JPH0410085B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a sequence display device that automatically displays a sequence program of a sequence control device on a screen as a sequence figure consisting of logic symbols and connections, and particularly relates to a sequence display device that automatically displays a sequence program of a sequence control device on a screen as a sequence figure consisting of logic symbols and connections.
The present invention relates to a sequence display device that facilitates screen search when multiple CRT screens are used. As a conventional sequence control device, there is a display device using relay symbols. This CRT display using relay symbols is suitable when the sequence is relatively simple. Recently, sequences in sequence control devices have become more and more complex as control becomes highly automated, and it has become difficult to express sequences using conventional relay symbols. Therefore,
It has become common to express sequences using logic symbols such as AND and OR. In this case, changing the conventional relay symbol display to a logic symbol display requires conversion between them, which is extremely inconvenient. Additionally, as sequences become more complex, sequence programs become larger, often reaching nearly 100 A3-sized handwritten sequence drawings, and when these are to be displayed on screen, they must be divided and displayed on multiple screens. is required. The present invention relates to a sequence display device that eliminates the limitations of the prior art described above and automatically displays a program for sequence control stored in a memory as a sequence figure consisting of logic symbols and connections on a CRT screen. The purpose of this is to divide the program storage area into a predetermined capacity, such as a handwritten drawing or the number of words equivalent to the display screen, when displaying sequence figures spans multiple screens. To provide an easy-to-search display device that divides and stores a program while maintaining logical operation units, and when displaying the program, reads the program in divided storage area units, converts it into sequence figures, and displays them on the screen. be. First, a display device, which is the basis of the configuration of the present invention, will be explained in detail. FIG. 1 shows an example of a logic sequence. This sequence operates the negation of three inputs X001 and X002 and the AND of X003, and stores the result in temporary storage memory M001. Similarly, OR the M001 and input X114
is stored in M002, and input M002 and input X005, X006.
This is a sequence that outputs AND to Y001. FIG. 2 shows the configuration of a sequence control device that executes the above-described sequence and a sequence display device that displays the sequence of FIG. 1 using logic symbols. First, how the sequence control device 3 performs the sequence shown in FIG. 1 will be explained with reference to FIGS. 3A and 3B. Input to sequence control device 3 X001, ~X006
is taken into the input circuit 31. This input signal is
It is calculated by the control circuit 34 according to the sequence program stored in the main memory 33, and the result is sent to the accumulator (ACC) which is a refresh memory.
35 is temporarily stored. The contents of this ACC 35 can be output to the internal temporary storage memory 36 and stored.
It is output to output relay Y001 via output circuit 32. By the way, the sequence program stored in the main memory 33 of FIG. 2 is composed of instruction codes and addresses as shown in FIG. 3A. First, input X001 in program No. is taken in with the instruction code “S”, and the sequence control device 3
Set to ACC35. Next, program no.
Then, the control circuit 34 performs a logical AND operation on the value of ACC35 and the negative value obtained by inputting X002 using the instruction code "/", and the result is sent to ACC3.
Set to 5. In the program No., the above
A logical operation is performed on the contents of ACC35 and the input X003 using the instruction code "*", and the result is set in ACC35. In the next program No., ACC3
Temporarily store the contents of 5 in memory 3 using the instruction code “="
6 address M001. The following program retrieves the contents of address M001 of the temporary memory 36 using the instruction code "S",
Set to ACC35. Next, the value of the ACC 35 and the value taken in the input X004 are logically operated using the instruction code "+", and the result of this operation is then set at the address M002 of the temporary storage memory 36. Similarly, sequence control is performed in accordance with the program shown in FIG. 3A, but this program is shown in hardware as a normal sequence control device as shown in FIG. 3B. These programs are cyclically arithmetic processed in the sequence control device to which the present invention is applied, thereby performing sequence control. Here, the main instruction codes of the example program explained in FIG. 3 are shown in a table as follows.

[Table] The sequence shown in FIG. 1, which is subjected to the sequence calculation process as described above, can be displayed as logic symbols on the CRT 1 shown in FIG. 2 as follows. The buffer memory 24 of the sequence display device 2 of the present invention is the main memory 33 of the sequence control device 3.
