JPH0322003A - Sequence control system for batch process - Google Patents

Abstract

PURPOSE:To meet tendency for job shop type production without increasing cost by providing a registration table sequence to which the operation of an equipment for each process is registered by the processes, process order file and process selecting means. CONSTITUTION:A registration table sequence 4, to which toe operation of the equipment for each process is registered by the processes, a process order file 1, for which the number of the required process corresponding to a product is defined according to the order of execution, and a process selecting means 3 are provided. Namely, when the first process number is read from the file 1, the process corresponding to this number is executed according to the table sequence 4 by the process selecting means 3. When the execution is finished, the next process number is read from the file 1 and the process corresponding to the number is executed according to the table sequence 4. Then, the product is made by repeating this operation until the final process number. Thus, it is not necessary to prepare the sequence table 4 for each product and a software to the various kinds of the products can be easily prepared. Then, the process for design can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a sequence control method for a batch process that produces products by sequentially executing steps for operating equipment in a predetermined manner in a predetermined order. .

[Conventional technology]

In such a batch process sequence control method,
Conventionally, a sequence table was created that defined the required processes in the required order for each product to be produced, and batch process sequence control for manufacturing the product was realized according to this table. [Problem to be solved by the invention] In recent years, there has been a trend in product production toward multi-product, variable-volume production, but in conventional batch process sequence control, sequence tables are created for the number of types of products to be produced. It is necessary to prepare Therefore, in order to quickly respond to high-mix, variable-volume production, it is necessary to increase the number of sequence tables, and since there is a limit to the number of sequence tables that can be installed on one controller, the number of controllers itself must be increased. This has led to the problem of increased costs for batch process sequence control.

An object of the present invention is to solve the problems associated with the prior art, and to implement a batch process sequence that can immediately respond to the trend of high-mix, variable-volume production without increasing the number of controllers, that is, without increasing costs. The objective is to provide a control method.

[Means to solve the problem]

To achieve the above object, the present invention provides a sequence control system for a batch process in which a product is produced by sequentially executing steps in which equipment operates in a predetermined manner in a predetermined order, in which the operation of the equipment in each step is The present invention includes a registration table sequence that is registered separately, a process order file in which required process numbers corresponding to products are defined according to their execution order, and a process selection means.

[Operation] When the process selection means reads the first process number from the file, it causes the table sequence to execute the process corresponding to the number, and when it is completed, reads the next process number from the file and selects the number. A product is manufactured by causing the table sequence to execute a process corresponding to , and then repeating this process up to the last process number.

Since it is only necessary to define a process order file for each product, the number of sequence tables will not increase and costs will not increase.

〔Example〕

FIG. 1 is an explanatory diagram showing one embodiment of the present invention. In the same figure, the controller K has a process order file (PF)
1, a process selection means 3, and a registration table sequence 4, and 5 is an execution sequence chart.

Process order file (PF) 1 is a single file numbered from 1 to 32 in the illustrated example, and the process numbers are written in that order using a loader (not shown) in correspondence with the product to be produced. It looks like this. In the illustrated example, the first step is step number 1, the second step is step number 6, the third step is step number 2, the fourth step is step number 6, the fifth step is step number 8, etc.・ is written.

The process selection means 3 is controlled by a process progress command means 31, an AND gate 32, and a selection switch 33. The selection switch 33 is configured to select and read out the process numbers defined in the process order file (PF) 1 in order. Registration table sequence 4 includes:
In the illustrated example, processes with process numbers 1 to 8 are registered.
The process numbered 1 is a standby process, and is a process of outputting logical O (off) outputs to the outputs SCV-1 to SCV-4, PU-1, PU-2, and AC-1, respectively.

Here, SCv refers to the valve in the manufacturing process, P
Although U represents a bomb and AC represents an agitator, it goes without saying that these elements can be replaced with various other elements depending on the process.

The process numbered 2 is a temperature raising process, and the output scV-1 and A
Logic 1 (on) is output to G-1, and outputs SCV-2 to SCV-1=, PU-1, PU-1:,
This is the process of outputting a logic o (off) output for each of them.

In registration table sequence 4, hatched columns represent logic 1 (on) and blank columns represent logic O (off).
It represents. Process number 3 (cooling), process number 4 (pressurization), process number 5 (depressurization), process number 6 (input), process number 7 (analysis), process number 8 (discharge), It will be appreciated that each is defined with a logic 1 (on) and logic O (off) output data.

Next, the circuit operation will be explained. First, the selection switch 33 selects the first process order file l.

Therefore, since the process number 1 defined there is read out, the process progress command means 31 instructs the registration table sequence 4 to execute the process with number l.

In response, the registration table sequence 4 executes the step (standby) with number l (i.e., outputs SCV-1 to SC
V-4, PU-1, PU-2, and AC-1 each output a logic 0 (off) output). When this is completed, the registration table sequence 4 outputs a process completion signal, advances the selection switch 33, and selects the second process order file 1.

At the same time, the process completion signal sends a command to enable operation to the process progress command means 31 unless OFF is given as a progress condition command to the AND gate 32 (off is given as a progress condition command to temporarily stop the operation. ).

Since the process number 6 defined second in the process file 1 is read out, the process progress command means 31 sets the registration table sequence 4 to execute the process with number 6.
command.

Registration table sequence 4 then executes step number 6 (input) (i.e. outputs logic 1 (ON) on output PtJ-1 and logic 0 (OFF) on all other outputs). When this is completed, the registration table sequence 4 outputs a process completion signal and advances the selection switch 33 to select the third item in the process order file 1. Thereafter, the registration table sequence 4 similarly executes all the steps defined in the step order file 1, thus completing one batch process.

The execution sequence chart 5 thus represents the steps executed by the registration table sequence 4 in one batch process.

〔Effect of the invention〕

As explained above, according to the present invention, once one registration table sequence is created and stored in the controller, all that is required is to define the required processes in the process sequence file for each product, unlike the conventional method. It is advantageous that there is no need to prepare a sequence table for each product, software for a wide variety of products can be easily created, and design man-hours can be shortened.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention. Explanation of symbols 1...Process sequence file, 3...Process selection means, 4
...Registration table sequence, 5...Execution sequence chart

Claims (1)

[Claims] 1) In a sequence control method for a batch process in which a product is produced by sequentially executing steps in a predetermined order in which equipment operates in a predetermined manner, the operation of the equipment for each step is registered for each step. A registration table sequence that has a registered table sequence, a process order file in which the numbers of required processes corresponding to the product are defined according to their execution order, and when the first process number is read from the file, the process corresponding to the number is registered in the table sequence. and upon completion of the process, reads the next process number from the file, causes the table sequence to execute the process corresponding to the number, and repeats this process up to the last process number. A sequence control method for batch processes characterized by: