JP3407614B2 - Sequence controller - Google Patents

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 sequence operation instructions at high speed.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram of a conventional PLC program development apparatus. In the figure, a terminal for program development is for creating or editing a user program, and is downloaded or uploaded to a programmable controller (hereinafter referred to as "PLC"). The PLC controls a machine tool or the like according to a user program, and a specific language such as a ladder program or a general-purpose language such as BASIC is used. The instruction conversion unit 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 instructions. 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 uses the sequence program memory 20.
The sequence instruction stored in is converted into the language for the terminal for program development.

In the apparatus thus constructed, the user program is read from the sequence program memory 20, the sequence command is analyzed, and the parameters are read and written sequentially.
Then, in order to execute instructions at high speed, frequently used instructions such as data move instructions (MOV) and comparison (CM
P) and the arithmetic instruction (CAL instruction) read the sequence instruction and analyze it, and at the same time prefetch the first parameter (par1) and send the first parameter to the sequence program execution unit 30 in advance when the target sequence instruction is executed. By doing so, the time for reading the first parameter is shortened.

FIG. 4 is a diagram for explaining a mode of the operation instruction. There are various types of operation instructions such as +,-, &, | 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 the register by performing arithmetic operation on the register or constant (Equation 1 to Equation 3).

FIG. 5 is a diagram for explaining a mode of the comparison operation instruction. In comparison operation instructions, operators <, <=,
There are various types such as>,> =, <>, and =. There are operators that perform a comparison operation on the first parameter (par1) and the second parameter (par2), and operators that perform a comparison operation on registers and constants (Equations 4 to 7).

[0006]

However, in the method in which the sequence command is read and analyzed and the first parameter is prefetched at the same time and is executed at high speed, the sequence command for normal processing and the sequence command for high speed processing are prepared separately. However, there is a problem in that the management of the types of sequence instructions becomes complicated. Further, since the high-speed execution instruction code is finite, for example, the above-mentioned formula 2 can be substituted by exchanging the first parameter and the second parameter of the formula 1, so that it is excluded from the target of high-speed processing. There is.
Then, the user needs to be conscious of the order of the parameters when creating the program, and there is a problem that the work of creating the user program becomes complicated. It should be noted that since the high-speed execution instruction code is finite, the point of excluding it from the target of high-speed processing is the same in the equation 6. That is, in Equation 6, the first
High-speed processing is possible if the parameter and the second parameter are exchanged to obtain the form of the expression 5, and therefore the expression 5 is also used as the comparison operation.
And Equation 6 are the same.

Therefore, when the arithmetic instruction is applied to the equation 2 in the user program, the first parameter and the second parameter of the equation 2 are exchanged for high speed processing of the arithmetic instruction and replaced with the equation 1 to replace the sequence program memory. It is also conceivable to store in 20. However, the user program in the terminal for program development and the user program uploaded from the sequence program memory 20 of the programmable controller are required to be the same. Therefore, if the first parameter and the second parameter of Expression 2 are exchanged, there is a problem that the instruction inverse conversion unit 40 cannot restore the original instruction even if the instruction inverse conversion unit 40 restores the original instruction.

The present invention solves such a problem by providing a user program and a P program in a terminal for program development.
An object of the present invention is to provide a sequence control device capable of exchanging the order of parameters in a PLC for high-speed processing of operation instructions while ensuring the sameness with a user program uploaded from LC.

[0009]

In order to achieve the above object, a sequence control device according to claim 1 of the present invention comprises a program development terminal for creating and editing a user program, and a terminal for program development. A command conversion unit 10 for converting the sent user program into a description language for sequence commands, and a sequence program memory 20 for storing the sequence commands in the language converted by the command conversion unit.
And a sequence program execution unit 30 for executing the sequence instructions stored in the sequence program memory.
And a command reverse conversion unit 40 that reverse-converts the sequence command stored in the sequence program memory into the language of the terminal and sends it to the terminal, and the sequence program execution unit normally operates according to the format of the sequence command. In a sequence control device having a programmable controller that divides processing and high-speed processing, the instruction conversion unit is a normal processing for an initial sequence instruction in a user program sent from the terminal, and a sequence instruction format is set. By changing the sequence instruction corresponding to the high-speed processing, conversion for high-speed processing is performed, and the instruction reverse conversion unit performs normal processing for the sequence instruction converted by the instruction conversion unit for high-speed processing. The feature is that the inverse conversion is performed assuming that the conversion for the target has been performed.

