JPH0695710A - Method for changing sequence program of programmable controller - Google Patents

Abstract

PURPOSE:To shorten the time required for changing a sequence program by permitting the use of all sequence instructions for the correction of the sequence program on a programming device except during the operation of a programmable controller. CONSTITUTION:A CPU 20 generates and edits the sequence program in accordance with a system program in a system memory 21, and program instructions to be changed or the like are temporarily stored in the work area of the system memory 21. The sequence program is generated and edited on a user program memory 22 and is transferred to the programmable controller through an I/O 23. Here, sequence instructions which can be changed during the operation of the programmable controller are limited. Corrected sequence instructions and contents are automatically detected, and the programming device automatically in structs the programmable controller of the corrected contents.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of changing a sequence program of a programmable controller for changing the sequence program executed by the programmable controller during operation of the programmable controller.

[0002]

2. Description of the Related Art Conventionally, it is known that a programmable controller arithmetically executes a sequence program to automatically control electronic equipment. The sequence program is created by a programming device connected to the programmable controller. The sequence program can be modified even while the programmable controller is operating. Since the sequence program is stored in the user program memory in the programmable controller, when the sequence instruction in this program is modified, the sequence program is sent to the programming device. The user displays the sequence program on the programming device and modifies the sequence instructions in the sequence program. After that, the grammatical check is performed on all the program instructions in the sequence program on the programming device according to the instruction of the grammatical check from the user. This grammar check is to perform some checks such as whether the sequence command is written in the correct format, and depending on the program command, whether it has the correct connection relationship with the adjacent program command. After the grammar check, the modified sequence program is sent to the programmable controller. The programmable controller has realized the change of the sequence program by exchanging the sequence program in the user program memory with the received sequence program.

[0003]

In the conventional method, even when only one sequence instruction is changed, the entire sequence program is stored in the programmable controller,
Must be transferred to or from the programming device.
The grammar check for the sequence instruction is also the target of the entire sequence program, and the unmodified sequence instruction must be checked. Therefore, it takes time to change the sequence program. In particular, when the sequence program is changed during the operation of the programmable controller, it is often urgently required by the user to reduce the time required for changing the sequence program.

Therefore, in view of the above points, an object of the present invention is to provide a method of changing a sequence program of a programmable controller capable of shortening the change time of the sequence program.

[0005]

In order to achieve such an object, the invention of claim 1 transfers a sequence program executed by a programmable controller from the programmable controller to a programming device, and on the programming device, In a method of changing a sequence program of a programmable controller that makes a correction to a transferred sequence program, permitting use of all sequence instructions for correction of the sequence program on the programming device except when the programmable controller is in operation, The type of sequence command that can be used for the modification is limited during the operation of the programmable controller.

According to a second aspect of the invention, the sequence program executed by the programmable controller is transferred from the programmable controller to the programming device, and the sequence program of the programmable controller is modified on the programming device to modify the transferred sequence program. In the method, when the sequence program is modified while the programmable controller is in operation, the programming device detects the modification content of the sequence command in the sequence program, and the modification content of the detected sequence command is detected by the programmable controller. To the programmable controller, according to the received correction content,
It is characterized by changing a sequence instruction in a sequence program being executed.

[0007]

According to the first aspect of the present invention, the target of the grammar check is reduced by limiting the sequence instruction used for the correction.
Therefore, the processing time for grammar check is shortened. Claim 2
In the invention, only the correction content of the sequence command is transmitted from the programming device, and the programmable controller side partially modifies the sequence program based on the correction content.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

Prior to the description of the present invention, a programmable controller and a programming device will be described. FIG. 2 shows a circuit configuration of a portion of the programmable controller relating to the present invention. FIG. 3 shows the circuit configuration of the programming device.

In FIG. 2, the central processing unit (CP
U) 10 executes the control of the entire apparatus according to the system program in the system memory 11. The CPU 10 automatically controls the electronic device according to the sequence program stored in the user program memory 12 during system operation. The sequence program is transferred from the programming device via the interface (I / O) 13 and written in the user program memory 12 by the CPU 10. However, in the case of changing the program instruction according to the present invention, only the correction content constituted by the correction portion and its position is instructed from the programming device, and the CPU 10 writes only the correction portion.

In FIG. 3, the central processing unit (CP
U) 20 creates and edits a sequence program according to the system program in the system memory 21. In the system memory 21, in addition to the above system programs, a program area for storing the program according to the present invention and a work area for storing input / output information for the CPU 20 are provided. Keyboard 2 in the work area
The program instructions and the like to be changed input from the No. 4 are temporarily stored.

A sequence program is created and edited on the user program memory 22. Keyboard 24
The operation instruction and the program editing content for the CPU 20 are input from. The sequence program being created or edited is displayed on the display unit 25. The created and modified sequence program is transferred to the programmable controller via the I / O 23.

The first feature of the present embodiment is to limit the sequence instructions that can be changed during the operation of the programmable controller and reduce the correction amount of the sequence program.
As a second feature, the modified sequence command and its content are automatically detected by the programming device, and the modification content of the detected sequence command is automatically instructed from the programming device to the programmable controller.

The correction process will be described below. FIG. 1 shows the contents of a sequence program changing process executed on the programming device side. When the correction mode of the sequence program is input from the keyboard 24, the CPU 20 executes the control procedure of FIG.
Read from and execute. When the CPU 20 detects that the system (programmable controller) is currently in operation by referring to the operation mode flag that is turned on when the system is activated, the process shifts to a processing procedure according to the present invention after S20, which will be described later. On the other hand, when the system is not in operation, the modification process is performed to make all sequence commands usable as usual (S150).

When the system is in operation, first, the sequence program to be corrected is transferred from the programmable controller to the programming device and read into the user program memory 22 of the programming device by the same processing procedure as the conventional one (S20). The CPU 20 displays this sequence program on the display 25 in the form of the sequence circuit diagram A of FIG. The user looks at this display and indicates the position to correct the sequence command with the keyboard 24, and inputs the sequence command to be corrected. The CPU 20 displays the correction sequence command input at the display position corresponding to the designated position (see the changed program in FIG.
S30).

The CPU 20 determines whether or not the inputted correction sequence command is a command of a type predetermined as usage permission. More specifically, the instruction is configured in one step such as a contact instruction and a coil (output) instruction, and the instruction not related to other sequence instructions is permitted to be used. When the contact instruction is changed as shown in FIG. 5, the CPU 20 detects from the format of the input instruction that the contact instruction is changed (S40). Next, the CPU 20 identifies the correction content of the sequence command (S100). For this purpose, the CPU 20 compares the uncorrected sequence command on the user program memory 22 with the input correction sequence command based on the correction position designated by the user, and detects a mismatch. This disagreement is the correction point. This modified portion is the instruction code portion in the sequence instruction (see FIG. 5).
(Corresponding to the contact symbol in the example of 1), it is determined that the change is related to the type of instruction. Further, if the corrected portion is the operand portion in the sequence instruction (corresponding to the contact identification name in FIG. 7 or the set value of the timer instruction in FIG. 9), it is determined that the parameter has been changed.

The CPU 20 creates a correction command (correction content of the present invention) to be transmitted to the programmable controller based on the above determination result (S110). The correction instruction is, for example, an instruction code indicating that it is an instruction related to the correction of a sequence instruction, a correction position of the sequence instruction on the sequence program, the type of correction (indicates whether the instruction code is changed or the operand is changed), and should be changed It consists of sequence instructions. The created modification instruction is I /
It is transmitted to the programmable controller via O23 (S120).

This correction instruction is transferred to the CPU 10 via the I / O 13 of the programmable controller. When the CPU 10 of the programmable controller detects the input of the correction instruction by the command analysis, the control procedure of FIGS. 4, 6 and 8 is sequentially executed to identify the content of the correction instruction, and according to the content instructed by the correction instruction. Execute the modification of the sequence instruction. Figure 4 shows how to change the contact instruction code
The change procedure is detected by the control procedure (S20).
0). The CPU 10 reads the sequence instruction to be modified contained in the modification instruction and performs a grammar check on the format of the instruction code and the operand part (S).
210-S240). If there is no error in the format, the correction position indicated in the correction instruction is converted into the address of the user program memory 12, and the sequence instruction to be corrected is written to this address (S250 → S).
260). As a result, the sequence program currently being executed is changed in the programmable controller.

