JPH0433003A - Method for preparing cross reference in sequence program - Google Patents

Abstract

PURPOSE:To reduce required memory capacity and time for processing by scanning a sequence program, preparing a cross reference information table by storing the description block numbers of coil elements corresponding to respective contact elements, and fitting a cross reference to all the elements after scanning the program again. CONSTITUTION:The sequence program is scanned, and a cross reference information table 32 is prepared by storing the description block numbers of the coil elements corresponding to the respective contact elements. Then, the block numbers of the coil elements stored in this table 32 are respectively attached to the correspondent contact elements. Afterwards, the sequence program is scanned again, and the description block numbers of all the contact elements are attached to the coil elements so as to fit the cross reference to all the contact elements and the coil elements. Thus, when preparing the cross reference, the memory with much capacity is not required and further, the time for the processing can be comparatively shortened. Then, the processing can be easily executed by a computer 10 at the level of a personal computer.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a sequence program in which, when a sequence program is displayed as a ladder diagram, cross-references are automatically attached to the constituent elements of the ladder diagram. Regarding how to create cross-references.

(Prior Art) Conventionally, relatively large machines used in production factories and the like have used sequencers to control their operations. This sequencer is a dedicated computer developed to control machines. When manually writing an operating program to a machine controlled by a sequencer, it is usually done while drawing a ladder diagram on a CRT. When creating an operating program manually, if the machine has a very simple operation, the amount of program that needs to be input, in other words, the number of contacts and coils used, is not very large, and the original If you have a ladder sequence diagram, you can respond to requests for program changes relatively easily. However, when it comes to programming a controller that controls the operation of one line of machinery in automobile production equipment, for example, the number of contacts and coils required is unimaginably large.
Even if there is a simple specification change, it becomes difficult to even search for the changed part.

Conventionally, in a program having a large number of steps, an index called a cross-reference has been attached in order to easily find the relevant part from the ladder diagram displayed on the CRT. This cross reference is a ladder diagram that allows you to quickly recognize in how many blocks there is a coil that drives a contact, or in how many blocks a contact operated by that coil exists. It is attached below the contacts and coils.

Conventionally, this cross reference is created as follows.

For example, a case where a loss reference as shown in the diagram is attached to each component of a ladder diagram as shown in FIG. 5 will be exemplified.

The first method includes a method as shown in FIG. In this method, the entire sequence program is checked each time the addresses of contacts and coils appear when creating a circuit.

First, the value of the counter n is set to 1, and a search for a block having the R1 coil is started (steps 1 and 2). When the corresponding coil is searched, the searched block number is written under the contact point of R1 (steps 3 and 4). next,
The value of the counter n is incremented by 1, and a block having a coil of R2 is searched. The above process 1- is performed until the search for all the coils in the block diagram is completed (step 5.6). For example, in the ladder diagram shown in Figure 5, all blocks are searched, and when relay R1 is found, the number of that block is determined. 1 to all contacts actuated by that coil. In the figure, since the coil R1 exists in the 1000th block, 1000 is added below the contact R1 in the 1st block which is operated by the coil. Also,
Since relay R2 is present in the second block, 2 is attached below the contact R2, which is operated by the coil and is present in the first block. Furthermore, since relay R4 is present in the 1st block, 1 is added below the contact point of R4, which is present in the 2nd block and the 1000th block. In this way, the corresponding coil is found by searching all the programs, and then the program is searched again and the block number where the coil exists is written under the contact driven by the fill. Through the above processing, the flock number in which the coil is present is assigned to all the contacts.

Next, the value of the counter n is set to 1, and a search for a block having a contact point of R1 is started (step 7.8).

When the corresponding contact is found, write the found flock number under the R1 coil. The above processing is performed until the search for all flocks is completed (steps 9 to 11).

Next, the value of counter n is incremented by 1t, and R
Search for flocks that have 2 contacts. The above processing is performed until the search for all contacts in the program is completed (step 12.13). When the above process is performed, in the ladder diagram of Fig. 5, the blocks are searched sequentially, and when the block in which the contact R1 is found is found, the number of that block is assigned to the coil that operates the contact. It is attached under R1. In the figure, since contact R1 is present in the first block, 1 is attached below the coil of R1 that operates the contact.

Also, since the contact R2 exists in one block, 2 is attached below the coil of R2 that operates the contact.

Furthermore, in the case of contact R4, 2 blocks and 1000
Since it exists in the block diagram, the order in which block numbers are assigned is 2 followed by 1000.

By performing such processing, cross-references are attached to all contact elements and coil elements included in the program.