According to claim 1 of the present invention, since the user program is created or edited in the terminal for program development, the programmable controller side does not need to have the man-machine interface function. . The developed user program is stored in the sequence program memory 20. The instruction conversion unit and the instruction inverse conversion unit absorb the difference in language system between the terminal for program development and the programmable controller to facilitate the transfer of the user program. The sequence program execution unit classifies normal processing and high-speed processing according to the format of the sequence instruction. Of the user program sent from the terminal, the instruction conversion unit performs normal processing for the initial sequence instruction, and performs conversion for high-speed processing on the sequence instruction corresponding to high-speed processing by changing the format of the sequence instruction, It is stored in the sequence program memory 20. The instruction reverse conversion unit performs reverse conversion on the sequence command converted by the command conversion unit for high-speed processing, assuming that the conversion has been performed for normal processing, and transmits the sequence command to the terminal. This ensures the identity between the user program in the terminal for program development and the user program uploaded from the PLC.

Here, as in claim 2, a high-speed processing flag for displaying whether or not conversion for high-speed processing is performed by changing the format of the sequence instruction is provided inside the sequence instruction, The conversion unit sets the high-speed processing flag when performing conversion for high-speed processing, and the instruction inverse conversion unit sets the format of the sequence instruction by the instruction conversion unit for the sequence instruction for which the high-speed processing flag is set. Inverse conversion is performed according to the format before changing.
Then, the instruction inverse conversion unit can easily determine whether or not the sequence instruction has been converted by the instruction conversion unit for high-speed processing.

Next, as described in claim 3, the format of the sequence instruction for distinguishing the normal processing and the high-speed processing of the sequence program execution unit is preliminarily determined by using the type of the operation instruction and the type and order of the arranged parameters. When configured as defined, the functions required by the instruction conversion unit and the instruction inverse conversion unit are limited to the specific conversion of the order of parameters. Here, as in claim 4, the format of the sequence instruction for distinguishing 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, High-speed processing is performed when the first parameter is a register, and in the user program of the terminal, when the first parameter is a constant and the second parameter includes an operation instruction of a register, an instruction conversion unit and an instruction inverse conversion unit. Is the first parameter and second parameter of the arithmetic instruction
It will change the order of the parameters. Incidentally, claim 5
Then, it is clarified that the operation instruction is an operation instruction such as a data movement instruction, comparison, addition / subtraction, and logical operation.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. Incidentally, in FIG. 1, components having the same functions as those in FIG. In the figure, a high-speed processing flag 32 that indicates 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 command format change unit 1
In the user program sent from the terminal to the instruction conversion unit 10, 2 is a normal process for the initial sequence command, and the presence or absence of a sequence command corresponding to high-speed processing is determined by changing the format of the sequence command. The sequence instruction to be converted is converted for high-speed processing, and the high-speed processing flag is set. The format change instruction determination unit 32 changes the format of the instruction conversion unit 10 for a sequence instruction with a high-speed processing flag set among the sequence instructions read from the sequence program memory 20 into the instruction inverse conversion unit 30. Inverse conversion is performed according to the format before.

FIG. 2 shows an instruction conversion unit 10 and an instruction inverse conversion unit 4.
9 is a flowchart illustrating the operation of 0. The command conversion unit 10
First, it is determined whether the sequence command is a calculation command (S1
0), if it is a calculation instruction, it is judged whether it corresponds to the format of Expression 2 shown in FIG. 4 or Expression 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 it does not correspond, 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). This completes the conversion of the sequence instruction.

The instruction reverse conversion unit 40 first determines whether the sequence instruction is an operation instruction (S30), and if the operation instruction is an operation instruction, determines whether the high-speed processing flag 32 is set or not (S32). If the high-speed processing flag 32 is set, the parameters 1 and 2 are exchanged (S3).
4). Then, in any case, the instruction reverse conversion unit 40 performs reverse conversion of the sequence command (S36) and sends it to the terminal. This completes the inverse conversion.