The change of the operand of the sequence instruction and the change of the set value are performed by the control procedures of FIGS. 6 and 8, respectively. Similar to the above, these procedure contents are procedures for writing in the user program memory 12 after the grammar check, and detailed description thereof will be omitted. As explained above,
In this embodiment, sequence instructions that can be changed are adjacent sequence instructions.
Since the instruction is not related to the can instruction, the target of the grammar check is only the sequence instruction to be corrected, and the grammar check time is shortened compared to the conventional case. Further, the user only needs to partially modify the sequence program on the programming device and does not need to instruct the programmable controller.

In addition to this embodiment, the following example can be carried out.

1) In the present embodiment, the grammar check is performed on the programmable controller side in consideration of noise mixing when the correction instruction is transferred, but it may be performed on the programming device side. In this case, the grammar check may be performed every time the correction sequence command is input, or the correction sequence command may be collectively performed. At this time, the programmable controller does not perform the grammar check, but only writes the correction sequence command.

2) In this embodiment, only the sequence command to be modified is transmitted to the programmable controller. However, after modifying the sequence program by limiting the modifiable sequence command, the modification is performed as in the conventional case. It is also possible to send the entire sequence program that has been completed. In this case, it goes without saying that the grammar check is performed on the programming device side and the check target is only the limited sequence instruction. For this purpose, a grammar check program with limited sequence instructions and a grammar check program with no limited sequence instructions are prepared, and the grammar check programs are switched and used during system operation and during system initialization before system operation. .

3) In this embodiment, when a sequence command that cannot be used is used for modifying the sequence command, a message indicating that the sequence command cannot be used is displayed (S60 in FIG. 1). At this time, it is advisable to display a guide of the types of sequence commands that can be used.

[0024]

As described above, according to the present invention, the time required for changing the sequence program can be shortened as compared with the conventional technique, and therefore, the effect that the performance of the programmable controller can be improved can be obtained.

[Brief description of drawings]

FIG. 1 is a flowchart showing a procedure for changing a sequence program on a programming device side according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a programmable controller according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a circuit configuration of a programming device according to an embodiment of the present invention.

FIG. 4 is a flowchart showing a sequence program change processing procedure on the programmable controller side according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an example of changing a sequence program.

FIG. 6 is a flowchart showing a sequence program change processing procedure on the programmable controller side according to the embodiment of the present invention.

FIG. 7 is an explanatory diagram showing another example of changing the sequence program.

FIG. 8 is a flowchart showing a procedure for changing a sequence program on the programmable controller side according to the embodiment of the present invention.

FIG. 9 is an explanatory diagram showing still another example of changing the sequence program.

[Explanation of symbols]

 10, 20 CPU 11, 21 System memory 12, 22 User program memory 13, 23 I / O 24 Keyboard 25 Display

Claims (2)

[Claims] 1. A method for changing a sequence program of a programmable controller, wherein a sequence program executed by a programmable controller is transferred from the programmable controller to a programming device, and the transferred sequence program is modified on the programming device. The use of all sequence instructions for the modification of the sequence program on the programming device is permitted except during the operation of the controller, and the type of sequence instruction that can be used for the modification is limited during the operation of the programmable controller. A method for changing a sequence program of a programmable controller, which is characterized by the above. 2. A method for changing a sequence program of a programmable controller, wherein a sequence program executed by a programmable controller is transferred from the programmable controller to a programming device, and the transferred sequence program is modified on the programming device. When the sequence program is modified during the operation of the controller, the programming device detects the modification content of the sequence command in the sequence program, and transmits the modification content of the detected sequence command to the programmable controller, The programmable controller changes the sequence instruction in the sequence program currently being executed according to the received correction contents. How to change the controller controller sequence program.