JPH10171509A - Process control equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce processing time and realize stable periodic processing. SOLUTION: In a process control device including a control arithmetic processing program unit 1 including a user program, a periodic processing program unit 2, an arithmetic subroutine unit 3, and a data memory 4, a control program based on the user program of the user program unit 1 is used. An optimization table 5 is created by grouping and arranging each operation having the same input format and omitting the no-processing operation in the user program.
To execute the control calculation processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process control device, and more particularly, to a process control device characterized by a control operation process of a periodic execution process.

[0002]

2. Description of the Related Art FIG. 1 is a block diagram showing an overall configuration of a conventional process control device. In FIG. 1, the process control device includes a control operation processing program unit 1, a periodic processing program unit 2, an operation subroutine unit 3, a data memory 4, a cell table C _-1 created based on a user program _,. It has a C- ₁₆₀₀ .

In this process control device, a control operation program (higher-order (program) unit 1
On the side, based on the user program set by the user,
With reference to the created cell tables C- ₁ , ..., C- ₁₆₀₀ ,
The input execution data is searched, the type of operation is determined, the operation subroutine is called, and the cell tables C ₋₁ ,..., C ₋₁
Write the operation result to ₆₀₀ . The operation subroutine unit 3 has 39 types such as PID and addition / subtraction including non-processing operation, and each has a different input data format (analog input, digital input).

As shown in FIG. 2, each operation cell has, for example,
Up to 5 inputs I₁~ I_FiveAnd the number of inputs,
Digital or analog depends on the type of operation.
Unique. In here
Force is digital external input D _-ext, Digital communication input
D_-com, Digital internal coupling input D_-inn, Analog external
Input A_-ext, Analog communication input A_-com, And in analog
Partial connection input A_-innThere is. Outside digital and analog
For the module input and communication input, use the data at the beginning of the operation cycle.
Digital and analog internal coupling inputs
The output data of another cell of the period is used (see FIG. 3).
Each of them is stored in the cell table.

In FIG. 1, an arrow indicates a start command at a fixed period, an arrow indicates data reading, an arrow indicates a cell table reference, an arrow indicates a subroutine call, an arrow indicates a result return, and an arrow indicates a cell table. , And the arrow indicates the writing of all results. FIG. 4 shows the operation processing part in more detail. In this control operation processing program, the created cell table is processed in order from 1 to 1600 in the order of the cell numbers of the user program based on the user program as shown in FIGS. Processing for individual cells includes: a. Retrieve actual data from all input data based on input information. b. The operation name is determined from the operation type information.
c. Match the input actual data and parameter actual data to the data format of the operation subroutine. d. Call the arithmetic subroutine, e. Write the result obtained from the operation subroutine to the cell. It goes in order.

Here, a specific example of the control calculation processing will be described with reference to an application shown in FIG. In FIG. 7, among the cells C ₁ ,..., C ₆ , the cell C ₁ is an addition cell having analog external inputs A _−ext 1 and A _−ext 2 as inputs, and the cell C ₂ is an analog communication input A _−. a No. cells to enter the _com 1, cell C ₃ digital communication input D _{-c om}
1, ..., an AND cell which receives the D _-com 5, cell C ₄ digital external inputs D _-ext 1, ..., a OR cell which receives the D _-ext 5, cell C ₅ is AND cell receiving the set input 3 of the output as a digital incoupling input D _-Inn 1, also a FF cell receiving the reset input the output of the OR cell C ₄ as digital incoupling input D _-Inn 2. Cell C ₆ receives the output of summing cell C ₁ as analog internal coupling input A _−inn 1, the output of square root cell C ₂ as analog internal coupling input A _−inn 2, and _receives analog external input A _−ext 1 as input. receiving, in response to an output from the FF cell C _5, received as digital incoupling input D _-Inn 3, a PID cell for PID calculation.

In the processing procedure of the individual arithmetic application in this example, first, input data is searched according to the order of the arithmetic applications and stored in the input table. Since what number input by the type of cells of information is predetermined is a digital or analog, I ₁ to the input cell that information into original, ..., the binding data encoded individually in the order of I ₅ Store the actual data based on the original. In this example, the input table is as shown in FIG. []
Indicates the actual data of the address in []. Next, the second
Next, the processing of the operation cell (subroutine) is sequentially performed based on the actual data of the input table. That is, the first and second processes are performed 1600 times for each cell.

[0008]

As described above, in many cases, when there is a priority in processing, a user program is created for each loop to be controlled in that order. In order to facilitate the processing, non-processing operations are provided in some places. In addition, the maximum number of operations (1
600) is rarely created.
Also in this case, it is processed as a non-processing operation.

[0009] In addition to the above-described control operation processing, the control operation device as a whole transmits and receives data to and from an operator console.
It is necessary to execute communication with the maintenance tool, transfer of input / output data, and actual processing at regular intervals. Processing other than the control calculation processing can be performed in a fixed time, but the calculation processing (processing in the calculation subroutine) increases or decreases the processing time depending on the input data. In the worst case, there is a problem that the user program may not be executed as set in the entire processing time of the predetermined period for the arithmetic processing.