It is used for temporary storage when creating a program as shown in FIG. 3A or when displaying a screen. The control circuit 25 is the sequence control device 3
In cooperation with the control circuit 34, it controls the transfer of the program from the main memory 33 to the buffer memory 24, the creation of a program from the keyboard, the storage of the program in the main memory 33 at the time of modification, etc. The control circuit 25 also includes a keyboard 2 including mode keys to be operated when creating and displaying sequences.
7. CRT control circuit 2 for displaying screen on CRT
1. A ROM 26 that stores a conversion program for converting the program stored in the buffer memory 24 into a program corresponding to logic symbols and their input/output; and a refresh memory 2 that stores a program converted for displaying logic symbols.
2, and a symbol generator 23 for displaying logic symbols on a CRT. Next, regarding the procedure for displaying the program shown in FIG. 3A stored in the main memory 33 on the CRT,
This will be explained using FIG. When the "circuit read" key 121 provided on the keyboard 27 shown in FIG.
The program stored in the main memory 33 is loaded into the buffer memory 24 of the sequence display device 2 via the main memory 33. The program imported here is the ROM
According to the conversion program stored in 26, the instruction code of the program is first decoded and the "=" instruction code is extracted. Next, the "S" instruction before the "=" instruction is extracted. Next, the number of steps from the "S" instruction to the "=" instruction and the instruction code are decoded to determine the number of input points, symbols, and addresses. This situation will be explained with reference to FIGS. 3A and 3B. The first "=" instruction is extracted. Next, the "S" command is located at , and the number of steps from "S" to the "=" command is three, so it can be seen that the number of input points is three. Next, since the "/" in the instruction code is the AND of ACC and the negation of the input, and the "*" is the AND of the ACC and the input, it can be seen that the symbol is AND. It can be seen that each address is input X001, X002, X003, and the AND output is M001. The symbol of one logic element has been determined above. Next, when the instructions are decoded again in the same procedure as described above, the "=" instruction is extracted and the "S" instruction is extracted. There are 2 steps and 2 inputs between the “S” and “=" commands, and the instruction code is “+”.
Since it is an OR of ACC and the input, it can be seen that it is a 2-input OR symbol, the input address is M001, X004, and the output address is M002. Next, in the same way,
3-input AND symbol, each input is M002, X005,
It turns out that X006 and the output address are Y001. Once the converted program for displaying logic symbols is determined as described above, these logic symbols will be displayed on the CRT. This logic symbol consists of three basic pixel areas, as shown in FIG. 5A. first
AND-M001 is a block (X=3, Y=1, 2,
3) Automatically placed in each input X001, X002, X003
and one logic operation unit are automatically connected. Then, OR
-M002 is automatically placed in the block (5-2, 3, 4) so that the first input of this OR is in a straight line with the output of M001, and each input M001, X004 and the next logical operation unit are automatically connected. Ru. Next, AND−Y001 is
The first input M002 will be automatically placed in a straight line with the output of M002, but if you do so,
Since the second inputs X005 and X006 are connection inputs, they are automatically placed in blocks (7-4, 5, 6) and automatically connected to each input. The details are shown in Figures 7, 8, and 9.
I will explain in detail. The basic idea is shown in FIG. 7. Steps 52, 53, and 54 in FIG. 7 are shown in detail in FIG. 8 A, B, and C, and steps 56, 57 in FIG. This is shown in detail in FIGS. 9A and 9B. As shown in 61, 63, and 65 in FIG. 8, logic symbols such as AND and OR are arranged using the second input signal line as a reference point when three inputs are standard. The points determined by this reference point are 62 and 6 in Figure 8.
4.66 logic symbol base points. This will be explained with reference to FIG. 5A. Taking the OR symbol of M002 as an example, this M002
OR is the result of OR of two inputs of M001 and X004 to Y001
This is the sequence to be output to. In the state before placing the M002OR symbol, as shown in FIG. 5B, the M001AND symbol is in the block (3-1,
2, 3) and is displayed on the CRT 1 in FIG. The first input M001 of M002 has already been placed at the position of block (4, 2) in FIG. 5, and the second input X004 is the signal that appears for the first time on the screen of CRT1.
4) is assigned to the input signal area. Since the position of the input signal has been determined, the base point of the M002OR symbol is determined to be block (5, 2) according to the principle shown in FIG. 8B. Next, in a certain space on the CRT1 screen in Figure 1 centered on this block symbol base point, AND,
Check whether logic symbols such as OR can be placed. The placement possible state here refers to a state in which a certain space on the CRT 1 to be placed is already unused by other logic symbols or wiring between logic symbols. If the logic symbol is placed, the automatic position determination of the logic symbol ends, but if the logic symbol is not placed, it is necessary to correct the logic symbol position in the order shown in Figure 9. . As shown in Figure 9, the correction method is based on the logic symbol base point in Figure 9.
Based on SP, lower right direction (X-ray (+)
The unused area on the screen of the CRT 1 is searched in a wave pattern in the Y-axis (-) direction). However, here, in order to facilitate automatic placement, the number of inputs for logic symbols such as AND and OR is limited to a maximum of three inputs. In the case of Figure 5 B and C (C is
After M002OR symbol placement, B is CRT1 before placement
This is the state of the screen. )M002OR Since the area (5-2, 3, 4) in which the symbol is to be placed is unused, it can be placed, and blocks (5-2, 3, 4) are placed as shown in FIG. 5C. Next, place the timer symbol T001 in Figure 5C and Figure 5D.
The case of creating the state of CRT1 as shown in is explained below. When you input M001, the area (5-2, 3, 4) where you want to place the T001 timer symbol is already
Since it is occupied by the M002OR symbol, it is necessary to correct the symbol placement position. So (5-
2) as the logic symbol base point SP and searching for an unused area on CRT1 using the priority order shown in Figure 9, we get (5-
Areas 5, 6, and 7) are selected. Once the arrangement of logic symbols has been determined, the signals are then connected. In the example of FIG. 5D, a state like that of FIG. 5E exists between FIG. 5C and D. Figure 5 E is
After determining the T001 timer symbol position, M001 and
T001 is the state before wiring. Since the highest priority is given to connecting signals in a straight line, a display as shown in FIG. 5D can be obtained. Next, based on the idea of placement priority and connection, and the idea that the input wiring is a straight line, the Y001 AND symbol whose inputs are X005, X006 and M002 is a block (as shown in Figure 5A). 7
-4, 5, 6). In this case, input
The connection between M002 and AND-Y001 is not a straight line and is automatically connected, but this situation will be explained using FIG. 6. First, as shown in FIG. 6, when two points are in the same line or in the same row and there is no obstacle between them, the two points are connected by a straight line. When the two points are not on the same level and there is no obstacle between the two points as shown in Figure 6 2, (1-1, 2-
1, 3-1, 4-1, 2, 3) with one bend. As shown in Figure 6, if two points are not in the same line and there is a problem in the shaded position (the block is occupied by another display), if the connection can be made in up to 3 turns, connect up to 3 turns. , automatically connect.
However, if the fault is in the diagonally shaded position as shown in Figure 6, for example, and there are three or more bends (in this case, four bends are required to connect the line), a letter indicating the connection between two points, such as A, is used. It only indicates that two points are connected, but does not connect them. This is effective in limiting the amount of processing time required to perform 100% connection. Details of automatic wiring will be specifically explained with reference to FIGS. 10 and 11. Figure 10 shows the idea of wiring with as few bends as possible, and Figure 11 shows A, B, C,
D is a specific example. Figure 11 A and B are the 10th
This is a specific example of steps 72 and 73 in the figure. Figure 11A
This method fixes the Y-axis of the route from the starting point SP to the ending point EP, moves the Y-axis from right to left as in ~, and searches for a route that can be connected. 11th
In contrast, Figure B shows a method in which the Y-axis is fixed for the route from the start point SP to the end point EP, and the X-axis is moved from bottom to top as in ~ to search for a connectable route. 1st
The methods shown in Figures 1A and 1B are one of the concrete examples, and which of Figures 11A and 1B should be given priority and the direction of the movement axis can be arbitrarily determined depending on the characteristics of the screen of the CRT 1. It is possible. Figure 11 C and D are the first
This is a specific example of step 74 in FIG. Figure 11C,
D creates a branch route based on the movement axes, . , in FIG. 11C are routes derived from the two-curve route in FIG. 11A. Furthermore, in order to reduce the number of trials for routes that can be routed, we focused on the fact that there are routes that are used overlappingly in multiple trial routes (3 in Figure 11 A and B, Figure 11 C and D). 4, 5, and 6), if the route that is used overlappingly has already been used, the route including that route is not attempted. The present invention provides a sequence display device that automatically displays the program of such a sequence control device on the screen as a sequence figure consisting of logic symbols and connections, and in the case where the program is large and displayed over multiple screens, The program is divided and stored in a plurality of storage areas divided in advance into predetermined capacities. If this predetermined capacity is, for example, the number of words equivalent to one handwritten drawing of a predetermined size, that is, in units of sheets, when displaying on the screen, the desired screen can be directly displayed by reading out this storage area unit. becomes possible. Furthermore, if the predetermined capacity is set to the number of words equivalent to one CRT screen, the screen and sheet unit (one drawing) will match, making drawing management easy and reliable. Conventional sequence search methods include a method of specifying an address in the main memory 33 and a method of specifying a code (for example, Y001) indicating an output. However, the former method has the disadvantage that it is necessary to be aware of the address in main memory where the sequence to be modified is located, which is cumbersome and easy to make mistakes.
There is a drawback that the sequence program stored in the main memory 33 must be rearranged many times when the sequence is modified. In the present invention, as an example is shown in FIG. 12, the arrangement of programs in the main memory 33 is divided into a predetermined storage capacity, in this example a set of programs equivalent to one screen, that is, divided into sheets; All have a word count of 32 words.
As described in detail in the method for automatically drawing a sequence screen, the sequence figure displayed on one screen has a minimum logic operation unit consisting of one logic symbol and its input/output lines, and has a plurality of them. For example, in the screen shown in FIG. 5A, there are 11 words consisting of three logical operation units as shown in FIG. 3A, and a considerable amount of unused memory is still left in one sheet. It is desirable to divide the program and arrange it so as to minimize the amount of unused memory, but since logical operation units must be stored in the same storage area without being divided, unused memory may occur. In addition, in a large-scale sequence program, BLOCK.1 to BLOCK.1 in Figure 12
As shown in BLOCK.3, the program is divided into several blocks according to their functions, each with its own space, so that rearrangements in memory due to program modifications do not affect other blocks. Next, a method of dividing the program arrangement in the main memory 33 into sheets by operating the keyboard 27 of FIG. 2 will be described. Details of an example of the keyboard shown in FIG. 2 are shown in FIG. 13. 104 is a hexadecimal numeric key, 105 and 111 to 130 are mode keys for the control circuit 25 of the sequence display device 2 to execute a predetermined function based on a program prepared in advance; for example, 105 is for creating a program or updating data. The key 121 for selecting processing such as settings reads the specified program as described above and displays it on the CRT.
This is a function key that displays the sequence screen. A method of dividing the main memory 33 in FIG. 2 into sheets using these keys will be described with reference to FIG. 14. First, press the sheet size change key 116. Next, the main memory 33 is divided into sheets. That is, 50 is entered by key 104,
Key in 5D0. Now the main memory 33
Block 1 is from address 100 to address 5D0,
The inside is divided into 50 sheets. Similarly, at 80
, press DD0, press 88, and press EF0. The main memory 33 now stores 30 sheets from 51st to 80th sheets, with addresses 5D0 to DD0 as block 2, and 8 sheets, from 81st to 88th sheets, from DD0 to FF0 as block 3.
Each is divided into sheets. Next, key in the data setting end key 105, and
Ends memory partitioning. In this way, the main memory that stores the sequence program is divided into sheets, and from then on, all sequences are created and modified on a sheet-by-sheet basis. That is, a program created within the number of words set for one sheet is sequentially stored in the storage area of each sheet by pressing the circuit write key 113. As a result, when the circuit readout key 121 and sheet number in FIG.
and displayed on the CRT. When the number of words on one sheet is equal to the number of words on one display screen, press the keyboard 27 while looking at the screen.
