JPS6211367B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a program modifying device for modifying a sequence program written in the memory of a sequence controller, and more particularly to a cathode ray display tube (hereinafter referred to as
This invention relates to a program modification device that performs program modification while viewing a ladder diagram displayed on a display screen such as CPT. In recent years, the sequence program stored in the memory of a sequence controller is converted into a ladder diagram in which relay contacts are connected consecutively and displayed on a CRT screen, and the circuit can be modified by looking at the diagram displayed on the CRT screen. A program correction device has been developed that allows for the deletion of a sequence program corresponding to a specified contact point by specifying a specified contact point on a diagram and performing an erase operation. After specifying a contact point, a new sequence program can be inserted by performing an operation for adding a contact point. However, in this method, the program input by key operation is simply inserted mechanically before the sequence program corresponding to the designated contact point, so as shown in Fig. 1, there are multiple contact points. It is very troublesome to add a contact in parallel to a plurality of contacts, such as adding a contact I5 in parallel across I2 and I3. That is, as in the above example, multiple contacts I2
When contact I5 is connected in parallel across I3 and I3, in the sequence program, contact I
In addition to adding a program to test contact I5 before the sequence program that tests contact I5, it is necessary to add the program that tests contact I5 before this test program and before the sequence program that corresponds to contact I2. Therefore, when adding contact I5 to a conventional device, it is necessary to specify contact I4 and add contact I5.
After inserting the sequence program for testing 5, it was necessary to insert the auxiliary command, change the contact designation from I4 to I2, and write the auxiliary command again. Furthermore, as is clear from the above explanation, in conventional equipment, not only must the operator judge where to add the test program and auxiliary commands in the continuous sequence program, but the operator must also If you specify which contact point on the diagram to add a program, you must know at which position in the sequence program the program will be added, and there is a drawback that only a specific operator can modify the program. Ta. In view of such conventional problems, the present invention automatically determines the connection mode of the additional contact by specifying the circuit section in which the newly added contact is connected in parallel by operating the shift key and the cursor leave key. Based on the results of this determination, additional contact test instructions and accompanying branch instructions can be automatically inserted into the necessary positions on the sequence program, making it easy and quick to modify the program. Embodiments thereof will be described below based on the drawings. In FIG. 2, 10 is a sequence controller consisting of a memory 11, an arithmetic processing section 12, an input section 13, and an output section 14. A sequence program for instructing sequence control is written in the memory 11 using the command words shown in Table 1. It's included.

[Table] Instruction words include test instructions (TNA to TFE), conditional output instructions (YON), unconditional output instructions (SON), branch instructions (JMY, JMN), etc. Among these, test instructions and output instructions An input/output address for selecting an input/output element such as a limit switch or relay is programmed into the operand part of the branch instruction, and a memory address to jump to is programmed into the operand part of the branch instruction. The arithmetic processing unit 12 operates on the input/output unit 13 based on the sequence program stored in the memory 11.
It executes sequence control by repeatedly testing the input/output elements connected to 14 and energizing and deenergizing the output elements based on the test results.When the interrupt signal INS is given from the outside, Stops sequence control and stores memory 1 in response to external commands.
The memory 11 has a function of outputting sequence program data stored in the memory 11 to the outside and writing sequence program data given from the outside into the memory 11. On the other hand, 20 is a program modification device that allows additional modification of the sequence program while viewing a ladder diagram displayed on a CRT screen. generator 25, video signal generation circuit 26,
It is composed of a CRT 27 and a display control circuit 28. As shown in FIG. 3, a large number of operation keys 30 to 41 are provided on the operation panel 21, and when the read key 30 is pressed, the arithmetic control circuit 22 causes the Steps (40) to (42) of the control routine are executed in order, an interrupt signal is sent to the sequence controller 10 to stop the sequence control, and then all of the sequence programs stored in the memory 11 are read out and stored in the buffer memory. It is stored in the program store area PSA provided in 23. Figure 5 shows buffer memory 2.