The present invention has been made in view of the above problems, and has as its object to provide a control device capable of reducing processing time and realizing stable periodic processing.

[0011]

A process control apparatus according to the present invention includes a control operation processing program section including a user program, a periodic processing program section, an operation subroutine section, and a data memory. On the basis of this, the input format is grouped and arranged for each operation having the same form, and the no-processing operation in the user program is omitted, and a means for creating an optimization table, and the control operation processing is performed with reference to the optimization table Executing means.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments. FIG. 9 is a block diagram illustrating a configuration of a process control device according to an embodiment of the present invention.
The process control device of this embodiment has a control operation processing program unit 1 similar to the conventional process control device shown in FIG.
, A periodic processing program unit 2 and an operation subroutine unit 3
And a data memory 4. The process control device of this embodiment further includes an optimization table 5.

The optimization table 5 includes, as information, a serial number indicating a processing order, a cell number to be executed, an operation name, and a "group" to which the operation belongs.
Here, the "group" is classified according to the attribute of the input data of each operation subroutine, for example, the analog input only, the digital input only, the analog input and the digital input are mixed.

In the process control device of this embodiment,
If the user program has a processing priority, the processing order follows the priority. However, if there are no priorities, they are rearranged and determined for each group. Further, the order of the "no-processing operation" part included in the user program is determined by omitting this part. Further, the optimization table 5 is created when the user program is updated.

When the optimization table 5 is used, the control operation processing program unit 1 first refers to the optimization table 5 and performs processing for the cell numbers to be executed in the processing order. In each cell, the input data corresponding to FIG. 4A is searched, and the operation name corresponding to FIG. 4B is determined based on each "group". In this case, the number of steps for searching and discriminating is reduced for all data in the conventional case because it is limited by "group" information. The other processing is the same as the conventional processing. Further, when the processing order indicates “end”, the control calculation processing program 1 determines that all the calculation processes in one cycle are completed, and ends the calculation process in that cycle. Since the number indicating the end is determined excluding “no-processing operation”, the maximum number of cells is 160 in many cases.
It becomes smaller than 0.

Here, the process control device of this embodiment
An example of the optimization table is shown in FIG.
An example will be described. In the application in Figure 7
And, for example, AND cell C_ThreeInput is all D_-comOn input
is there. These inputs are used when the arithmetic task shown in FIG.
Just read the data. This AND cell C_ThreeIs the other
Since the result of the cell is not used, processing ends within that cycle.
And PID cell C ₆Even if the processing is done earlier
I just need.

[0017] Therefore, in the AND cell C _3, a new full input adds information is D _-com. This is shown in FIG. That is, when optimizing and compiling the application / program at the time of system initialization, the optimization table and input table of FIG. 7 created by the above group information are as shown in FIGS.

In FIG. 10, an area a is an operation that does not require sequential processing, and an operation in which the types of all inputs are the same as _-com and _-ext. An area b indicates an operation to be sequentially processed. In the application example of the device of this embodiment, when the arithmetic task is started, the optimization table is referred to, and first, seven pieces of real data registered in the group 1 are read. In this case, since all the inputs are D- _com and are registered in order, the area for the group 1 can be read at once without searching for data from the actual data addresses one by one. Subsequently, processing is performed in the order of group 2, group 3,..., No group. The place without a group is the same as the conventional processing. However, since the place registered in the group can be read in a batch, the processing time required for searching for actual input data can be reduced. Further, even if the order of processing is changed, it is within a range that does not affect the entire application.

[0019]

According to the present invention, the control calculation processing program is reset as an optimization table, and the calculation processing is executed based on this optimization table. Is reduced, the entire processing time including the part where the processing time changes according to the input data can be shortened, and more stable periodic processing can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a conventional process control device.

FIG. 2 is a diagram illustrating an input of an operation cell of the process control device.

FIG. 3 is a diagram illustrating a process in a calculation cycle of a process control device.

FIG. 4 is a diagram illustrating a control calculation processing operation in the process control device.

FIG. 5 is a diagram illustrating a user program in the process control device.

FIG. 6 is a diagram illustrating a user program in the process control device.

FIG. 7 is a block diagram illustrating an example of an application control operation process.

FIG. 8 is a diagram illustrating an input table in the process control device.

FIG. 9 is a block diagram illustrating a configuration of a process control device according to an embodiment of the present invention.

FIG. 10 is a diagram showing an example of an optimization table of the process control device of the embodiment.

FIG. 11 is a diagram illustrating an input table of the process control device of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control calculation processing program part 2 Periodic processing program part 3 Calculation subroutine part 4 Data memory 5 Optimization table

Claims (1)

[Claims] 1. A process control device comprising a control operation processing program section including a user program, a periodic processing program section, an operation subroutine section, and a data memory, wherein the input form is based on the user program for each operation having the same input format. It is characterized by comprising means for creating an optimization table by arranging in a group and omitting non-processing operations in the user program, and means for executing control calculation processing with reference to the optimization table. And a process control device.