JP4562141B2 - Programmable logic controller, information processing apparatus, control program, and table creation program - Google Patents

Description

  The present invention relates to a programmable logic controller, an information processing device, a control program, and a table creation program. For example, the present invention relates to control using a programmable display whose screen arrangement can be arbitrarily set.

2. Description of the Related Art Programmable logic controllers (hereinafter referred to as PLCs) are used in a wide range of fields as FA (factory automation) control devices that control production facilities and the like.
The PLC is a device that takes in an input signal from an input device such as a sensor or a mechanical switch, and freely controls an output device such as a solenoid valve or a motor based on preprogrammed conditions.
The PLC is configured to directly execute a source program (hereinafter referred to as a ladder program) written in a dedicated ladder program language.

In recent years, a programmable display having a man-machine interface function capable of controlling a machine or the like on the same screen while viewing information displayed on the screen has been widely used as such a PLC input / output device.
The programmable display device is a display device that can freely change the screen arrangement and operation by setting, and a typical one includes a touch panel display.
The operation control of the programmable display device used by being connected to the PLC is also performed by executing a ladder program.

The ladder program is based on a sequence diagram, and the contents thereof are described by combining instruction words expressed by symbol (symbol) display and device information.
As described above, since the ladder program is a language described using dedicated symbols, the creation of the program requires specialized knowledge and requires time-consuming work.
Therefore, conventionally, techniques for supporting the creation of ladder programs and reducing the burden on workers have been proposed in the following patent documents.
JP-A-10-161713

  In Patent Document 1, a condition for controlling (driving) a controlled object (output device) is defined by creating a condition table indicating elements and state conditions of the elements. A technique for generating a ladder sequence program based on this has been proposed.

  When there is a change in the setting contents of the object displayed on the programmable display connected to the PLC, the ladder program must be recreated using the creation tool as described above. For this reason, it takes time for the contents of the change to be reflected in the PLC.

Therefore, a first object of the present invention is to provide a programmable logic controller and a control program that can easily reflect changes in the setting contents of an object displayed on a programmable display.
It is a second object of the present invention to provide an information processing apparatus and a table creation program capable of generating a reference table for easily reflecting a change in setting contents of a programmable display on a PLC.

In the first aspect of the invention, there is provided a programmable display capable of performing sequence control by sequentially executing a program indicating control contents based on a signal input from a connected device and arbitrarily setting a screen arrangement. A programmable logic controller to be connected, which obtains a reference table in which an object displayed on the programmable display is associated with an operation process assigned to the object and an operation condition that enables execution of the operation process A reference table obtaining unit, an object specifying unit for specifying an object, an operation process specifying unit for specifying an operation process corresponding to the object specified by the object specifying unit based on the reference table, and the operation process specifying unit The action process specified by Whether to satisfy the operating conditions that permit the line is determined based on the reference table, and instructing means for instructing said operating process if you meet the operating conditions, changing means for changing the reference table And achieving the first object.
According to a second aspect of the present invention, in the programmable logic controller according to the first aspect, the object displayed on the programmable display is a switch button, and the reference table acquisition means is assigned to the switch button and the switch button. A reference table in which an action process and a possible condition enabling the execution of the action process are associated is acquired, the object specifying means specifies a switch button, and the action process specifying means is the specified switch button The operation process corresponding to is specified based on the reference table.
According to a third aspect of the present invention, in the programmable logic controller according to the second aspect, the reference table acquisition unit acquires a reference table in which a switch button and a lamp display processing operation are associated with each other, and the operation processing specifying unit Specifies the display processing operation of the lamp corresponding to the switch button based on the reference table, and the instruction means instructs the programmable display device the display processing operation specified by the operation processing specifying means. And
According to a fourth aspect of the invention, in the programmable logic controller according to the second or third aspect of the present invention, the programmable logic controller further comprises a detecting unit that detects a switch button operated in the programmable display, and the object specifying unit is controlled by the detecting unit. The detected switch button is specified.
In the invention according to claim 5, there is provided a programmable display capable of performing sequence control by sequentially executing a program indicating control contents based on a signal input from a connected device and arbitrarily setting a screen arrangement. An information processing apparatus for generating a data table used at the time of a control operation in a connected programmable logic controller, comprising: object information acquisition means for acquiring object information displayed on the programmable display; and the object information acquisition means Input from the input screen displayed by the input screen displaying means and the input screen displaying the input screen for setting the operation processing to be assigned to the acquired object and the operation conditions enabling the execution of the operation processing. Accepting the setting of operation processing and operating conditions Setting a reception unit that, was operational processing and operating conditions accepted by the setting acceptance unit, to achieve the second object by providing a generating means for generating a reference table associated with the object, the.
In the invention according to claim 6, there is provided a programmable display device capable of performing sequence control by sequentially executing a program indicating control contents based on a signal input from a connected device and arbitrarily setting a screen arrangement. Reference for acquiring a reference table in which an object displayed on the programmable display, an operation process assigned to the object, and an operation condition that enables execution of the operation process are associated with the connected programmable logic controller A table acquisition function, an object specifying function for specifying an object, an operation processing specifying function for specifying an operation process corresponding to the object specified by the object specifying function based on the reference table, and an operation processing specifying function Action processing that has been An instruction function for whether to satisfy the operating conditions on the ability to determine on the basis of the reference table, and instructs the said operating process if you meet the operating conditions, the changing function of changing the reference table, By realizing the above, the first object is achieved.
In the invention according to claim 7, there is provided a programmable display capable of performing sequence control by sequentially executing a program indicating control contents based on a signal input from a connected device and arbitrarily setting a screen arrangement. An information processing device that generates a data table used during a control operation in a connected programmable logic controller is acquired by an object information acquisition function for acquiring object information displayed on the programmable display and the object information acquisition function. An input screen display function for displaying an input screen for setting an operation process to be assigned to the object, an operation condition for enabling the execution of the operation process, and an operation input from the input screen displayed by the input screen display function Settings to accept processing and operating condition settings And receiving function, the setting acceptance operation processing and operating conditions received by function, to achieve the second object by realizing a generation function of generating a lookup table associated with the object.

According to the first aspect of the present invention, the reference table is obtained by determining the operation process corresponding to the specified object and determining whether or not the specified operation process can be executed based on the reference table. It is possible to provide a programmable logic controller that can easily reflect a change in operation setting defined in an object displayed on a programmable display simply by rewriting.
According to the fifth aspect of the present invention, the operation process assigned to the object, and the input screen for setting the operation condition enabling the execution of the operation process are displayed, and the operation process and the operation condition input from the input screen are displayed. By generating the reference table based on the information processing apparatus, it is possible to provide an information processing apparatus that can easily generate a reference table for reflecting changes in the setting contents of the programmable display device to the PLC.
According to the sixth aspect of the present invention, the reference table is determined based on the reference table by specifying the operation process corresponding to the specified object and determining whether or not the specified operation process can be executed. By simply rewriting, it is possible to provide a control program that can easily reflect changes in operation settings defined for objects displayed on a programmable display.
According to the seventh aspect of the present invention, the operation process assigned to the object and the input screen for setting the operation condition enabling the execution of the operation process are displayed, and the operation process and the operation condition input from the input screen are displayed. By generating the reference table based on the table, it is possible to provide a table creation program capable of easily generating a reference table for reflecting the change in the setting contents of the programmable display device to the PLC.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS.
(1) Outline of Embodiment In the present embodiment, a PLC that performs sequence control by sequentially executing a program indicating control content based on a signal input from a specific input device, and a device connected to the PLC A sequence control system constituted by:
Connected to the PLC are input devices such as sensors and mechanical switches, output devices such as solenoid valves and motors, and programmable displays that function as input / output devices.
The programmable display is a display device that can freely change the screen arrangement and operation by setting.
The PLC is connected to a PC for creating a program for executing a control operation of the PLC and the programmable display, various data, and the like. Programs and data created by the PC are stored in a storage device built in the PLC and used when executing sequence control.

The PLC includes a control operation program that executes the main control of the PLC, a display setting program that performs settings such as the screen arrangement and operation of the programmable display, and operating conditions of objects (switches, etc.) that are displayed on the programmable display. Data such as a switch reference table in which variables (setting items such as operating conditions) assigned to, etc. are defined is stored.
The switch reference table is data that is referred to when the display change program is executed. Output operations (such as driving of output devices and execution of tasks) assigned to objects (switches, etc.) displayed on the programmable display and their outputs. The operation conditions permitting (enabling) the execution of the operation are associated with each other.
For example, when an object such as a switch displayed on the program display is operated, the PLC specifies the output operation assigned to the corresponding switch based on the switch reference table.
Then, the PLC determines whether or not the specified output operation satisfies the operation condition defined in the switch reference table, and executes the corresponding output operation when the condition is satisfied.
According to the present embodiment, it is possible to easily change the operation setting defined for the operation of the object displayed on the programmable display only by changing the variable in the switch reference table.

(2) Details of Embodiment FIG. 1 is a diagram showing a schematic configuration of a sequence control system according to the present embodiment.
As shown in FIG. 1, the sequence control system includes a PLC (programmable logic controller) 1, a programmable display 2, an input device 31, an output device 32, and a PC (personal computer) 4.

FIG. 2 is a diagram illustrating a configuration of the PLC 1 and a connection state of peripheral devices.
As shown in FIG. 2, the PLC 1 includes a storage device 11, an arithmetic device 12, a control device 13, an input / output I / F (interface) 14, an input circuit 15, and an output circuit 16.
The storage device 11 is a device for storing data and programs used for controlling the PLC 1, and is configured by a memory device such as a ROM (Read Only Memory) or a RAM (Random Access Memory).
The storage device 11 stores programs and data such as a control operation program 111, a display setting program 112, a display change program 113, a communication program 114, a switch reference table 115, and a task program 116.

The control operation program 111 is a program for executing a control operation in the PLC 1.
This control operation program 111 is a program described in a dedicated ladder program language, and is described by combining a command word expressed by symbol (symbol) display based on a sequence diagram and device information. ing.
The display setting program 112 is a program for executing settings such as the screen layout and operation of the programmable display device 2.
Note that the display setting program 112 may be stored in a memory device built in the programmable display device 2, and settings such as screen layout and operation may be executed on the programmable display device 2 side.

The display change program 113 is a program for executing a display operation of an object such as a switch or a lamp displayed on the programmable display 2 and a change of a processing operation associated with the object, that is, reflecting these changes to the PLC 1. is there.
The communication program 114 is a program that controls data (signal) communication between the PLC 1 and peripheral devices such as the programmable display 2, the input device 31, the output device 32, and the PC 4 connected to the PLC 1.

The switch reference table 115 is data referred to when the display change program 113 is executed, and is used when accessing a variable assigned (assigned) to an object (switch or the like) displayed on the programmable display 2.
The switch reference table 115 shows the correspondence between the object displayed on the program display 2, the output operation process assigned to the object, and the operation condition that enables the output operation process to be executed.
The switch reference table 115 is a data table created (generated) in the PC 4 using a dedicated program. By changing the contents of the switch reference table 115, switches and lamps displayed on the programmable display 2 are displayed. It is possible to define a display operation of an object such as a change in processing operation associated with the object.

The task program 116 is a program for executing a specific sequence control operation (task) defined in advance.
This task program 116 is assigned an identifier (such as an address indicating a storage unit) for each task. When a task is specified during the execution of the control operation program 111, the task program 116 that executes the corresponding task is displayed. It is configured to read and execute.

The arithmetic device 12 is a device that performs processing at the center of the PLC 1, and includes a CPU (Central Processing Unit) such as a microcomputer.
The arithmetic device 12 executes programs such as a control operation program 111, a display setting program 112, a display change program 113, a communication program 114, and a task program 116 stored in the storage device 11, thereby enabling internal devices and peripheral devices to be executed. The control unit receives data, calculates and processes the data, stores the data in the RAM in the storage device 11, and outputs a result.
The arithmetic unit 12 includes a register for counting the number, that is, a counter. The register is constituted by a small-capacity and high-speed memory used for temporarily storing data.
The control device 13 is a device that executes control in the PLC 1 together with the arithmetic device 12.