The program store area PSA is set according to the length of the sequence program stored in the memory 11 of the sequence controller 10. Thereafter, when the operator presses the search switch 32 after inputting the address of the output element of the circuit to be modified using the numeric keys 31, the arithmetic control circuit 22 operates based on the program shown in FIG. 4b. , searches for a sequence program related to the on/off of a specified output element, converts this into predetermined data, and writes it into the refresh memory 24, thereby displaying the searched sequence program. That is, the arithmetic control circuit 22 performs step (43).
In the program (45), the sequence programs stored in the program store area PSA are sequentially read and written to the display program area DPA in the buffer memory 23, and when it is detected that an output command has been written. , moves from step (45) to step (46), and determines whether the written output command is related to the output element specified by the numerical key 31 by referring to the data in the address field. do. If it is determined that the written output command is not related to the specified output element, the display program area DPA is cleared in step (47), and then the process returns to step (43) to output the written output. If it is determined that the command relates to the specified output element, the process moves from step (46) to step (48). As a result, when the process moves to step (48), a series of sequence programs related to turning on and off the specified output element is written in the display program area DPA. For example, if you want to display the sequence program for the circuit shown in FIG.
Press 2. As a result, a sequence program including an output command for relay 01 is searched from among the sequence programs stored in the program store area PSA, and this is the sequence program shown in FIG. 6b.
As shown in the figure, data is written in order from the first address R of the display program area DPS. Step (48) is the display program area DPS
This step converts the sequence program written in the program into predetermined display data according to the type of command and writes it into a predetermined storage area of the refresh memory 24. When the writing is completed, the process returns to the main routine (not shown). . The display data written in the refresh memory 24 is read out at regular intervals according to commands from the display control circuit 28, and is converted into predetermined symbol pattern data by the pattern generator 25, and is converted into predetermined symbol pattern data by the video signal generation circuit. 26. As a result, a ladder diagram with relay 01 as an output element is displayed on the display screen of the CRT, as shown in FIG. 7a. At this time, the cursor used when modifying the program is located below contact I1 at the left end of the CRT display screen.
COR is displayed. The program modification device of this embodiment can not only add sequence programs but also change and delete sequence programs by referring to the ladder diagram on the CRT screen, but changing and deleting sequence programs can be done using the same method as in conventional devices. Since this is done in , we will only discuss the addition of programs. When adding a program, there are cases in which contacts are added in series to the circuit, and cases in which contacts are added in parallel to the circuit. In the former case, operate the shift key 33 on the operation panel 21 to move the cursor under the contact after the point to which you want to add a contact, and then press the numeric keys to enter the input/output address of the new contact. 31 and enter
Depending on whether the contact is normally open, the contact key 38 or 39 is pressed, and the contact addition key 35 is pressed. On the other hand, when connecting the contacts in parallel to the circuit, after shifting the cursor to below the first (leftmost) contact in the circuit section where the contacts are connected in parallel, press the cursor leave key 34. Shift the cursor to the last contact in the circuit section, then use the numeric keys 31 to input the input/output address of the contacts to be connected in parallel, and press either contact key 40 or 41 depending on the type of contact. , Finally, press the contact addition key 35. For example, in the circuit of FIG. 6a, if you want to modify the circuit by connecting contact I5 in parallel across input elements I2, I3, and I4, press the shift key 33 once and move the cursor.
After moving COR below contact I2, press shift key 33 while pressing cursor leave key 31.
Press the button twice to shift the cursor to the bottom of contact I4, and then set the input/output address of I5 using the numeric key 3.
1 and press the contact key 40 and the contact addition key 35 one after another. If the cursor is shifted while the cursor leave key 34 is pressed, the cursor COR remains in the previous position, as shown in Figure 7a, and it is difficult to determine which part the contacts are connected in parallel. It is now possible to check. FIG. 8 shows an insertion position detection routine for detecting the insertion position of a program, which is executed when the shift key 33 is operated or when any of the contact keys 38 to 41 is operated. Said buffer memory 2
3, as shown in FIG.
A cursor position storage area CPA is provided with memory addresses S to S+n corresponding to . Then, the writing position of the program is detected. That is, when the shift key 33 is operated, the cursor leave key 3 is pressed in step (50) in FIG.