The program can be freely modified and added by operating the logic keys 101 and the like, and the modified sequence program is transferred from the buffer memory 24 to the main memory 33 by using the circuit write key 113. The initial value of the number of words for one sheet is 32 words, and thereafter the size of one sheet will be automatically increased or decreased in units of 16 words when creating or modifying a sequence. Relocation of the sequence program on the main memory 33 when modifying the sequence will be explained using FIGS. 15 and 16. FIG. 15 shows a case where the sheet size is not exceeded before correction due to sequence correction, 202 is the main memory of the sequence controller, A is before correction, B is after correction, and 211 is the sequence program used for sheet 10 before correction. , 212 indicates the unused memory of the sheet 10 before modification, 221 indicates the usage sequence program of the sheet 10 after the modification, and 222 indicates the unused memory of the sheet 10 after the modification. In this specific example, sheet 10
The used sequence program 211 had 22 words and the unused memory 212 had 10 words before the correction, but after the sequence correction for sheet 10, the number of words became 28 words. Since the increase in the number of words in the used sequence program due to sequence modification is 6 words, which is smaller than the number of unused words in the sheet, 10 words, only 32 words of the sequence program in the sheet 10 are rearranged on the main memory 33. FIG. 16 shows a case where the sheet size exceeds the sheet size before modification due to sequence modification, where A is before modification, B is after modification, 203 is the main memory of the sequence controller, 231 is a sequence program for use of sheet 11 before modification, 232 is the unused memory of sheet 11 before modification, 241 is the use sequence program of sheet 11 after modification, 2
42 indicates the unused memory of the sheet 11 after correction. In this specific example, sheet 11 has a sheet size of 32 words, and before modification, the sequence program used is 2.
31 is 30 words, and unused memory 232 is 2 words.
After making sequence corrections to sheet 11,
The number of words of the sequence program 241 used is now 40 words. Due to the sequence correction, the number of used sequence program words is 10 words, which is larger than the number of unused words in the sheet, which was 2 words, so the sheet size is automatically increased in units of 16 words to 48 words. Therefore, all sheets after sheet 11 are shifted down by 16 words and are subject to rearrangement. However, the sheet subject to this rearrangement is the 12th
This is only the sheet in block 1 of the figure. In this way, when a predetermined sheet unit is exceeded due to the addition of a sequence, etc., the capacity of the storage area is automatically increased or decreased in units of a specific number of words, so that the sequence can be corrected without being aware of the sheet unit. According to the present invention, even when the sequence figures of a large-scale sequence program span multiple screens on a CRT, the memory is divided in advance into predetermined storage capacity units such as one A3 handwritten drawing, etc. By reading data in units of divided storage areas, a desired screen can be directly displayed, which has the effect of making operations easier. Furthermore, by associating one screen with a drawing, drawings can be managed reliably.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a sequence by logical symbol display, FIG. 2 is a block diagram of an example of a display device to which the present invention is applied, FIG. 3 is an explanatory diagram of the sequence, and FIG. 4 is a diagram showing a sequence on a CRT. Flowchart explaining the idea of display, Figures 5 to 11 are diagrams explaining the idea of automatic drawing, Figure 12 is a diagram explaining sheet allocation of the main memory in the present invention, and Figure 13 is for sequence creation. FIG. 14 is a diagram showing an example of sheet registration to which the present invention is applied, FIG.
FIG. 6 is a diagram illustrating relocation of a sequence program on the main memory when modifying a sequence. 1...CRT, 2...Sequence display device, 2
1...CRT control circuit, 22...Refresh memory, 23...Symbol generator, 24...
Buffer memory, 25... Control circuit, 26...
ROM, 27...keyboard, 3...sequence control device, 31...input circuit, 32...output circuit, 33...main memory, 34...control circuit, 35
...accumulator, 36...temporary memory,
101...Logic symbol key such as AND, or, 1
02...JMP, RTN special command key, 103...
Signal name identification code key, 104...hexadecimal numeric key, 105...mode key, 106...cursor key, 111-130...mode key.

Claims (1)

[Scope of Claims] 1. A sequence display device that displays on a display device a sequence program that performs arithmetic processing for sequence control as a sequence figure made up of logical operation symbols and connections, wherein the sequence program indicates instructions for logical operation. When the code and the address of the input signal for the logical operation are taken as one logical operation unit, it is made up of multiple logical operation units, and these logical operation units are stored in multiple storage areas divided into predetermined storage capacity units. storage means for storing the sequence program dividedly so that a calculation unit is included in one storage area; and display control means for reading out the sequence program from the storage means in units of the divided storage area, converting it into the sequence figure and displaying it on a screen. A sequence display device comprising: and.