The input / output I / F 14 is an interface for performing data (signal) communication between the PLC 1 and the PC 4. Data communication between the PLC 1 and the PC 4 can be performed using cable communication such as a USB (Universal Serial Bus) cable, infrared communication, or the like.
The input circuit 15 is an external device of the PLC 1 such as an output signal output from an input device 31 such as various sensors or mechanical switches installed on the device or the operation panel, or an operation signal input via the programmable display 2 ( This is a circuit device that captures an input signal from a peripheral device.

The output circuit 16 outputs a control signal to the output device 32 and the programmable display 2 based on the results of the control operation program 111, the display setting program 112, the display change program 113, the task program 116, and the like executed in the arithmetic unit 12. Circuit device.
The PLC 1 configured as described above sequentially executes programs indicating control contents such as the control operation program 111, the display setting program 112, and the display change program 113 based on signals input from the input device 31 and the program display 2. Perform sequence control by executing.

FIG. 3 is a diagram showing the configuration of the PC 4 and the connection state of peripheral devices.
As shown in FIG. 3, the PC 4 includes an information processing apparatus including a storage device 41, a calculation device 42, an input device 43, an output device 44, a control device 45, and an input / output I / F 46.
The storage device 41 is a device that stores data and programs used for control of the PC 4, and includes a memory device such as a ROM, a RAM, and a hard disk.
In the storage device 41, in addition to a program for executing system management of the PC 4 and an OS (operation system) that provides a basic operating environment, a setting parameter 411, a ladder creation program 412, a ladder change program 413, a display screen setting program 414 In addition, programs and data such as a data conversion program 415 and a communication program 416 are stored.

The setting parameter 411 is various data given to processing executed by the PC 4, and is data required to specify data, command functions, and options specified when using a specific function.
The ladder creation program 412 is a program for creating the control operation program 111 for executing the control operation in the PLC 1.
The ladder change program 413 is a program that changes the contents of the control operation program 111 created by the ladder creation program 412.

The display screen setting program 414 is a program for creating a program for creating (setting) objects such as switches and lamps displayed on the display setting program 112 and the programmable display 2 and setting the screen arrangement of the objects.
The display screen setting program 414 has a function as a program for creating the display change program 113.
The data conversion program 415 is a program that performs conversion processing based on setting conditions input by the operator of the PC 4 and creates (generates) a switch reference table 115 that is used when the display change program 113 is executed in the PLC 1.
The communication program 416 is a program for controlling communication of data (signals) between a peripheral device such as the PLC 1 connected to the PC 4 and the PC 4.

The arithmetic device 42 is a device that performs processing at the center of the PC 4, and is configured by a CPU (Central Processing Unit).
In the computing device 42, the OS program, setting parameter 411, ladder creation program 412, ladder change program 413, display screen setting program 414, data conversion program 415, communication program 416, etc. stored in the storage device 41 are stored. By executing this, the internal device and peripheral devices are controlled to receive data, and the data is calculated and processed, stored in the RAM in the storage device 41, and a result is output. .

The input device 43 is a device for inputting commands and data to the PC 4 and includes a keyboard, a mouse, a digital camera, a scanner, a tablet, a joystick, a video input device, a voice input device, a barcode reader, and the like.
It is also possible to take in (input) data from the outside of the PC 4, and in this case, a reading device for reading a storage medium storing the data functions as the input device 43. It is also possible to import (input) data into the PC 4 via a network such as the Internet.

The output device 44 is a device that outputs the processing result of the PC 4 to the outside, and is configured by a display, a printer, a plotter, a voice output device, or the like that outputs the processing result as characters, numbers, images, etc. that can be recognized by humans. Yes.
In this embodiment, a display is used as the output device 44, and an input screen when the ladder creation program 412, the ladder change program 413, the display screen setting program 414, etc. are executed on the display screen of this display. Is displayed.
The operator of the PC 4 inputs data such as parameters based on the contents displayed on the display.
The control device 45 is a device that executes control in the PC 4 together with the arithmetic device 42.
The input / output I / F 46 is an interface for performing data (signal) communication between the PLC 1 and the PC 4. Data communication between the PLC 1 and the PC 4 can be performed using cable communication such as a USB (Universal Serial Bus) cable, infrared communication, or the like.