Determine whether 4 is pressed or not, and if it is pressed, in step (51) write 1 to the address specified by the write pointer that specifies the data write position in the cursor position storage area CPA. After that, step (52) increments the write pointer and returns to the main routine, pressing the cursor leave key 34.
If is not pressed, only the write pointer is incremented in step (52) and the process returns to the main routine. On the other hand, if any of the contact keys 38 to 41 is pressed, steps (51) and (52)
is executed, writing 1 to the specified address and incrementing the write pointer. Since the write pointer is set to point to address S before the cursor position shift operation is performed, there is a one-to-one correspondence between the cursor position on the screen and the area specified by the write pointer, and the above example If you command to add contact I5 with the cursor displayed below contacts I2 to I4, as in
As shown in FIG. 6c, 1 is written in the cursor position storage areas S+1 to S2+3. On the other hand, FIG. 9 shows a routine that inserts a command word into the sequence program transferred to the program store area PSA in accordance with the addition of a contact, in which the mode of addition of a contact is determined in step (60), and the mode of addition of a contact is determined in step (61). Insert the command word according to the contact addition mode in the display program area DPA, and then
In step (62), display data is written into the refresh memory 24 based on the sequence program into which the instruction words have been inserted. Then, in step (63), the inserted sequence program is placed in the program store area PSA, and if there is a branch instruction in the modified program, the address of the branch destination of this branch instruction is entered in step (64). When the writing is completed, the sequence program stored in the program store area PSA is transferred to the memory 11 of the sequence controller 10 in step (65), and the operation is completed.
As a result, the modified sequence program is stored in the memory 11 of the sequence controller 10, and the CRT display screen is displayed as shown in FIG.
The modified ladder diagram shown in is displayed. In this program modification routine, determination of the manner in which contacts are added and insertion of command words are performed in the routine shown in FIG. First, select whether to add contacts in series or in parallel to the circuit (70).
If it is determined that the program should be added serially, the process moves to step (71) and the program is added. When adding contacts in series, there is only one way to add contacts, one in the cursor position memory area CPA.
The sequence stored at the address in the display program area DPA that corresponds to the address where is written, that is, the address whose relative address with respect to the first address of the display program area is equal to the relative address of the address where 1 is written. Program modification is completed by inserting a program that tests specified input elements before the program. On the other hand, when the contacts are connected in parallel to the circuit shown in FIG. 7a, there are four modes MODE1 to MODE4 as shown in FIGS. 11a to 14a, and steps (72) to (74) determines the mode of contact addition. In this case, there is a test program that tests contact I1 before the test program that tests contacts I2 to I4 in the circuit section where the contacts are connected in parallel, and since there is an output command after the test program that tests contacts I2 to I4 in the circuit section where the contacts are connected in parallel, It is determined in step (72) that there is a contact at
It is determined that the mode is MODE3. If it is determined that the connection mode is MODE 3, the process moves from step (74) to step (79), where additional modification of the program is performed. First, in step (79), as shown in FIG.
After the address, the data of SKP and SOFO1 are written, and then in step (80), the output command YONO1 is shifted by three addresses to the larger address, and when the shift is completed, the process moves to step (81) as shown in Figure 15b. Write the program TNAI5 that tests the branch instruction and additional contacts on top of the output instruction. After this, the process moves to step (82) and the memory address in the display program area DPA corresponding to the address where 1 is written in the cursor position memory area, in this example, addresses R+1 to R+3, are stored. There is. The sequence program is 1 as shown in Figure 15c.
Shift one address at a time to the larger address, and in step (83) insert a branch instruction JMN above this to the 15th
The program modification is completed as shown in Figure d. FIGS. 11b to 14b show modified sequence programs for each connection mode,
The program with a double circle in the margin is the 10th program.
