarizes lens information.
From this reference table, refer to each address number
A ladder circuit is created by searching the lens information.

The second aspect of the invention is to create a reference table.
At this time, the word output instruction was expanded to bit output.
Later, add this to the reference table.

A third invention is to search reference information.
In addition, when it is an input command, it searches for the previous output command and outputs it again.
When it is a force command, it searches for the time until the next output command.
It makes sense.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The CAD system according to the first embodiment of the present invention will be described below in order to explain the embodiments of the present invention.
The reference reference method in the stem will be described. In this embodiment, the reference for each address number is
To create and retrieve information about the environment as follows. And this
1 to 3 show the flow of processing in the embodiment of
It was

First, the creation of reference information in the embodiment of the first aspect of the invention will be briefly described. When collecting the rung numbers used for each address number, an input and an output are added. As a result, for example, as shown in FIG.
A reference table having a configuration as shown in FIG. 4 can be created from the circuit of FIG . That is, using the address number as a key, the generated rung number is used as the instruction type (input: R,
Output: W), together with one another.

Next, the search for the reference information in the embodiment of the first invention will be described in brief. If it finds itself from the reference table created above, and if this is an input command, it outputs the immediately preceding output command. Is searched for, and in the case of an output command, all the rungs up to the next output command are searched.
An example of processing in the case of an input instruction is shown in FIG. 5 , and an example of processing in the case of an output instruction is shown in FIG .

The flow chart of FIG. 1 shows a specific flow chart for creating the reference table serving as the above reference information, and FIG. 2 further illustrates the flow chart for creating a ladder diagram based on the above reference information . 3 shows a flowchart for searching reference information from a ladder diagram. Note that FIG. 7 shows an example of a ladder diagram which is an output screen.

Referring to FIG . 1, at step S21, one rung is read first, and then at step S22, the end is determined. In the case of end (Y), the process ends, and in the case of not end (N), machine code conversion is performed in process S23, and then one command is read in process S24, and then in process S25. Whether or not it has ended is determined.

When the process S24 ends (Y), the process returns to the process S21, and when the process S24 does not end (N), the process S2.
In 6, the instruction type is calculated, that is, it is determined whether the instruction is a read instruction or a write instruction. After that, in step S27, the address number is calculated, and then in step S28, it is added to the reference table. As the format of the reference table, for example, there is a format in which instruction types, rung numbers, and the like are arranged in correspondence with the address numbers as keys. Next, in process S29, it is determined whether or not the address is a word command. If it is not a word command (N), the process returns to S24. In the case of a word instruction (Y),
After expanding the word instruction into a bit address (process S3
0), processing S3 of adding this to the reference table
1 is performed.

Next, with reference to FIG. 2, illustrating the ladder diagram create flowchart. In the process S41, one rung is read first, and then the end of the process is determined in the process S42. If it is the end (Y), the process is ended, and if it is not the end (N), the machine code is converted in the process S43, and then one instruction is read in the process S44, and then in the process S45, Whether or not it has ended is determined.

If the process ends in step S44 (Y), a ladder diagram is drawn, and then the process returns to step S41. If not completed (N), in step S46, the instruction type is calculated, that is, it is determined whether the instruction is a read instruction or a write instruction. Thereafter, in step S47, the address number is calculated, and then in step S48, the reference table is searched. Note that the reference table is searched, for example, by the procedure shown in FIG . Next, process S
After the signal explanation is added in 49, processing S50
In, after the ladder diagram is generated, the process returns to the process 44.

Further, referring to FIG. 3 , the flow of reference information retrieval will be described. First, in process S51,
The reference table is searched and the position n1 of the own table is obtained. This position is where the address number, instruction type, and rung number match.

Next, in step S52, the instruction type is determined, and if it is a WRITE instruction, step S5 is performed.
3 or processing S5 in the case of a read (READ) instruction
Go to 7 respectively.

In step S53, the next output instruction rung is obtained. That is, the next type = write position is obtained from the above matching position. This table position is n2. If the next type = write position does not exist, the table is searched from the beginning to itself. Next, in step S54, the presence or absence of data is determined. If there is (Y), in step S55 the rung number between n1 and n2 becomes reference information, and the process ends. If not (N), in process S56, it is determined that there is no reference, that is, only write, and the process ends.

On the other hand, in step S57, the immediately preceding output instruction rung is obtained. That is, the position is reversed from the matching position, and the position of type = light is obtained. This table position is n
Set to 2. If the next type = write position does not exist, the process is reversed from the final table position to the self position. Next, in process S58, the presence or absence of data is determined, and if there is (Y), in process S59, the rung number of n2 becomes reference information, and the process ends. If not (N), it is determined in the process 60 that there is no reference, that is, only read, and the process ends.

[0023]

As described above, according to the CAD system of the present invention.
According to the reference reference method in the above, since the reference on the contact side can be efficiently referred to by searching the reference table, it is referred only when the reference in the circuit outputting multiple times to the same address directly acts. be able to. Further, by expanding the word output instruction to bit output and adding it to the reference table, it is possible to refer to it as a reference even when the word output location is read in bits.

[Brief description of drawings]

FIG. 1 shows an embodiment of a reference reference method of the present invention.
Flowchart of reference table creation procedure .

FIG. 2 shows an embodiment of a reference reference method of the present invention .
Create a ladder diagram based on reference information
Flow chart of the procedure.

FIG. 3 shows an embodiment of a reference reference method according to the present invention .
Procedure for searching reference information from the ladder diagram
Row chart.

FIG. 4 is an explanatory diagram of an example of a reference table.

FIG. 5 is an explanatory view of a main part of a process of searching reference information .
Fig.

FIG. 6 is an explanatory view of a main part of a reference information search process.
Fig.

FIG. 7 is an explanatory diagram of an example of a ladder diagram using an output screen .

FIG. 8 is an explanatory diagram of an example of a PC application program .

FIG. 9 is an explanatory diagram of an example of a ladder circuit .

FIG. 10 is an explanatory diagram of another example of a ladder circuit .

[Explanation of Codes ] S21 to S31, S41 to S50, S51 to S60 ... Processing

Claims (3)

(57) [Claims] 1. A CAD system for creating a ladder circuit from a programmable application program, wherein reference information corresponding to an address number is obtained by sequentially collecting rung numbers used for each address number in the application program together with instruction types of the input and output. A reference reference method in a CAD system, characterized in that a ladder circuit is created by creating a reference table summarizing the above, and searching reference information for each address number from the reference table. 2. When creating the reference table,
2. The reference reference method in a CAD system according to claim 1, wherein the word output instruction is expanded to a bit output and added to a reference table. 3. When retrieving the reference information,
3. The reference referencing method in a CAD system according to claim 1 , wherein when the input command is an output command, the immediately preceding output command is searched for, and when the output command is an output command, a period until the next output command is searched.