Returning to the description of FIG. 1, the programmable display 2 connected to the PLC 1 has a man-machine interface function and functions as an input / output device of the PLC 1 described above.
The programmable display device 2 is a display that displays a screen set by the display setting program 112. In the present embodiment, a touch panel display device (hereinafter referred to as a touch panel) is used.
A touch panel is a device having a screen screen that enables pointing (selection) by directly touching a screen on which menu items or the like are displayed with a finger, for example, by including a pressure-sensitive or electrostatic panel. .
The programmable display device 2 may be configured by a liquid crystal display or a CRT (CRT) display that does not have a touch panel function. In this case, an input device such as a keyboard and a mouse for operating a cursor (pointer) on the screen is provided to select a switch such as a menu item to be displayed.

FIG. 4 is a diagram illustrating an example of a display screen displayed on the programmable display device 2.
The programmable display device 2 displays the set screen on the display by activating the display setting program 112 that is stored in the PLC 1 or the programmable display device 2 and executes settings such as screen arrangement and operation.
As shown in FIG. 4, on the display, for example, a process chart showing the status of the manufacturing process controlled by the PLC 1, an indicator showing the remaining amount of each fuel, fuel supply by pressing (selecting), A plurality of switches (switch buttons) 21 capable of instructing (inputting) processing operations such as arm position adjustment (arm movement) and the like, a lamp 22 indicating the operation state of each switch 21 and the like are displayed.

For example, when the operator depresses (selects) the switch 21 to which the processing operation “A fuel supply” is assigned, as shown in FIG. 4, the corresponding lamp 22 is turned on. Yes.
The color of the lamp 22 to be lit and the display form (luminance at the time of lighting, blinking speed, etc.) are set in advance by the display setting program 112, but if the display change program 113 is activated in the PLC 1, the display change program The contents defined in 113, that is, the setting conditions (instruction contents) shown in the switch reference table 115 are reflected with priority.

Next, a method for creating the switch reference table 115 used when defining a change in the display operation or processing operation of an object displayed on the programmable display 2 will be described.
In the present embodiment, the switch reference table 115 is configured so that data created (generated) in the PC 4 is transmitted to the PLC 1. Here, a method for creating the switch reference table 115 in the PC 4 is described. explain.
The display screen setting program 414 is activated on the PC 4 and a change setting menu for changing the operating conditions of the objects (switches and the like) displayed on the programmable display 2 is selected.
For example, the PC 4 reads the display setting program 112 that sets the screen arrangement of the programmable display device 2 and acquires information on objects (such as the switch 21 and the lamp 22) defined in the program.
Based on the acquired information, the PC 4 displays on the display a setting screen (change screen) for operating conditions assigned to each object.

FIG. 5 is a diagram showing an example of a screen for setting an operation for each switch number.
In the present embodiment, a case where the switch 21 as shown in FIG. 4 is used as an object will be described. Each switch 21 is assigned a switch number that functions as an identifier. Here, switch numbers 1 to 512 can be provided.
In the present embodiment, as an operation assigned to the switch 21, a “Sol” mode for driving a solenoid valve that is one of the output devices 32 and a “Task” mode for executing a designated task program 116 are provided. The case will be described.
In the “Sol” mode, a single solenoid or a double solenoid can be selected and set.

Using the form as shown in FIG. 5, the switch 21 is set for each switch number.
The operator sets (inputs) the operation mode assigned to the switch 21 in the mode setting item on the setting screen.
This operation mode can be set by selecting either “Sol” or “Task” from the pull-down menu.
FIG. 5A shows an example of the display screen when the “Sol” mode is selected, and FIG. 5B shows an example of the display screen when the “Task” mode is selected.
When the “Sol” mode is selected in the mode setting item, as shown in FIG. 5A, an item for inputting the output setting, that is, the setting (instruction) of the solenoid valve to be operated is displayed.

The operator sets (inputs) the type (single solenoid or double solenoid) of the solenoid valve assigned to the switch 21 and the address information of the solenoid valve.
On the other hand, when the “Task” mode is selected as the mode setting item, an item for inputting the setting (instruction) of the task to be executed is displayed as shown in FIG.
The task set here is stored in the storage device 11 of the PLC 1 as a task program 116 described in advance in a dedicated language.
The operator sets (inputs) an identifier (task number) of a task assigned to the switch 21 and a flag.