In the above embodiment, when the arithmetic instruction is applied to the equation 2, the equation 2 is used for high speed processing of the arithmetic instruction.
By exchanging the first parameter and the second parameter of
However, the present invention is not limited to this, and in short, when the normal processing and the high-speed processing are selectively used depending on the format of the sequence instruction, the user program is downloaded from the terminal. At this time, the format of the sequence instruction may be converted for high speed processing. Further, in the above-described embodiment, whether the conversion is performed or not is set by setting the high speed processing flag 32.
Although the one which can be identified by the instruction inverse conversion unit 40 by using the clear is shown, a table indicating the presence or absence of the 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 present invention as set forth in claim 1, the instruction conversion unit 10 is a normal process for the initial sequence instruction of the user program sent from the terminal, and the sequence instruction By changing the format, the sequence instruction corresponding to the high speed processing is converted for the high speed processing and stored in the sequence program memory 20, so that the high speed processing in the sequence program execution unit 30 can be secured. Further, since the instruction inverse conversion unit 40 performs inverse conversion on the sequence instruction converted by the instruction conversion unit for high-speed processing as conversion for normal processing, and transmits it to the terminal, The identity between the user program in the terminal for program development and the user program uploaded from the PLC is secured.

According to the present invention as set forth in claim 2, a flag for high speed processing 32 is provided inside the sequence instruction to display whether or not conversion for high speed processing is performed by changing the format of the sequence instruction. The instruction conversion unit 10 sets the high-speed processing flag when performing conversion for high-speed processing.
Then, the instruction inverse conversion unit 40 can easily determine whether or not the sequence instruction has been converted by the instruction conversion unit 10 for high speed processing depending on whether or not the high speed processing flag is set.

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

[Brief description of drawings]

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

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

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

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

FIG. 5 is a diagram illustrating a form of a comparison operation instruction.

[Explanation of symbols]

10 Command converter 20 Sequence program memory 30 Sequence program execution unit 40 Instruction reverse converter

Claims (5)

(57) [Claims] 1. A terminal for program development for creating and editing a user program, an instruction conversion unit (10) for converting the user program sent from this terminal into a description language for sequence instructions, and this instruction. A sequence program memory (20) for storing a sequence command in the language converted by the conversion unit, a sequence program execution unit (30) for executing the sequence command stored in the sequence program memory, and a sequence program memory stored in the sequence program memory. A sequence reverse conversion unit (40) that reversely converts the sequence command into the language of the terminal and sends the sequence command to the terminal, and the sequence program execution unit classifies normal processing and high-speed processing according to the format of the sequence command. In a sequence controller having a programmable controller for The instruction conversion unit performs conversion for high-speed processing of a sequence instruction corresponding to high-speed processing by changing the format of the sequence instruction in the normal processing of the initial sequence instruction of the user program sent from the terminal. The sequence is characterized in that the instruction inverse conversion unit performs inverse 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 is performed by changing the format of the sequence instruction is provided inside the sequence instruction, and the instruction conversion unit is configured to perform the high-speed processing. When the conversion for processing is performed, the high-speed processing flag is set, and the instruction reverse conversion unit changes the format of the sequence instruction by the instruction conversion unit with respect to the sequence command for which the high-speed processing flag is set. 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 the normal processing and the high-speed processing of the sequence program execution unit is predetermined by using the type of operation instruction and the type and order of arranged parameters, and the instruction conversion. The unit has the same type of operation instruction and parameter, performs conversion for high-speed processing by changing the order of parameters, the instruction inverse conversion unit, for the sequence instruction that has been converted for high-speed processing, 3. The sequence control device according to claim 1, wherein the sequence conversion device performs reverse conversion in the order before changing the order of the parameters. 4. The format of a sequence instruction for distinguishing 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 user program of the terminal, when the first parameter is a constant and the second parameter includes an arithmetic operation instruction of a register, the instruction conversion unit is configured to perform high-speed processing in the case of a register. 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 reverse conversion in the order before the change of 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 an operation instruction such as a data movement instruction, comparison, addition / subtraction, or logical operation.