JP3494215B2 - Program control unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program control device suitable for programming a sequencer or the like, which can precisely control the operating state of each step in a step-by-step processing apparatus while clearly grasping the operating state. Regarding

[0002]

2. Related Background Art In various production plants, power plants, and water treatment plants, step-by-step type treatment devices are frequently used. For example, the deionized water production equipment in water treatment equipment is also a step-by-step type treatment equipment, and in water sampling treatment, "stop",
It is configured to sequentially execute processing steps such as “circulation”, “water sampling”, and “calming”. By the way, the above processing steps are
The processes are divided and managed so that a series of processes can be easily automated and the operation mode of the processing device can be clearly understood. Then, the processing operation is controlled for each process division by using a sequencer or the like.

By the way, in the case of constructing a control device (for example, a processing procedure by a sequencer) of the above-mentioned process step type processing device, generally, as a pre-preparation, for example, a process chart using a program chart as shown in FIG. 6 is used. It describes the rules of progression and the operation contents of the device in each process. Then, after confirming the validity of the contents described in the program chart on the desk, programming is performed for the sequencer which is the control device.

[0004]

However, in the sequencer, since the process step rule and the contents of the control output to the processing device are described by using a dedicated software language such as a so-called ladder diagram, a specialized technique is required. Besides, it requires a considerable amount of time and effort to program it. In addition, when the processing device is modified or the processing form is changed, it is necessary to modify the form of control by the sequencer using a programming editing tool. Therefore, there is a problem that it is difficult to promptly deal with the design change.

On the other hand, Japanese Patent Publication No. 1-19170 discloses a method of executing a program for a sequencer by inputting the contents of the program chart as it is. However, in this method, it is necessary to describe the pattern of the control output for each output terminal of the sequencer, which may cause considerable difficulty when the controlled object constitutes a large-scale system. can not deny. Moreover, the program chart itself is complicated, which makes it difficult to understand its contents.

The present invention has been made in consideration of such circumstances, and an object thereof is to reduce the amount of program description in a software language for a sequencer and to facilitate the editing of its control contents. It is an object of the present invention to provide a program control device having excellent handleability, which is suitable for use in controlling a step process type processing device.

[0007]

In order to achieve the above-mentioned object, a program control apparatus according to the present invention is used for programming a sequencer or the like for controlling the operation of a step step type processing apparatus that sequentially executes a plurality of processing steps. Suitable one,
A control signal to be output from the sequencer to the operating mode of one or more devices in each of the processing steps, specifically, to the devices (auxiliaries) such as the open / close valves and pumps that configure the step-step processing device. An output pattern table that has been patterned in advance and stored for each processing step, information on the step transfer destination that specifies the processing step to be executed next for each processing step, and the step transfer conditions (transition to the next processing step) A transition condition table storing conditions for identifying the operating state of the equipment), and a process information memory storing process information (process number, etc.) identifying each processing process.

[0008] Then, in the step transition process, the outer
The information given by the department depends on the operating status of each device.
Input process to convert to input pattern consisting of data string
According to the process information stored in the process information memory, the process transition destination and the process transition condition of the corresponding process process are obtained from the transition condition table, and the operating state of one or more devices in the corresponding process process is determined. the match input <br/> force pattern and the step transition condition, updates the process information stored in the process information memory in accordance with the comparison result, whereas, in the pattern output process, the process information memory shown The output pattern of the corresponding processing step is obtained from the output pattern table according to the step information stored in the step pattern, and in the output process, the output signal (control output ) Is generated.

[0009] Preferably the program control device according to the present invention, for the pre-SL output pattern table and the transition condition table as described in claim 1, providing editable its contents via a predetermined operating device Is preferred. As described in claim 3 , the process information memory is initially set with process information for specifying the first processing process. That is, the program control device according to the present invention is
According to the process information for specifying the process step stored in the process information memory from the output pattern table in which the operating mode (control signal to be output from the sequencer) of one or more devices in each process step is patterned and stored in advance. A control signal to be output in the processing step is obtained. On the other hand, according to the process information stored in the process information memory, a transition condition table that describes in advance a processing process to be executed next for each processing process and its process transition condition is referred to, and the process steps in the processing process are referred to. A control signal to be output in the next process step from the output pattern table described above by rewriting the process information memory by obtaining the process step to be executed next as the transfer destination according to the operating state of the progressive processing apparatus. It is characterized by having to seek.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A program control device according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a program control device according to this embodiment, and 1 is a step process type processing device as a control target by the program control device. This process step type processing apparatus 1 is, for example, a "sludge pump", a "defoaming agent injection pump",
From a water treatment device equipped with control target equipment (auxiliary equipment) such as "bio circulation pump", "sludge discharge valve", "sulfuric acid injection valve", "caustic soda injection valve", "ozone generator", "bio operation" Become. This water treatment device (process stepwise treatment device) 1 is, for example, “preparation”, “reception”, “reaction”, “PH”.
"Adjustment", "PHCH", "Defoaming injection", "Defoaming", "Discharging"
It is configured to sequentially execute a series of processing steps such as.

[0011] Thus a program control equipment which controls the operation of the above-described water treatment device (step progression type processing apparatus) 1
Is configured to include a control unit 2 which is its main body, an editing unit 3 including a personal computer (PC) and an input / output unit 4 such as a touch operation panel. The control unit 2 has a process number memory 21 for storing process numbers (process information) for specifying a plurality of treatment processes which are sequentially executed in the water treatment device 1 as shown in FIG. An operation pattern of the water treatment apparatus 1 in each treatment step, specifically, an output pattern in which a plurality of control signals to be output to the above-described controlled equipment of the water treatment apparatus 1 are patterned and described in advance. A table 22 is provided. Further control unit 2
Includes a transition condition table 23 in which information of a process transfer destination that specifies a processing process to be executed next to each processing process and its transfer condition are described. The process transition conditions described in the transition condition table 23 are a plurality of states that respectively indicate the operating state of the water treatment device 1 in the treatment process, specifically, the operating state of the control target equipment of the water treatment device 1 described above. The signal (sensing signal) is given by patterning it in advance.

Such a data memory (process number memory 21, output pattern table 22, transition condition table 2)
In addition to 3), the control unit 2 includes a program memory in which a program for executing a predetermined processing function is described. The processing function executed by this program is a pattern output process 24 for obtaining the output pattern of the corresponding processing step from the output pattern table 22 according to the step number stored in the step number memory 21, and the water treatment according to this output pattern. It has an output process 25 for generating a plurality of control signals to be output to one or more controlled devices of the device 1.

Another processing function executed by the above program is to obtain the above-mentioned process transfer destination information and its transfer condition from the process transition table 23 in accordance with the process number stored in the process number memory 21, and perform the water treatment. Device 1
From the process transition process 26 that determines whether or not to advance the treatment process in the water treatment device 1 by collating a plurality of state signals (sensing signals) each indicating the operating state of the control target device with the above transition condition. Become. Then, in the process transition process 26, when the condition to move to the next processing process is satisfied, the contents stored in the process number memory 21 are rewritten with the information of the process transfer destination, so that the next processing process is performed. It is supposed to proceed to.

As for the operation state signal (sensing signal) of the controlled device given to the process transition process 26, the state signal (patterned and described in the transition condition table 23 described above using the external input process 27 ( It is desirable to convert it into an input pattern of the sensing signal and capture it. Also, the output pattern table 2 described above
The output pattern and an input pattern that describes the 2 and transition condition table 23, Re et supplied from the input-output unit (touch operation panel) 4 by starting the editing process 28
It is desirable to configure to be able to appropriately modify (modification) according to the information.

A program control processing procedure for the stepwise processing steps executed in the control unit 2 will be described. The step number memory 21 is initially set with a step number that specifies the processing step to be executed first in the stepwise processing step, specifically, a step number that specifies the "standby" mode. Then, as shown in FIG. 3 as a schematic processing procedure of the process transition process 26,
In the process transition process 26 , first, the process number "01;standby" stored therein is read from the process number memory 21 [step S1]. Then, the transition condition table 23 is searched according to this process number, and the process migration destination described in advance in the item specified by the process number (information specifying the processing process to be executed next to this processing process; the next process) No.) T and process transition conditions for transition to the processing process [step S
2]. This process transition condition specifies the state that the controlled object device in the water treatment device (process stepwise treatment device) 1 can take in the treatment process, and the signal state D that specifies the state of the controlled device. And <AND> and <O
R> and other transitional conditional expressions J represented by logical expressions. The signal state D and the actual input state DN of the control target device described later indicate its on / off state [1 /
It is given as data of 0] or a data string (pattern) of [1/0].