It is automatically inserted by the modification routine shown in the figure. In this way, the modified sequence program is written to its original location in the program store area PSA, as described above, and then transferred to the memory 11 of the sequence controller 10 to complete the modification. In the above embodiment, the program was modified by inserting branch instructions before and after the test program for testing the contacts in the circuit section where the contacts are connected in parallel. If arithmetic processing is performed by using a down stack to store intermediate results of the calculation, the intermediate results of the calculation are stored in the pushdown stack before the test program that tests the contacts in the circuit section. Insert an instruction to store in the pushdown stack, and after the test program, insert a program to test additional contacts and an instruction to perform a logical OR between this test result and the intermediate result stored in the pushdown stack. Just do it. As described above, in the program correction device of the present invention, when the circuit section to which newly added contacts are connected in parallel is specified by operating the cursor shift key and the cursor leave key, the connection mode of the additional contacts is automatically changed. When the test command to test the added contacts and the contacts are connected in parallel before and after a series of test programs that test multiple contacts in the specified circuit section according to the results of this determination, Since the necessary auxiliary commands are automatically added and inserted, the operator only has to input the type and input/output address of the additional contact after specifying the circuit section in which additional contacts are to be connected in parallel. You can modify the circuit simply by For this reason,
Not only can programs be modified by adding contacts in a short time, but programs can also be modified without any knowledge of the usage or properties of the command words used in sequence controllers, making it easy for workers who understand relay circuits to do so. The advantage is that anyone can modify the program.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of additionally connecting contacts to a circuit in parallel, Fig. 2 and subsequent figures show embodiments of the present invention, and Fig. 2 shows a state in which a program correction device is connected to a sequence controller. block diagram,
3 is a diagram showing operation keys provided on the operation panel 21 in FIG. 2, FIGS. 4a and 4b are flowcharts showing the operation of the arithmetic control circuit 22 in FIG. The figure shows the area division of the buffer memory 23 in FIG.
Figure 6a is a diagram showing an example of a relay circuit, and Figures 6b and c are display program areas in Figure 5.
A diagram showing the contents of DPA and cursor position storage area CPA, Figures 7 a to c are CRT27 in Figure 2.
FIGS. 8 to 10 are flowcharts showing the operation of the arithmetic and control circuit 22 in FIG. 2 during program correction, and FIGS.
b - Figures 14a and 14b are diagrams showing how contacts are added to the circuit shown in Figure 7a and the sequence program after the contacts are added. Figures 15a to d are diagrams showing the sequence program in the display program area DPA when modifying the program. FIG. 3 is a diagram showing changes in data. DESCRIPTION OF SYMBOLS 10... Sequence controller, 11... Storage unit, 20... Program correction device, 21... Operation panel, 22... Arithmetic control circuit, 23... Buffer memory, 24... Refresh memory, 25... Pattern generator, 26... Video signal generation circuit, 27...
CRT, 28...Display control circuit.

Claims (1)

[Claims] 1. A device for modifying a sequence program written in a memory of a sequence controller, which comprises:
a display means for converting a series of sequence programs relating to on/off of predetermined output elements into a ladder diagram using relay contacts and displaying the same on a display; a shift key for shifting a cursor with reference to the ladder diagram on the display; A section that has a cursor leave key that leaves a cursor on multiple contacts in a circuit section to which newly added contacts are connected in parallel, and specifies a circuit section to which additional contacts are to be connected in parallel based on the memory of the cursor leave position. specifying means, and determining whether there is a contact before the circuit section specified by the section specifying means and whether or not there is an output element after the circuit section, and determining the connection mode of the additional contact. If the mode determining means determines that there is no contact before the circuit section, the output command, etc. following the test command for the contact in the circuit section is shifted to a predetermined location and shifted. A branch instruction and an additional contact test instruction are inserted before the output instruction, etc., and if it is determined that there is a contact before the circuit section, an output instruction following the contact test instruction within that circuit section is inserted. etc. to a predetermined address, and a branch instruction and an additional contact test instruction are inserted before the shifted output instruction, etc. At the same time, a contact test instruction in the circuit section is shifted to a predetermined address and the shifted test instruction is inserted. A program correction device for a sequence controller, comprising an instruction insertion means for inserting a branch instruction before the program.