JPS6041103A - Sequence control device - Google Patents

Abstract

PURPOSE:To simplify the preparation of a program and to minimize a program miss by analyzing a sequence pattern inputted by the user graphically and preparing a sequence control program on the basis of the analyzed result. CONSTITUTION:While moving a cursor on a CRT display device 8, respective marks and characters are successively inputted by operating a keyboard 6 to form a relay sequence on a display screen. The respective marks and characters on the display screen are stored in previously fixed areas of an RAM5 as codes in accordance with the display on the display screen. When the user inputs a program preparation command from the keyboard 6 at the preparation of the whole sequences on the display screen, a CPU3 receives the command, analyzes the sequence pattern in the RAM5 and prepares a sequence control program in the RAM5 on the basis of the analyzed result. The prepared sequence control program is stored in a floppy disc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sequence control device used in the management of production equipment in factories, the management of utility equipment such as electricity and steam, the management of distribution systems, and various other fields.

Sequence control II allows users to freely create sequence control programs, and is widely used in fields such as the management of production equipment in factories. By the way, in conventional sequence control devices, when a user inputs a sequence control program to the device, 0
The process of creating a relay sequence or logic sequence on paper, ■ The process of converting the created sequence into a step sequence (instruction sequence) that can be input to a sequence control device, ■ The process of converting the above step sequence into a sequence of steps provided on the panel of the device. Three steps are required, including inputting information into the device by operating switches, which requires a lot of effort to create and input the program, and also requires the steps ① and ② above. As a result, there is a problem in that errors are likely to occur in the input program.

Therefore, the present invention is capable of inputting a sequence control program into a device without performing the steps ① and ② above. Therefore, it is possible to extremely easily create and input a program, and the sequence control program hardly causes any mistakes in the program. The control device includes an input means for a user to input a sequence diagram, a display device for displaying the sequence diagram, and a graphical analysis of the sequence diagram input by the user, and based on the analysis result. The present invention is characterized in that it includes means for creating a sequence control program.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a sequence control device according to the present invention. In this figure, reference numeral 1 is a first unit for creating a sequence control program, and reference numeral 2 is a second unit for driving and controlling a controlled object based on the control program created by the first unit. Each unit is configured to be separable from each other.

In the first unit 1, 3 is a CPU (central processing unit), 4 is a ROM (read only memory) in which programs used in the CPU 3 are stored, and 5 is an R
AM (random access memory). Reference numeral 6 denotes a keyboard, through which letters, numbers, and symbols shown in FIG. 2, for example, can be input. 7
is an FDD (floppy disk drive), and the created sequence control program is stored on the floppy disk within this FDD. 8 is a CRT (cathode ray tube) display device.

Next, in the second unit 2, 11tiCPU.

12 is a ROM, and this ROM 12 contains a program for checking each part of the device when the power is turned on, a debugging program, a program for error processing, a program for data transmission with the unit 1, and an operator. Ingsistes (O8) etc. are stored in advance. 13 is RAM that has been battery banked up.
The sequence control program in the FDD 7 is transferred to this RAM 13. This RAM 13 is also used as a storage area for data processing. 14
is an input circuit configured with a photocoupler, and outputs the signal supplied from the controlled object to the input terminals □ to E to the pass line 15.

16 is a setting switch for setting the program mode, and the output of this setting switch is encoded and sent to the pass line 15.
This is a program mode setting circuit consisting of a circuit that outputs to. Reference numeral 17 denotes an interlock circuit, which detects an abnormality signal output from the CPU 11 when some abnormality occurs, and outputs a control signal to turn off the power. 18
is ACIA (Asynchronous Communication Interface Adapter) for serial data transmission, 1
9 is a PIA (parallel interface adapter) for parallel data transmission. Reference numeral 20 denotes an output circuit, which includes a decoder for decoding data supplied from l+ and CPUtx via the path line 15, and a relay or transistor (open collector) driven by the output of this decoder. The contact or collector terminal of the transistor is the output terminal Q1~Qrrl
It is connected to the. And these output terminals Q1~
Qnn are each connected to each part of the controlled object.

In the above configuration, the CPU II transfers the sequence control program stored in the RAM 13 to the O
Repeatedly run under the control of 8. During this execution process, control data is sequentially output to the output circuit 20, thereby driving and controlling the controlled object.

Note that the second unit 2 mentioned above is not connected to the first unit when in use.
It is used separately from unit 1. In this case, it may be used in Luo-Goku, or a plurality of units 2.2... may be connected to one central computer CC as shown in Figure 3, and each unit 2.2... central computer cc
It may be operated under the control of It is also of course possible to use the first unit 1 shown in FIG. 1 as the central computer CC.

Next, the process of creating a sequence control program by the first unit 1 will be explained.

First, the creator (user) operates the keyboard 6 and
While moving the cursor on the display screen of the CRT display device 8, the symbols and characters shown in FIG. 2 are input in sequence, thereby creating a register on the display screen as shown in FIG. 4, for example. Here, symbol A in FIG.
is the A contact of the relay, symbol B is the B contact of the relay, and symbol C is the "output symbol". Also, [110J, “115
” is the contact number of the external relay (relay inside the controlled body), and this number is determined based on the terminal number of the input terminal to which the contact is connected, □. Also, l'-Ml
1, 1rM12J, and rMO8J are internal relay contact numbers. The internal relay is a virtual relay, and in reality, a predetermined area in the RAM 1a of the second unit 2 is used as the internal relay area. r31J.

1'-306J is the number of the output symbol, and this number corresponds to the internal relay number or the terminal number of the output terminals Q0 to Qrn.

Also, when the creator creates the relay sequence shown in Figure 4 on the display screen, RAtV! In a predetermined display area 5a (see FIG. 5) in I5, each symbol and character on the display screen is stored by means of a code corresponding to the display on the display screen.

