JPS6365966B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sequence program matching method, and in particular, to a ladder circuit corresponding to a sequence program block that is determined to be inconsistent through comparison.
This article relates to a new collation method that allows display on a CRT.

There have been remarkable technological advances in the field of sequence controllers in recent years, and the main one is, for example, program loaders with CRTs. In this loader, a sequence program is created simply by drawing an expanded connection diagram of a relay sequence (hereinafter referred to as a ladder circuit diagram) on a CRT by pressing each symbol key corresponding to a circuit element.

To briefly explain such a CRT-equipped program loader, numeral 11 shown in FIG. 1 is a sequence controller, and 12 is the aforementioned CRT-equipped program loader. In this loader 12, 12A is a cathode ray tube display section (CRT), 12B is a control section for a cassette magnetic tape (CMT), and 12C is a key operation panel. 13 is a CRT-dedicated connection cable between controller 11 and loader 12; 14 is
This is a connection cable between the key operation panel 12C and the CRT.

The controller 11 is equipped with two mode selection switches called RUN and TEST.
When the TEST mode is selected, the controller 11 is separated from the I/O element attached to the mechanical device that is the external control target.

In addition, in the RUN mode, the controller 11 is connected to the I/O element.

To summarize the functions shown in Fig. 2: 1. The operator can directly create a sequence program while looking at the relay ladder (conventional relay sequence circuit; expanded connection diagram).

2. Contents programmed from the keyboard on the direct key operation panel can be displayed on the CRT as a relay ladder.

3 Programs can be rewritten, added, or deleted directly from the keyboard while viewing the CRT.

4. The execution status of the sequence program in the RUN status of the controller 11 can be monitored.

5. Sequence programs keyed into the controller 11 and loader with CRT can be stored in the CMT and compared with the programs in the CMT.

Now, as shown in Fig. 2, the CRT-equipped loader 11
Six types of sequence program transfer patterns are possible.

Also, FIG. 10 shows that there is a function to compare the same programs loaded on the PC and CMT respectively.

FIG. 3 is a diagram showing the panel surface of the key operation panel 12C of the CRT-equipped loader 12 shown in FIG. 27
28 is a contact portion, 28 is a branch portion, 29 is an output portion, 30 is a relay portion, 31 is a numerical value portion, and 32 is a space portion.

Figure 4 shows the power supply installed on the key operation panel.
1 shown in Figure 2 shows the contents of the initial screen display displayed on the CRT screen in the ON state.
In order to select one of the 15 modes, the user is instructed to key in (NN) the number 01 to 15 next.

Figure 5 shows the format of the relay ladder circuit display for one sequence program block, and the maximum sequence displayed on the screen consists of 8 contacts and 1 output in the column direction and 11 rows in the row direction as shown in the figure, allowing you to create and modify the circuit. All positions can be specified with the cursor.

Figure 6 shows the sequence program (data) transfer procedure between CMT and PC.
An example of CMT data transfer will be explained.

When you key in 09CR on STR1, six types of transfer numbers will appear on the CRT screen as shown.
Now when you want to go from PC to CMT, that is, the first choice.
When you key in N=1 at STP2, START will be displayed on the CRT screen when the cassette tape (CMT) is in READY status, so at STP3
Press the START button. You will then be prompted to enter the program number on the CRT, so key in the 12-digit program number. Next, it instructs you to enter the creation date on the CRT, so 79-11-8
-I keyed in.

Next, at STP5, program data is transferred from the controller (PC) to the cassette (CMT), and tape rewinding, verification, and tape rewinding are performed to complete the transfer process. At this time, PC→CMT completion is displayed on the CRT for a certain period of time, and the system returns to the initial state.

One example of the transfer mode has been explained above in relation to the display contents on the CRT.In the verification process, which is the subject of the present invention, each block of the sequence program is compared, but in the conventional verification method, there are no discrepancies. When this occurs, numerical values in machine language are displayed on the CRT, or a list is printed as an error.If you do not know the organization and codes of command words for that model, you will be able to see the discrepancy. There were times when I was told that I didn't know where the problem was or what the discrepancy was, and I needed a list of programs on hand.

In the matching method according to the present invention, when a sequence program stored on the sequence controller side is compared with a corresponding sequence program on a device having a program storage function such as a magnetic cassette tape or a RAM, it is possible to detect mismatched program blocks. In some cases, the block is directly displayed as a circuit diagram using relay symbols.

Furthermore, to make this discrepancy more obvious to the operator, the discrepancy can be flashed, and a cursor or light pen can be used on the CRT.
Regarding the portion indicated above (one program block), a portion of the other program block to be compared is displayed on the CRT at the same time.

For this reason, in the method according to the present invention, when a discrepancy is checked at the machine language level in the collation process as in the past, a disk compile program (in this case, the relay symbol display is converted into machine language) is used to display one program block on the CRT. In order to run the conversion program (called a compiler), the verification program includes a disk compile program activation instruction. To provide a detailed explanation of this collation program, FIG. 7 is a flowchart showing the procedure for collating a series of sequence programs stored in the sequence controller PC and a series of sequence programs stored on the magnetic cassette tape CMT. It is shown.

In the figure, when a verification start is commanded, the first program block (corresponding to one circuit in a relay ladder) of the corresponding sequence program is read out from the CMT side at program step (hereinafter abbreviated as ST) ST1. Then ST
2, one corresponding program block is read from the PC side.

Next, in judgment ST3, one block each of PC and CMT read out in ST1 and ST2 is compared. If all one block is equal, the program moves to ST4 and issues a command to read the next program block (for example, on a CMT, the cassette tape is moved by one block, or on the PC side, an address is given to specify the address corresponding to the next one block). advance the value, etc.). Next, judgment ST5
Then, it is checked whether the series of sequence programs has ended or not. If YES, the verification is completed and a verification completion message is displayed on the CRT. NO.
If so, return to ST1. On the other hand, in judgment ST3
If NO, the process moves to ST6, where, for example, one program block (on the PC side) is compiled and displayed as a relay symbol on the CRT.

The way to display this is to flicker the error part. In addition, in ST7, when the cursor on the CRT is positioned at each component on the displayed ladder circuit, in this case, the component in the program block on the other side corresponding to the cursor position is moved to the CRT.
Display it in the lower right part of the screen.

Next, ST8 is a step for selecting various key inputs shown in FIG. 3, and if the START key of the control unit 21 shown in the figure is pressed, the process moves to ST4 described above. Also, the CR of the control section 33
When the key is pressed, the program moves to ST9 and commands to convert the display on the CRT screen. Also, when the cursor control key for scrolling and paging provided in the control unit 33 shown in FIG. 3 is pressed, ST1
0 and move the cursor position on the CRT up, down, left, and right, so you can move the cursor as appropriate to see not only the content displayed in the lower right part corresponding to the flicker area, but also any part of one block. can be judged visually.

FIG. 8 shows an example of display when unmatched program blocks are displayed on the CRT during verification.

In the figure, A is an example of a symbol display of one program block stored in the memory on the PC side, and B is an example of a symbol display of the corresponding program block stored in the memory on the CMT side. As shown in A and B of the figure, the address of the second a contact from the left in the first row is X0001 in A, but it is X0003 in B, which shows that they are different.

In the same figure (c), when the above (i.e., the program block on the PC side) is disk-compiled and displayed on the CRT screen, there is a mismatched element (a in the first row and second column).
(contact part) is made to flicker as shown in the figure.
Since the cursor position is at the a contact in the first row and first column, the element (a contact X0000) in the first row and first column on the CMT side is displayed in the lower right part of the screen.

Figure 2 shows a case where the cursor control key 〓 is pressed and the cursor is positioned at the flickering area in the 1st row, 2nd column. (See figure b)
Since X0003 is displayed, the operator can immediately understand the content of the discrepancy.

In the same figure, E is the same as D, and in the same figure, F is in the state of E.
When the CR key is pressed and the PC side
This indicates that the CMT side is converted and displayed.

As explained above, since the present invention uses a screen display method, the operator only needs to understand the relay sequence and can use the developed connection diagram (ladder circuit) as is, so there is no need for a program list, etc. The details become clear at a glance.

In the above explanation, a method for checking the mismatch between the sequence program stored on the PC side and that on the CMT side has been explained, but the cause of the mismatch between these two programs is not considered as an issue. Regarding this point, it should be pointed out that, for example, if a program stored on the PC side is once stored on the CMT and then combined with mechanical equipment, the PC program itself may be modified to make adjustments at the site. I hope that's understood.

[Brief explanation of drawings]

Figure 1 is an external view of the sequence controller and loader with CRT, Figure 2 is a block diagram explaining the 15 functions of the loader with CRT, Figure 3 is a diagram showing the key arrangement of the loader with CRT, Figure 4 is a diagram showing the modes that appear on the CRT screen when the power is turned on,
Fig. 5 is a diagram showing the display format of the relay ladder circuit on a CRT screen, Fig. 6 is a block diagram explaining the procedure for transferring the sequence program from PC to CMT, and Fig. 7 is the procedure of the collation method according to the present invention. A flowchart explaining the process, Figure 8 is a PC
FIG. 4 is a diagram showing the display contents when the mismatched parts are displayed on the CRT screen when the sequence program on the CMT side is compared with the sequence program on the CMT side. 11...Sequence controller, 12...CRT
Attached loader, 21, 22, 23, 33...control section, 24...program end section, 25...general purpose calculation section, 26...constant section, 27...contact section, 28...branch section, 29...output section, 30...relay section , 31...numerical part, 32...space part.

Claims (1)

[Claims] 1. Displays a sequence program one program block at a time on a CRT screen in response to commands from a key input section, and displays the program blocks one by one on a CRT screen.
A sequence program loader with a CRT that compiles and stores the sequence program in a memory device such as RAM or magnetic tape (CMT), and a sequence controller (PC) that stores the sequence program given by the program loader are used to store the sequence program in the memory device. The loader is equipped with a collation program for sequentially collating a series of sequence program blocks in the controller PC with corresponding program blocks in the controller PC, and in the collation process, program blocks having mismatched portions in the two programs are compared with each other. In such a case, the verification program is provided with a program step that commands to descompile the mismatched program block and display it on a CRT screen as a ladder circuit, and to flicker the corresponding circuit portion of the display section of the same block at the location of the mismatch. A sequence program matching method characterized by the following. 2. In the collation method as set forth in claim 1, a cursor whose position is specified by the key input section is moved on the display section on the CRT screen, and an image corresponding to the cursor position is displayed on the CRT screen. A sequence program verification method characterized in that the verification program includes a program step that instructs to simultaneously display the corresponding circuits of the other program block being compared on a part of a CRT screen.