Next, as a second method, there is a method as shown in FIG. In this method, cross-reference data for contacts and coils that appear even in the entire sequence is created in memory before the circuit is created.

First, it is determined whether the manual data in the sequence program is related to the coil (step 2
1). If the input data relates to a coil, a block number is stored in association with the input coil. For example, when inputting the sequence program shown in Fig. 5, if the R1 coil is input in the 1000th block, the coil reference table shows that the R1 coil exists in the 1000th block as shown in Fig. 8. Stored (step 22).

Next, if it is determined that the manually entered data is related to contacts rather than coils (step 23
), the block number is stored in correspondence with the input contact number. For example, as shown in FIG.
When the first block is entered manually, the presence of the contact R1 in the first block is stored in the contact reference table as shown in FIG. 8 (step 24). Such processing is continued until all inputs are completed, and the stored data is as shown in FIG. 8 (step 25). When printing a ladder sequence diagram, cross-references are written on the contacts and coils based on the data stored in the reference table shown in FIG. 8 (step 26).

(Problems to be Solved by the Invention) Is it possible to create cross-references according to the methods described above?The two conventional methods described above have the following drawbacks.

First, in the first example method, when creating a cross reference, it is necessary to search all sequence programs for the number of times contacts and coils appear, which requires a large amount of processing time. In addition, in the second example method, the sequence program search is only required once and the processing time is short, but on the other hand, the amount of data to be stored to create the cross-reference is enormous. The drawback is that it requires a large amount of memory capacity. Therefore, when creating cross-references using this conventional method, it is not practical on a personal computer level computer;
There is a problem in that such processing cannot be easily performed because a large-sized computer is required.

The present invention has been made in view of these conventional problems, and it is possible to create a loss reference as described in Section 2 without requiring a large amount of memory, and in addition, the time required for processing is relatively short. The purpose of this invention is to provide a method for creating cross-references in a microcomputer, which can be easily processed by a personal computer level computer.

(Means for Solving the Three Problems) In the present invention for coupling the objectives of the sequence progera 1, when the peaks and valleys of sequence progera 1 are expressed in a ladder diagram, in order to make the ladder diagram easier to read, a ladder diagram is used. In a method for creating a cross reference in a sequence program when attaching a cross reference to contact elements such as relay contacts, timer contacts, and counter contacts constituting a relay contact, and a coil element that drives these contact elements, the sequence program is scanned. The written block number of the coil element corresponding to each contact element is stored, the cross-reference information is set to f[, and the written block number of the coil element stored in the cross-reference information table is written to each corresponding contact element. Attached,
Scan the sequence program again, add the description block numbers of all contact elements corresponding to coil elements having the same description block number to the coil elements, and add cross references to all contact elements and coil elements. It is characterized by the following.

(Function) By creating a cross-reference using the method described above, a cross-reference information table can be created by scanning the sequence program only once, and the memory capacity for storing the cross-reference information table is large. does not require. If you want to attach cross-references to all contact elements and coil elements, simply scan the created cross-reference information table, extract the memory contents, and attach the memory contents under the corresponding contacts or coils. good. Therefore, cross-references can be created using commonly used computers.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic configuration diagram of an apparatus that executes a cross-reference creation method in a sequence program according to the present invention, and FIG. 2 is a flowchart showing a process for creating a cross-reference in the apparatus shown in FIG. 1. , Fig. 3 shows a cross-reference information table created when the flowchart shown in Fig. 2 is executed, and Fig. 4 shows a cross-reference for each contact and coil based on the cross-reference information table shown in Fig. 3. FIG.

An apparatus for carrying out the cross-reference creation method of the present invention has a configuration as shown in FIG.

The CPU10 that performs all calculations and controls in the device includes
Control program section 12. The memory unit 14 is connected to a monitor 16 and a printer 18, respectively. The control program section 12 is provided with a sequence circuit creation section 25 and a cross reference creation section 27. The memory unit 14 also includes a sequence data table 30 storing sequence data for creating a sequence circuit in the sequence circuit creation unit 25, and cross reference information for creating a cross reference in the cross reference creation unit 27. It has a cross-reference information table 32 that stores. The monitor 16 is a CRT display or a liquid crystal display, and displays the sequence circuit created by the sequence circuit creation section 25 as a ladder diagram. Further, the printer 18 displays a ladder diagram displayed on a monitor.

It is used when printing out programs and data stored in the control program section 12 and memory section 14.

The cross-reference information table is created as follows by executing the flowchart shown in FIG. 2 using the apparatus configured as described above.

First, the cross-reference creation unit 27 generates sequence data stored in the sequence data table 30,
That is, information is input (step 30), and it is determined whether the information is manually input or contact information (step 31).

If this manually generated information is contact information, set the contact flag to 1.
The contact point information and the contact point flag manually entered are stored in the memory unit 14 (steps 32 and 33). If it is determined in step 31 that the information is not manually input or contact information, it is determined whether the information is coil information or not (step 34). If this information is coil information, the contact information that operates in relation to this coil,
The coil flag and the block number in which the coil is written are stored in the memory unit 14, and at the same time, the number of appearances of the coil at the current time is also stored in the memory unit 14 (steps 35 and 36). Then, it is determined whether the above-mentioned processing has been performed on all the information stored in the sequence data table 30, and if the above-mentioned processing has not been performed on all the information, the above-mentioned processing has been performed on all the information. It is done about information. The cross reference information table created through such processing is stored in the memory unit 14 (step 37).

When the above processing is performed on a sequence program as shown in FIG. 5, for example, a reference information table as shown in FIG. 3 is created.

For example, in the above-described process, if the information is manually input or contact information of R1, first, it is stored in the memory unit 14 that the code of the contact is R1 and the contact flag is 1. If the next input information is the coil R1, the coil flag in the reference information table for the previously stored contact R1 will be set to 1, and the block number in which the coil R1 is written will be set to 1000. Furthermore, it is set that the number of appearances of coil R1 in the searches up to now is 1, and a new reference information table regarding R1 is created.

When the above processing is performed for each contact and each coil, a loss reference information table as shown in FIG. 2 will be obtained from the sequence program shown in FIG.

FIG. 4 is a flowchart showing a process for attaching cross-references to contacts and coils that are components of a sequence program based on the contents of the cross-reference information table created as described above.

The cross-reference creation unit 27 extracts information from the cross-reference information table 32, and determines whether the extracted information is contact information (steps 41 and 42). If the information is contact information, furthermore,
It is determined whether the number of occurrences of the coil related to the contact is once, and if it is once, the block number of the coil is written under the contact (steps 43 and 44).

If the number of occurrences of the coil is two or more, search all the sequence programs stored in the sequence data table 30 again, and write all the block numbers in which the coil is written under the contact ( Step 45). On the other hand, if the input information is not contact information, it is determined whether it is coil information, but if it is coil information, all sequence programs stored in the sequence data table 30 are searched again. , the block number in which the coil is written is written below the coil (steps 46 and 47). Once the above processing has been carried out for all contacts and coils, the processing ends (step 48).

A cross-reference is created as described above, but
When attaching a cross reference to a coil during the creation process, all sequence programs are scanned as in the past. However, in a sequence program, the ratio of the contact elements to the coil elements, which are its constituent elements, is usually considered to be about 10:1, so even if such processing is performed, the overall processing speed will be increased. It turns out. Further, the memory capacity required for creating the cross-reference f-report table is also very small.

(Effects of the Invention) As is clear from the above explanation, according to the present invention, when creating a cross reference, the required memory capacity is minimal, and the processing requires a large amount of time. It also disappears.

Therefore, cross-references can be created using a personal computer level computer with relatively low processing power and storage capacity.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an apparatus for executing the cross-reference creation method in a sequence program according to the present invention, and FIG. 2 shows a process for creating a cross-reference in the apparatus shown in FIG. 1. Flowchart, Figure 3 shows a cross-reference information table created when the flowchart in Figure 2 is executed, and Figure 4 shows cross-references for each contact and each point based on the cross-reference information table shown in Figure 3. FIG. 5 is a ladder sequence diagram illustrating an example of how to create a cross reference in the conventional method and the present invention. FIG. FIGS. 7 and 8 are flowcharts illustrating other conventional cross-reference creation methods and diagrams illustrating an example of table contents created by the process of the flowchart. DESCRIPTION OF SYMBOLS 10... CPU, 12... Control program section, 14... Memory section, 16... Monitor, 18...
...Printer.

Claims (1)

[Claims] When the contents of a sequence program are expressed in a ladder diagram, in order to make the ladder diagram easier to read, contact elements such as relay contacts, timer contacts, counter contacts, etc. that make up the ladder diagram, and their contact elements are In a method for creating a cross reference in a sequence program when attaching a cross reference to a coil element to be driven, the sequence program is scanned and the written block number of the coil element corresponding to each contact element is memorized to create cross reference information. Create a table, add the block numbers of the coil elements stored in the cross-reference information table to the corresponding contact elements, and scan the sequence program again to correspond to coil elements with the same block numbers. 1. A method for creating a cross-reference in a sequence program, characterized in that a description block number of all contact elements to be processed is attached to the coil element, and a cross-reference is attached to all contact elements and coil elements.