By the way, when the transitional conditional expression J is <AND>, it means that each of the plurality of states of the control target equipment obtained from the water treatment device (process stepwise treatment device) 1 is the signal state D. , The transition condition will be specified. When the transition condition expression J is <OR>, one of the plurality of states of the control target device obtained from the water treatment device (process stepwise treatment device) 1 satisfies the signal state D, and Transition conditions are specified.

Therefore, in the process transition process 26, it is next determined whether or not the conditional expression is <AND> [step S3], and if it is <AND>, the water treatment device (process stepwise process) is performed. From the device 1), a plurality of input states DN of the controlled device at that time are obtained. And these input <br/> force state DN and the signal state D respectively <the AND> process, further the <the AND> processing result step transition condition D to DN1 by subtracting the state D or <br/> et al Data DN2 for determining whether or not is satisfied is obtained [step S4]. Then, by determining whether or not the data DN2 is <0> (DN2 = 0?), It is determined whether or not the process transition condition is satisfied [step S5].

On the contrary, when the conditional expression is not <AND>, in the process transition process 26, the input state DN and the signal state D of the control target device obtained from the water treatment device (process stepwise treatment device) 1 are obtained. <XNO
R> , this < XNOR > processing result DN1 is directly used as data DN2 for determining whether or not the process transition condition is satisfied [step S6]. And the above data DN
Whether 2 (= DN1) is not <0> (DN2 ≠ 0?)
By determining the above, it is determined whether or not the process transition condition is satisfied [step S7].

When it is determined that the process transition condition is satisfied as described above, the content of the process number memory 21 is rewritten using the process transition destination T obtained as described above [step S8]. , The process ends. If the above process transition condition is not satisfied,
It is determined that the water treatment device (process stepwise treatment device) 1 is not executing the treatment process or has not reached the operating state to move to the next process, and the contents of the process number memory 21 are not rewritten. The process ends. Then, the process from the reading of the process number from the process number memory 21 is repeated again.

On the other hand, the pattern output process 24 is as shown in FIG.
Then, the process number is read from the process number memory 21 as shown in the schematic processing procedure [step S11]. Then, the output pattern table 22 is searched according to the process number, and the corresponding output pattern is read from the output pattern table 22 [step S12]. As described above, this output pattern is made up of information that specifies the operating mode of each device to be controlled in the water treatment device (process stepwise treatment device) 1 in the treatment process. Based on such an output pattern, an output signal (control signal) is generated to be given to the water treatment device 1, and is output through the above-mentioned output process 25 [step S13].

That is, in the pattern output process 24, the information of the patterned operating mode for each processing step described in the output pattern table 22 in advance is selectively selected according to the process number written in the process number memory 21. It is reading. Then, by generating a control signal to be given to the water treatment device 1 in accordance with the information on the operating mode, the control target device is turned on / off to operate in the treatment process.
It is supposed to control off.

Thus, according to the program control device configured as described above, the operation mode (which device is started up in a plurality of treatment processes stepwise executed in the water treatment device (process stepwise treatment device) 1) Information on whether or not to stop) is programmed in the output pattern table 22 in advance, and an output pattern for obtaining a control signal required for the process from the output pattern table 22 according to the process number written in the process number memory 21. So that
It is possible to reliably control the operation of the water treatment device (process step type treatment device) 1. Moreover, the transition condition according to the process number
The table 23 is searched to find the transition condition to the next process , and while advancing the process number to the process of the transfer destination while judging whether or not the operating state of the current processing process satisfies the process transition condition, Since the contents of the number memory 21 are rewritten, a plurality of processing steps can be sequentially and surely executed step by step.

Further, with the above-mentioned configuration, the control mode for the water treatment device (process stepwise treatment device) 1 in each treatment process is described as a data string (pattern) of [1/0] as described above. Since it is only necessary to do so, the program description amount can be small. In particular, compared to the ladder type program description form that has been widely used in the past,
The amount of data can be significantly reduced. Moreover, regarding the correction, the corresponding part in the output pattern is [1 /
0], it is only necessary to change the data, and the processing is easy.

Further, a water treatment device (process step type treatment device)
The status signal (sensing signal) obtained from 1 is also converted into a data string (pattern) of [1/0] through the external input process 27 and handled, thereby facilitating the processing. Is played. Regarding the patterning of the status signal and the control signal, for example, the item corresponding to each device on the program chart shown in FIG. 6 becomes [1] in the operating state and [0] in the stopped (non-operating) state. Data (information) may be given and these [1/0] data may be patterned as a data string arranged in the column direction.