Note that the creator can create the above-described sequence on the display screen from any location and in any order, and can also delete the displayed symbol and change it to another symbol. In other words, sequences that were conventionally created on paper can be created directly on the display screen.

Next, when the creator has created the entire sequence on the display screen, he inputs a program creation command using the keyboard 6. The CPU 3 receives this command and creates a sequence control program based on the program in the ROM 4.

This creation process will be explained in detail below.

First, the CPU 3 uses the display area 5a of the RAM 5 (
Check the contents of each area in sequence from the top left in Fig. 5). In the example of FIG. 5, when a "vertical line" is first detected in area E0, CPU 3 next detects area E□
Check the contents of area E2 below. in this case,
A "right branch" is detected. Here, CPU 3 is RA
Search table 5b (sixth
The symbol detected in the previous check (vertical line), the symbol detected in the current check (right branch), and the check direction "down" are each written in the slot (2) of the figure by code. Next, the CPU 3 checks the contents of area E3 to the right of area E2 since the contents of area E2 are "right branch". In this case, A contact 1
10 is detected. Here, the CPU 3 stores the previous check result "right branch" in the #2 slot of the search table 5b.
Write down the current check result "A contact", the check direction "right", and the number "110" of the A contact. Next, the CPU
3 checks the area E4 to the right of the area E3, and performs writing in the ■th slot of the table 5b in the same manner as in the case described above. Next, the CPU 3 checks the contents of the area E5 below the area E4 since the contents of the area E4 is "lower branch", and performs writing in the ■th slot of the table 5b. Next, since the content of the area E5 is "right turn", the CPU 3 performs a right direction check and also writes in the table 5b.

However, this check is a check (temporary check) that is valid only when the power line G2 shown in Figure 4 is finally reached, and as shown in ■' and ■' in Figure 6,
"Right a" is written as the check direction. In this example, the signal does not reach the power supply line G2, and both ■' and ■' are erased. Next, the CPU
3, return to area E4 again and check from area E4 to the right (sat ① in Figure 6,
(See section ① a). Then, when a "downward branch" is detected by checking area E, the next check is performed in the downward direction (first slot). Next, if a "left turn" is detected by checking area E7, a temporary check to the left is performed (see ■', ■'), and if a dead end (contents of area E5) is detected, , the content of the temporary check is deleted from table 5b, and from now on that area E
Perform a right direction check from 5 (Slots ■ and ■). Therefore, the table 5b written by the above-mentioned process
The contents of slots #1 to #2 are A contacts Mll and M
12 constitutes an OR circuit (parallel circuit). Therefore, the CPU 3 writes the slot names ◯, ◯ and the contact number into the OR table 5c (FIG. 7) that is preset in the RAM S. Next, the CPU 3 returns to area E again and checks from this area E to the right (No. [stock], ■ slot). In this way, the search table 5b corresponding to the sequence created on the display screen by the creator is created.

Next, the CPU 3 creates a sequence control program in the RAM 5 based on the contents of the created search table 5b. That is, the CPU 3 first determines whether the relay contact 110 is connected to the power line G, (the fourth
(see figure), and then, based on the contents of slot ① and the contents of OR table 5c, relay contact 110 and the OR circuit of relay contacts Mll and M12 are connected in series (AND). detects that it is connected.

Next, based on the contents of the OR table 5c and the contents of the Oth slot, it is detected that the OR circuit of the relay contacts Mll and M12 and the output symbol 313 are connected, and the Based on the content of , it is detected that the other output symbol is connected to the power supply line G2.

Next, the CPU a creates a sequence control program in the RAM S based on the above-mentioned detection results. In the case of the above example, the following program is created.

L110: Store the contents of the specified relay in the A register in CPUa.

LSMll: Transfers the contents of the A register to the S register in CPU a, and stores the contents of the specified relay in the A register.

OM12. Store the logical sum of the specified relay contents and A register in A register - AS: Logical fit of A register and S register - A
Store in register.

8 313: Outputs the contents of the A register to the specified relay or output terminal.

Next, the CPU 3 stores the sequence control program created in the RAM 5 on a floppy disk in the FDD.

The above is the process of creating a sequence control program. In this embodiment, it is possible to create not only the logic sequences described above but also logic sequences using AND circuits, OR circuits, etc. on the display screen of the CRT display device 8. In this case, CPU 3
a Convert the logic sequence on the display screen into a sequence control program using the same process as described above.

As explained above, according to the present invention, there is provided an input means for a user to input a sequence diagram, a display device for displaying the sequence diagram, and a graphical analysis of the sequence diagram input by the user, and a result of the analysis. Since we have provided a means to create a sequence control program based on
As a result, when a user inputs a sequence control program to the device, there is no need for the process of converting the sequence into a step sequence, and the process of inputting the step sequence to the device by operating switches provided on the panel surface. This has the advantage that program creation and input can be performed extremely easily, and programming errors can be minimized. Furthermore, according to the present invention, a sequence can be created directly on the display screen, and therefore the sequence can be drawn more easily than when the sequence is created on paper.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is a diagram showing an example of symbols input by the keyboard 6 in FIG. The figure is a circuit diagram showing an example of a relay sequence created on the display screen of the CRT display device 8 in FIG. 1. 5 to 7 are diagrams showing a display area 51L, a search table 5b, and an or table 5C in RAM S, respectively. 3...CPU, 4...ROM, 6...Keyboard, 8...-
...CRT display device. Figure 5 Figure 7 Figure 6

Claims (1)

[Claims] an input means for a user to input a sequence diagram; a display device for displaying the sequence diagram; and a means for graphically analyzing the sequence diagram input by the user and creating a sequence control program based on the analysis result. A sequence control device comprising: