JPH1195815A - Sequence controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sequence controller which allows the high-speed processing of an arithmetic instruction while securing the identity of a user program inside a terminal for program development and the user program up-loaded from a PLC. SOLUTION: This controller is provided with an instruction conversion part 10 for converting the user program sent from the terminal for the program development to a description language of a sequence instruction and an instruction inverse conversion part 40 for inversely converting the sequence instruction to the language of the terminal and sending it to the terminal and a sequence program execution part 30 for executing the sequence instruction is provided with a programmable controller for dividing a normal processing and the high-speed processing by the form of the sequence instruction. In this case, the instruction conversion part 10 performs conversion for the high-speed processing for the sequence instruction pertinent to the high-speed processing by changing the form of the sequence instruction among the ones to be the normal processing by the initial sequence instruction and the instruction inverse conversion part 40 defines that the conversion for the normal processing is performed and performs inverse conversion to the sequence conversion for which the conversion for the high-speed processing is performed in the instruction conversion part 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sequence control device used for controlling a machine tool or the like, and more particularly to an improvement for executing a sequence operation command at a high speed.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing the configuration of a conventional PLC program development device. In the figure, a terminal for program development creates and edits a user program, and downloads and uploads it to a programmable controller (hereinafter referred to as “PLC”). The PLC controls a machine tool or the like according to a user program, and uses a specific language such as a ladder program or a general-purpose language such as BASIC. The instruction converter 10 converts a user program sent from a program development terminal into a PLC execution language. The sequence program memory 20 is an area for storing sequence commands. The sequence program execution unit 30 executes a sequence command stored in the sequence program memory 20, and corresponds to, for example, an actuator for moving a tool or a switch for detecting movement of a product.
The instruction reverse conversion unit 40 includes the sequence program memory 20
Is converted into a terminal language for program development.

In the device configured as described above, a user program is read from the sequence program memory 20 to analyze a sequence command, and read and write parameters are sequentially performed.
Then, in order to execute instructions at high speed, frequently used instructions such as a data movement instruction (MOV) and a comparison (CM
P), the operation instruction (CAL instruction) reads out and analyzes the sequence instruction, reads the first parameter (par1) at the same time, and sends the first parameter to the sequence program execution unit 30 in advance when executing the target sequence instruction. Thus, the time for reading out the first parameter is reduced.

FIG. 4 is a diagram for explaining the form of an operation instruction. The operation instructions include various operators such as +,-, &, and | as operators. And the operator is the first parameter (par
1) and the second parameter (par2) are calculated, and the calculation result is calculated as the third
Some are stored in the parameter (par3) and some are stored in a register by adding an operation to a register or a constant (Equations 1 to 3).

FIG. 5 is a diagram for explaining a mode of a comparison operation instruction. In comparison operation instructions, operators <, <=,
>,> =, <>, =, Etc. The operators include those that perform a comparison operation on the first parameter (par1) and the second parameter (par2), and those that perform a comparison operation on registers and constants (Equations 4 to 7).

[0006]

However, in a system in which a sequence instruction is read out and analyzed and a first parameter is read ahead and executed at high speed, a sequence instruction for normal processing and a sequence instruction for high speed processing are separately prepared. Therefore, there is a problem that management of the types of sequence instructions becomes complicated. In addition, since the high-speed execution instruction code is finite, for example, the above-described Expression 2 can be substituted by exchanging the first parameter and the second parameter of Expression 1, and therefore, is excluded from high-speed processing targets. I have.
Then, the user needs to be aware of the order of the parameters when creating the program, and there is a problem that the operation of creating the user program becomes complicated. In addition, since the high-speed execution instruction codes are finite, they are excluded from the target of the high-speed processing in the same manner in Expression 6. That is, in Equation 6, the first
If the parameter and the second parameter are exchanged to form the formula (5), high-speed processing can be performed.
And Equation 6 are the same.

Therefore, when an operation instruction is applied to the expression 2 in the user program, the first parameter and the second parameter of the expression 2 are exchanged for high-speed processing of the operation instruction, and the expression 1 is replaced with the expression 1, and the sequence program memory is replaced. It is also conceivable to store them in the storage area 20. However, it is required that the user program in the terminal for program development and the user program uploaded from the sequence program memory 20 of the programmable controller be the same. Therefore, when the first parameter and the second parameter of Expression 2 are exchanged, there is a problem that even if an attempt is made to restore the instruction by the instruction reverse conversion unit 40, the original instruction cannot be restored.

[0008] The present invention has solved the above-mentioned problem, and a user program in a terminal for program development and P
It is an object of the present invention to provide a sequence control device capable of exchanging the order of parameters when storing in a PLC for high-speed processing of an operation instruction while ensuring the sameness as a user program uploaded from an LC.

[0009]

According to one aspect of the present invention, there is provided a sequence control apparatus comprising: a program development terminal for creating or editing a user program; An instruction conversion unit 10 for converting the sent user program into a language for describing sequence instructions, and a sequence program memory 20 for storing sequence instructions in the language converted by the instruction conversion unit
And a sequence program execution unit 30 for executing a sequence instruction stored in the sequence program memory.
And a command reverse conversion unit 40 that reversely converts the sequence command stored in the sequence program memory into the language of the terminal and sends the command to the terminal. In a sequence control device having a programmable controller that divides processing and high-speed processing, the instruction conversion unit performs a normal processing in an initial sequence instruction of a user program sent from the terminal, and converts the format of the sequence instruction into a normal program. By changing the sequence instruction corresponding to high-speed processing, conversion for high-speed processing is performed, and the instruction reverse conversion unit performs normal processing on the sequence instruction that has been converted for high-speed processing in the instruction conversion unit. It is characterized in that inverse conversion is performed assuming that conversion has been performed.

According to the first aspect of the present invention, since the user program is created or edited on the program development terminal, the programmable controller does not need to have the function of the man-machine interface. . The developed user program is stored in the sequence program memory 20. The instruction conversion unit and the instruction reverse conversion unit absorb the difference in the language system between the program development terminal and the programmable controller, and facilitate the exchange of user programs. The sequence program execution unit divides normal processing and high-speed processing according to the format of a sequence instruction. The instruction conversion unit performs a conversion for high-speed processing for a sequence instruction corresponding to high-speed processing by changing the format of the sequence instruction in the normal processing in the initial sequence instruction among the user programs sent from the terminal, It is stored in the sequence program memory 20. The instruction reverse conversion unit performs reverse conversion on the sequence instruction that has been converted for high-speed processing by the instruction conversion unit, assuming that conversion for normal processing has been performed, and transmits the sequence instruction to the terminal. Thereby, the identity between the user program in the terminal for program development and the user program uploaded from the PLC is ensured.

Here, a high-speed processing flag for displaying whether or not conversion for high-speed processing has been performed by changing the format of the sequence instruction is provided inside the sequence instruction. The conversion unit sets the flag for high-speed processing when performing conversion for high-speed processing, and the instruction reverse conversion unit converts the sequence instruction with the flag for high-speed processing into the format of the sequence instruction by the instruction conversion unit. Is configured to perform the inverse conversion in the format before the change.
Then, the instruction reverse conversion unit can easily determine whether or not the sequence instruction has been converted for high-speed processing by the instruction conversion unit.

Next, as in claim 3, the format of the sequence instruction for distinguishing between the normal processing and the high-speed processing of the sequence program execution unit is determined in advance by using the type of the operation instruction and the type and order of the arranged parameters. With such a configuration, the functions required for the instruction conversion unit and the instruction reverse conversion unit are limited to a specific function of converting the order of parameters. Here, as in claim 4, the format of the sequence instruction for dividing the normal processing and the high-speed processing of the sequence program execution unit is such that even if the same operation instruction is used, the normal processing is performed when the first parameter is a constant. When the first parameter is a register, high-speed processing is performed. In the user program of the terminal, when the first parameter is a constant and the second parameter includes an operation instruction of the register, the instruction conversion unit and the instruction reverse conversion unit Is the first parameter of the operation instruction and the second
This will change the order of the parameters. Claim 5
Thus, it is clarified that the operation instruction is a data movement instruction, an operation instruction such as comparison, addition / subtraction, or a logical operation.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a configuration block diagram showing one embodiment of the present invention. In FIG. 1, components having the same functions as those in FIG. In the figure, a high-speed processing flag 32 indicating whether or not conversion for high-speed processing has been performed by changing the format of the sequence instruction is provided inside the sequence instruction, and stored in the sequence program memory 20. Sequence instruction format change unit 1
In the user program sent from the terminal to the command conversion unit 10, the initial sequence command is a normal process. By changing the format of the sequence command, it is determined whether there is a sequence command corresponding to high-speed processing. To perform high-speed processing of the sequence instruction to be executed, and set a high-speed processing flag. The format change instruction determination unit 32 changes the format of the instruction conversion unit 10 for the sequence instruction with the high-speed processing flag set among the sequence instructions read from the sequence program memory 20 to the instruction reverse conversion unit 30. Performs inverse conversion using the format before the conversion.

FIG. 2 shows an instruction conversion unit 10 and an instruction reverse conversion unit 4.
9 is a flowchart for explaining the operation of the "0." The instruction conversion unit 10
First, it is determined whether the sequence instruction is an operation instruction (S1
0), if it is an operation instruction, it is determined whether or not it corresponds to the form of Equation 2 shown in FIG. 4 or Equation 6 shown in FIG. 6 (S12). If so, the parameters 1 and 2 are exchanged (S14), and the high-speed processing flag 32 is set (S16). If not, the high-speed processing flag 32 is cleared (S
18). Then, the instruction conversion unit 10 converts the sequence instruction (S20), and writes it in the sequence program memory 20 together with the high-speed processing flag 32 (S22). Thereby, the conversion of the sequence instruction is completed.

The instruction reverse conversion unit 40 first determines whether the sequence instruction is an operation instruction (S30), and if it is an operation instruction, determines whether the high-speed processing flag 32 is set or cleared (S32). If the high-speed processing flag 32 is set, the parameters 1 and 2 are exchanged (S3).
4). In either case, the command reverse conversion unit 40 performs reverse conversion of the sequence command (S36) and sends the sequence command to the terminal. Thus, the inverse conversion ends.

In the above embodiment, when the operation instruction satisfies Expression 2, the expression 2 is used for high-speed processing of the operation instruction.
By exchanging the first parameter and the second parameter of
Although the example in which the processing is stored in the sequence program memory 20 instead of the above is shown, the present invention is not limited to this. At this time, any format that converts the format of the sequence instruction for high-speed processing may be used. Further, in the above embodiment, the presence / absence of conversion is determined by setting / setting the high-speed processing flag 32.
Although the one that can be identified by the instruction reverse conversion unit 40 using clear is shown, a table indicating whether or not there is conversion may be provided separately from the sequence instruction.
Anything that can identify the presence or absence of conversion with 0 may be used.

[0017]

As described above, according to the first aspect of the present invention, the command conversion unit 10 performs the normal processing for the initial sequence command of the user program sent from the terminal, By changing the format, a sequence instruction corresponding to high-speed processing is converted for high-speed processing and stored in the sequence program memory 20, so that high-speed processing in the sequence program execution unit 30 can be ensured. In addition, the instruction reverse conversion unit 40 performs reverse conversion on the sequence instruction that has been converted for high-speed processing by the instruction conversion unit as if conversion for normal processing has been performed, and transmits the sequence instruction to the terminal. The identity between the user program in the terminal for program development and the user program uploaded from the PLC is ensured.

According to the second aspect of the present invention, the high-speed processing flag 32 for displaying whether or not conversion for high-speed processing has been performed by changing the format of the sequence instruction is provided inside the sequence instruction. The instruction conversion unit 10 sets the high-speed processing flag when performing conversion for high-speed processing.
Then, the instruction reverse conversion unit 40 can easily determine whether or not the instruction is a sequence instruction that has been converted for high-speed processing by the instruction conversion unit 10 based on whether or not the high-speed processing flag is set.

Here, as in claim 3, the format of the sequence instruction for distinguishing between the normal processing and the high-speed processing of the sequence program execution unit 30 is arranged according to the type of the operation instruction as shown in equations 2 and 6. When configured so as to be determined in advance using the type and order of the parameters, the functions required for the instruction conversion unit and the instruction reverse conversion unit are limited to the specific conversion of the order of the parameters. Here, claim 4
As described above, the format of the sequence instruction for distinguishing between the normal processing and the high-speed processing of the sequence program execution unit is such that even if the same operation instruction is used, the normal processing is performed when the first parameter is a constant, and the first parameter is stored in the register. When high-speed processing is performed, in the user program of the terminal, if the first parameter is a constant and the second parameter includes an operation instruction of a register, the instruction conversion unit and the instruction inverse conversion unit perform the first operation instruction operation. The order of the parameter and the second parameter will be changed. In claim 5, it is clarified that the operation instruction is a data movement instruction, an operation instruction such as comparison, addition / subtraction, or a logical operation.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart illustrating operations of an instruction conversion unit 10 and an instruction inverse conversion unit 40;

FIG. 3 is a configuration block diagram of a conventional PLC program development device.

FIG. 4 is a diagram illustrating a form of an operation instruction.

FIG. 5 is a diagram illustrating an aspect of a comparison operation instruction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Instruction conversion part 20 Sequence program memory 30 Sequence program execution part 40 Instruction reverse conversion part

Claims (5)

[Claims] A terminal for developing a program for creating or editing a user program, an instruction conversion unit (10) for converting a user program sent from the terminal into a language for describing a sequence instruction, A sequence program memory (20) for storing sequence instructions in a language converted by the conversion unit, a sequence program execution unit (30) for executing sequence instructions stored in the sequence program memory, and a sequence program memory stored in the sequence program memory A command reverse conversion unit (40) for converting the sequence command into the language of the terminal and sending the command to the terminal, wherein the sequence program execution unit classifies normal processing and high-speed processing according to the format of the sequence command. A sequence controller having a programmable controller that performs The command conversion unit converts the format for the high-speed processing by changing the format of the sequence command in the normal processing in the initial sequence command of the user program sent from the terminal. The instruction reverse conversion unit performs a reverse conversion on the sequence instruction that has been converted for high-speed processing by the instruction conversion unit, assuming that conversion for normal processing has been performed. Control device. 2. A high-speed processing flag for displaying whether or not conversion for high-speed processing has been performed by changing the format of the sequence instruction is provided inside the sequence instruction. The high-speed processing flag is set when performing conversion for processing, and the instruction reverse conversion unit changes the format of the sequence instruction by the instruction conversion unit for the sequence instruction with the high-speed processing flag set. 2. The sequence control device according to claim 1, wherein the inverse conversion is performed in a format before the conversion. 3. The format of a sequence instruction for distinguishing between normal processing and high-speed processing of the sequence program execution unit is determined in advance by using the type of operation instruction and the type and order of arranged parameters, and The unit performs the conversion for high-speed processing by changing the order of the parameters, the type of the operation instruction and the parameter are the same, the instruction reverse conversion unit, for a sequence instruction that has been converted for high-speed processing, 3. The sequence control device according to claim 1, wherein the reverse conversion is performed in the order of the parameters before the change. 4. The format of a sequence instruction for distinguishing between normal processing and high-speed processing of the sequence program execution unit is such that even if the same operation instruction is used, normal processing is performed when the first parameter is a constant, and the first parameter is In the case where the register is a register, high-speed processing is performed. In the user program of the terminal, when the first parameter is a constant and the second parameter includes an operation instruction of the register, the instruction conversion unit performs the first operation of the operation instruction. The conversion for high-speed processing is performed by changing the order of the parameter and the second parameter, and the instruction reverse conversion unit performs the reverse conversion in the order before the change in the order of the first parameter and the second parameter of the operation instruction. The sequence control device according to claim 3, wherein: 5. The sequence control device according to claim 4, wherein the operation instruction is a data movement instruction, an operation instruction such as comparison, addition / subtraction, or logical operation.