Further, the output pattern table 22 and transition
Regarding the contents (output patterns and process transition conditions) described in the transfer condition table 23, the process is set and its transition conditions are set by using the editing unit 3 having a predetermined editing program, and the operation of each process is performed. The output pattern may be set according to the form (opening / closing of various control valves and starting / stopping of equipment). In particular, as shown in FIG. 6, using a program chart in which process numbers are arranged on the abscissa and device names and their control numbers are arranged on the ordinate, the intersections are used as information for specifying the devices to be operated in each processing step. if so go denoted by the pointer, as the output pattern table 22 and transitions the description of the program chart
Since the contents can be described in the condition table 23, it is possible to achieve the effect that the programming itself for the control unit 2 such as a sequencer can be facilitated.

Further, in the case of performing programming in this way, when managing the operation of the apparatus, for example, a screen as shown in FIG. 5 is displayed on the touch operation panel constituting the input / output unit 4 described above. Is desirable. Briefly described the display screen, A is shows the name of the currently executing process, B denotes the name of the process to be executed next. In addition, C indicates the operating state of the device, "RUN" during operation, "STO" during stop.
The display "P" is made. D is a soft switch used to change the execution step (processing step), E is a soft switch for monitoring step information, and D is a soft switch for monitoring the current IN / OUT state of the device. is there.

By using the display screen of the input / output unit 4 as described above to manage the operating state of the input / output unit 4, it is possible to improve the man-machine interface property and to improve the handleability. It is possible to realize a different program control device. The present invention is not limited to the above embodiment. For example, it goes without saying that the step process type treatment apparatus is not limited to the water treatment apparatus. The number of processing steps to be managed may be set according to the specifications. The editing unit 3 may be selectively connectable to the control unit 2, and may be connected to the control unit 2 only when setting or changing the control content. In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.

[0028]

As described above, according to the present invention, the output pattern table in which the information for specifying the operating mode of the plurality of processing steps is patterned and stored, and the process transition in which the transition conditions of the plurality of processing steps are described. With a table, the control signals necessary for each processing step are obtained from the output pattern table while the processing steps are sequentially advanced according to the process information for specifying the processing step, so that the operation of the stepwise processing apparatus can be ensured. Can be controlled. Moreover, not only the programming but also the effect that the processing content can be easily changed or modified can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a program control device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing functions of a control unit in the program control device shown in FIG.

FIG. 3 is a diagram showing a schematic processing procedure of a process transition process.

FIG. 4 is a diagram showing a schematic processing procedure of a pattern output process.

FIG. 5 is a diagram showing an example of a display screen in the input / output unit.

FIG. 6 is a diagram showing an example of a program chart for describing process step rules in the stepwise processing apparatus and operation contents of the apparatus in each step.

[Explanation of symbols]

1-step stepwise treatment equipment (water treatment equipment) 2 control unit 3 editorial department 4 Input / output section (touch panel) 21 Process number memory 22 Output pattern table 23 Transition condition table 24 pattern output process 25 Output process 26 Process transition process 27 External input process 28 Editing process

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G05B 19/05

Claims (3)

(57) [Claims] 1. A program control apparatus for controlling the operation of a step-progressive type processing apparatus that sequentially executes a plurality of processing steps, wherein the operating mode of one or a plurality of devices in each of the processing steps is patterned and An output pattern table stored for each processing step, a transition condition table storing a step transfer destination that specifies the processing step to be executed next for each processing step, and the step transfer conditions, and each processing step A process information memory for storing process information to be specified, and information provided from the outside according to the operating state of each device.
Input process that converts to an input pattern consisting of
Graphics and, together with the finding and a step transition destinations and step shift condition processing steps corresponding from the transition condition table according to process information stored in the process information memory, the one or more devices in the corresponding processing step Health the collating an input pattern and the step transition conditions shown, the according to the a step transition process of updating process information stored in the process information memory, process information stored in the process information memory in response to the comparison result A pattern output process for obtaining an output pattern of a corresponding process step from the output pattern table; and an output process for generating an output signal to the step step type processing device according to the output pattern obtained from the pattern output process. Characterized program control device. 2. The program control device according to claim 1, wherein the output pattern table and the transition condition table are provided such that their contents can be edited via a predetermined operation device. 3. The program control device according to claim 1, wherein the process information memory is initially set with process information for specifying a first processing process.