JP2938246B2 - Behavioral description programmable 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 programmable controller for controlling, for example, equipment of a plant to be controlled, and more particularly to a programmable controller capable of immediately leading and outputting a control output corresponding to a state change of a plant to be controlled. The present invention relates to an operation description type programmable controller.

[0002]

2. Description of the Related Art Recently, in various plants, programmable controllers for controlling plant equipment and the like are often used. Normally, the programmable controller of this type are stored-program method, is performed by using a tool such as a graphics programmer, as if creating a hard-wired sequence circuit, for example, a program designed as shown in FIG. 8 .
8A and 8B are ladder diagrams of different expressions showing the same operation.

However, users who are unfamiliar with the sequence not only take a lot of time to design the program, but also construct a complicated sequence program, which often hinders the debug maintenance of the program. Have occurred.

That is, in the above-described sequence program, the method for operating the control target according to the specification (constant operation determined in the specification) is not uniquely determined, but is determined by various sequence programs. It can be realized and does not correspond one-to-one with the operation of the plant. Therefore, users unfamiliar with sequences tend to create increasingly complex sequence programs.

[0005]

As described above, in the conventional programmable controller, the operation of the plant to be controlled cannot be made to correspond one-to-one with the program, and it is difficult to design the program. There was a problem.

An object of the present invention is to uniquely determine the operation of a plant to be controlled and a program to easily design a program, and to immediately output a control output corresponding to a state change of a plant to be controlled. An object of the present invention is to provide an extremely reliable operation description type programmable controller capable of outputting.

[0007]

In order to achieve the above object, the present invention provides an input means for inputting state data of a plant to be controlled at a constant cycle, state data and control output data of a plant to be controlled. is divided into pre-designed time chart several steps shows the operation of the control target plant, expressed in association with bets, is converted into a data table format consisting of a state of the state change and plant following the state change of the plant Program data entered
Data storage for storing data and input processing
A storage unit having a data storage unit and an input process are performed on the state data input by the input unit, and by comparing the previous state data and the current state data, state change data is obtained for state data having a state change, and For the status data having no status change, the input processing function of storing the current status data in the input processing data storage unit of the storage means as the input processing data, the input processing data and the program stored in the input processing data storage unit A pattern check processing function that compares all the steps of the program data stored in the data storage unit and extracts a matched step, and outputs control output data specified in the next step following the extracted step to the program data Arithmetic processing means having a control output processing function for extracting from a storage part, and arithmetic processing means A control output corresponding to a more extracted control output data constitutes an output means for outputting to the control object.

[0008]

Therefore, in the operation description type programmable controller of the present invention, the status data input from the input means is input, the previous status data is compared with the current status data, and the status data having a status change is determined. As for the state data in which the state change data has not been changed, the current state data is stored in the storage means as input processing data. Next, the input process data stored in the storage means is compared with the program data stored in advance, and if there is a matching step, the next step following the step is defined. The control output data is extracted from the storage means. Then, the control output corresponding to the extracted control output data is output to the control target, so that the control output corresponding to the state change of the plant to be controlled can be output immediately.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the concept of the present invention will be described.

In general, the tasks performed by designers to control a controlled object are to capture the movement of the controlled object and changes in various states leading to the movement. A method that can briefly describe this state is a time chart that describes the state in chronological order. Therefore, in the present invention, this time chart is composed of changes in various states and states (statuses) of the control target following the state changes, and the states on the time chart correspond to the state changes and the state changes . To the controlled object
The command and the state of the control target corresponding to the command are stored in the controller and can be referred to at any time.

As described above, the various states input to the controller are checked for each input / output scan to detect a change in the state, and the changed state is compared with the state change data stored in the controller. As a result, when a state change is matched, according to the data shape from the data unit variable matches
In response to a command to the controlled object, the state of the controlled object is shifted to a subsequent state to control the controlled object. Hereinafter, an embodiment of the present invention based on the above concept will be described in detail with reference to the drawings.

FIG. 1 is a functional block diagram showing a configuration example of an operation description type programmable controller according to the present invention. As shown in FIG. 1, an operation description type programmable controller according to the present embodiment includes an input unit 1, a programming tool 2 as a program creation unit, a storage unit 3,
It comprises arithmetic processing means 4, output means 5, and control means 6. Here, the input means 1 is for inputting state data of a plant to be controlled, which will be described later, at a constant cycle based on a timing signal from the control means 6.

Further, the programming tool 2 divides the time chart showing the operation of the plant to be controlled, which shows the state data of the plant to be controlled and the control output data in association with each other, into a plurality of steps, This is created as program data in a data table format including the state of the plant following the state change.

Further, the storage means 3 has an input processing data storage section and a program data storage section for storing program data created by the programming tool 2.

On the other hand, the arithmetic processing means 4 performs an input process on the state data input by the input means 1 and compares the previous state data with the current state data to determine the state data having a state change. And an input processing function for storing the current state data in the input processing data storage section of the storage means 3 as input processing data for the state data in which the state has not changed, the input processing stored in the input processing data storage section. A pattern check processing function for comparing the process data with all the steps of the program data stored in the program data storage unit and extracting a matched step, and a control output defined in the next step following the extracted step It has a control output processing function of extracting data from the program data storage unit. The output unit 5 outputs a control output corresponding to the control output data extracted by the arithmetic processing unit 4 to a control target. Further, the control means 6
Generates a timing signal for synchronizing the input means 1, the storage means 3, the arithmetic processing means 4, and the output means 5.

Next, data input from the programming tool 2 and a configuration example of the format of the data on the storage means 3 will be described with reference to a plant having specifications as shown in FIGS. 2 and 3 as an example.

In FIG. 2, a system for sending water from a lower tank 8 to an upper tank 9 by a pump 7 (a plant to be controlled)
The driving motor 10 of the pump 7 is provided with a contactor (8
8) Control is performed by turning on / off 11. The control contents of the contactor (88) 11, that is, the pump 7, include, for example, the water level L of the upper tank 9 or lower (33
W2L), the operation is stopped (OFF) when the water level is higher than H (33W2H), and the emergency stop is performed when the water level is lower than LL (33W1LL) in the lower tank 8 on the suction side. By defining such conditions (specifications imposed on the plant), the signals 33W2H, 33W2L, 33W1LL and the contactor (8
8) In the time chart relating to 11, the horizontal axis can be described as time, as shown in FIG. The time chart is in one-to-one correspondence with the required operation of the equipment of the plant to be controlled (specification imposed on the plant).

On the other hand, the programming tool 2 inputs the above-described time chart. First, the time chart is divided. Since this time chart shows a state change and a state following the state change, handling is easy if it is divided into a state change part and a state part following the state change part. The result of such processing is shown in the upper part of FIG. Here, the pickup (P) and the change from ON to O in which the configuration change is changed from OFF to ON.
If the change to FF is expressed as dropout (D), the ON state is expressed as (1), and the OFF state is expressed as (0), the divided time chart can be converted into a data table as shown in the lower part of FIG. Then, the converted data table is loaded into the storage means 3 in the controller by the programming tool 2 as it is. Next, the operation of the operation description type programmable controller of the present embodiment configured as described above will be described with reference to FIGS.

First, the state data is input from the input means 1, input processed in the arithmetic processing means 4, and stored in the input processing data storage section of the storage means 3. That is, in the input processing unit in the arithmetic processing means 4, for each state data,
Processing is performed on three types of data, “OLD”, “NEW”, and “state change”. First, state data is read at the timing of scanning by the controller, and is treated as "NEW" data. Then, by comparing the “NEW” data with the “OLD” data, a state change is detected. In the example of FIG.
This shows a case where the data of W2L is newly turned ON. {“OLD” XOR “NEW”} AND “NEW” → 1
Then, it is detected that the P (pickup), that is, the 33W2L signal has entered the P pickup state (change of state). Then, the shape change data is stored in the “state change portion”.

Next, the "OLD" data is updated to "NE".
After the data is replaced with the “W” data, the data that has not changed state (33W1LL, 33W2H in this example) is written with “NEW” data in the “state change section”, and is finally The input processing data is transferred to the input processing data storage unit as input processing data.The arithmetic processing unit 4 checks the comparison pattern between the input processing data and the program data by a method as shown in FIG. Done.

That is, the above-mentioned input processing data and all steps of the program data (data converted from the time chart) are compared, and as a result, the steps which match are extracted. In this example, the state change data is 33W1LL
Since "O", 33W2L "P" and 32W2H "O", the step 1 state having the same value on the program data corresponds to this. Next, a control output process for giving an output to a control target using the data subjected to the pattern check process is performed by a method as shown in FIG.

That is, the process proceeds to a step (step 2 in this example) subsequent to the step (step 1 in this example) obtained by the above-described comparison pattern check processing (transition of steps). The data of the control output section is extracted from the program data section of the storage means 3. Then, a control output signal based on the extracted control output data is output from the output means 5 to the control target. In this example, the state is changed to the next step 2,
The control output data “P” of the contactor (88) 11 located here is extracted, and the control output signal based on this “P” data is changed from OFF to ON.

As described above, the operation description type programmable controller according to the present embodiment includes the input means 1 for inputting the state data of the plant to be controlled at a constant period by the timing signal from the control means 6, A data table that divides a time chart showing the operation of the plant to be controlled, which shows the state data of the plant and the control output data in association with each other, into a plurality of steps, and includes a state change of the plant and a state of the plant following the state change Storage means 3 having a programming tool 2 for creating program data in a format, an input processing data storage section, and a program data storage section for storing the program data created by the programming tool 2, and a state inputted by the input means 1 Performs input processing on the data and By comparing the current state data with the current state data, the state change data for the state data having the state change and the current state data for the state data having no state change are input to the storage means 3 as input processing data. The input processing function stored in the processing data storage unit, the input processing data stored in the input processing data storage unit is compared with all the steps of the program data stored in the program data storage unit, and the matched step is extracted. An arithmetic processing means 4 having a pattern check processing function and a control output processing function of extracting control output data defined in the next step following the extracted step from the program data storage unit; Output means 5 for outputting a control output corresponding to the control output data to the control target. In which was to so that. Therefore, the following various effects can be obtained.

(A) Since a data table obtained by modifying a time chart describing the operation of the plant to be controlled is used as the control program, if the operation specifications of the plant are determined, it is possible to correspond one-to-one with the operation of the plant equipment. A program can be created very easily.

(B) The data table obtained by modifying the time chart is divided into a state change of the plant and a state (status) following the state change, and is closely associated with the coupling. The corresponding control output can be immediately derived, and the maintenance of the program data is extremely excellent.

(C) Since the program is a program data table system in which the time chart is modified, it is only necessary to change, add, or correct the data on the data table when changing the plant control mode. Note that the present invention is not limited to the above embodiment, but can be implemented as follows.

[0027] In the above embodiments, for example, by Rukoto to omit time chart reading function from the programming tool 2, designers state change followed by a state (status)
May be input .

[0028]

As described above, according to the present invention, the operation of the plant to be controlled and the program can be uniquely determined to easily design the program, and the state change of the plant to be controlled can be easily achieved. An extremely reliable operation description type programmable controller capable of immediately outputting a control output corresponding to the above can be provided.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of an operation description type programmable controller according to the present invention.

FIG. 2 is a schematic diagram showing an example of a virtual plant model for explaining the embodiment and its operation specifications.

FIG. 3 is a time chart for explaining the embodiment.

FIG. 4 is a correlation diagram showing an example of a time chart, a division method thereof, and program data in the embodiment.

FIG. 5 is an exemplary view for explaining an input processing method in the embodiment.

FIG. 6 is an exemplary view for explaining a pattern check processing method in the embodiment.

FIG. 7 is an exemplary view for explaining a control output processing method in the embodiment.

FIG. 8 is a diagram showing an example of a conventional ladder diagram program.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Input means, 2 ... Programming tool, 3 ... Storage means, 4 ... Operation processing means, 5 ... Output means, 6 ... Control means,
7: pump, 8: lower tank, 9: upper tank, 10: electric motor, 11
... contactor (88), 12 ... input processing unit, 13 ... input processing data storage unit.

Claims (1)

(57) [Claims] 1. An input means for inputting state data of a plant to be controlled at a constant period, and an operation of the plant to be controlled, wherein the state data of the plant to be controlled is associated with control output data. The previously designed time chart is divided into a plurality of steps, and the time chart is converted into a data table format including a state change of the plant and a state of the plant following the state change.
Program data storage unit for storing program data entered is conversion, and storage means having the input processing data storage unit performs the input processing for the state data input by the input means, the previous state data and the current state As a result of comparison with the data, the status data having the status change is the status change data, the status data having no status change is the current status data, and the input process data storage section of the storage means is the input process data. Input processing function,
A pattern check processing function for comparing the input process data stored in the input process data storage unit with all the steps of the program data stored in the program data storage unit, and extracting a matched step; An arithmetic processing unit having a control output processing function of extracting control output data defined in the next step following the step performed from the program data storage unit, and corresponding to the control output data extracted by the arithmetic processing unit. An operation description type programmable controller, comprising: output means for outputting a control output to the control target.