In addition, when the lamp 22 as shown in FIG. 4 is assigned to the switch 21, the lamp 22 to be assigned is set in the lamp setting item.
In the lamp setting item, the address information of the lamp 22 to be displayed, the presence / absence of lighting (on / off) at the time of execution of the operation assigned to the switch 21 and the like are set (input).
Although not shown, the lamp setting item is configured such that the color of the lamp 22 to be displayed and the display form (such as the brightness and the blinking speed) can be set as an extended function.

Further, an operation condition setting item for inputting (setting) the operation condition of the mode set in the mode setting item is displayed.
In the operation condition setting item, the operator sets an operation condition that can actually execute the operation (solenoid valve drive or task execution) assigned to the switch 21.
For example, the operation condition is set by inputting an AND condition or an OR condition based on an input signal from the input device 31 and an internal restriction (such as an interlock).
In the present embodiment, when the operation condition set here is not satisfied, the assigned operation cannot be executed even when the corresponding switch 21 is operated.
Note that the setting items such as the operating conditions of the object (switch 21) set in this way function as variables assigned to each object (switch 21).
This variable can be assigned by an editor program (editing program) such as the display screen setting program 414.

The PC 4 receives the operator setting (input) on the operation condition setting screen described above for each switch number and stores it in the storage device 41.
Then, after the setting of the operation conditions for all the switches 21 (or the switch 21 whose setting is to be changed) is completed, the data conversion program 415 is activated on the PC 4.
Then, the setting (input) data stored in the storage device 41 is converted, and the switch reference table 115 is created (generated).
FIG. 6 is a diagram illustrating an example of the switch reference table 115.
The condition setting data set by the operator is a switch reference table, which is a two-dimensional data table in which the settings (definition data) of items assigned to the switch 21 are arranged in the order of switch numbers as shown in FIG. 115.

“Switch number” in the switch reference table 115 indicates an address number assigned to the switch 21 displayed on the programmable display 2 by a serial number. “Mode” indicates an operation assigned to the switch 21 (“Sol” mode or "Task" mode). “Output 1” and “Output 2” indicate address information of the output destination of the drive signal of the solenoid valve, and “Lamp” indicates address information of the output destination of the operation signal of the lamp 22.
The wavy line portion (switch number “17”) in FIG. 6 is a row in which the input data of the condition setting in the display screen (when “Sol” mode is selected) shown in FIG. Show.
The switch reference table 115 created (generated) in the PC 4 in this way is transmitted (transferred) to the PLC 1 via the input / output I / F 14. The PLC 1 stores the received switch reference table 115 in the storage device 11.

Next, the control operation of the PLC 1 when the switch 21 displayed on the programmable display 2 in the sequence control system according to the present embodiment is operated by an operator will be described.
FIG. 7 is a flowchart showing the processing procedure of the control operation of the PLC 1 when the switch 21 displayed on the programmable display 2 is operated.
When power is turned on to the PLC 1, the arithmetic device 12 reads the control operation program 111, the display setting program 112, and the display change program 113 from the storage device 11 and activates them.

When each program is executed in the PLC 1, the arithmetic unit 12 determines whether or not a press (operation) signal of the switch 21 is detected in the programmable display 2 (step 11).
When the switch 21 is pressed (operated) in the programmable display 2, a corresponding pressing signal of the switch 21 is input from the programmable display 2 to the PLC 1 via the input circuit 15.
The arithmetic unit 12 determines whether or not a pressing signal of the switch 21 is input to the input circuit 15. It should be noted that the determination as to whether or not a pressing signal for the switch 21 has been input functions as detection means.

When the pressing signal of the switch 21 is not detected (step 11: N), the arithmetic unit 12 continues the signal detection process.
On the other hand, when the pressing signal of the switch 21 is detected (step 11: Y), the arithmetic unit 12 determines the switch number assigned to the pressed switch 21 based on the pressing signal input to the input circuit 15. Identify. This switch number specification functions as an object specifying means.
Then, the arithmetic device 12 refers to (reads out) the switch reference table 115 stored in the storage device 11 and acquires the data of the operating condition assigned to the corresponding switch number (specified switch number) ( Step 12). The acquisition of the data of the operation condition functions as an operation process specifying unit.

Subsequently, the arithmetic unit 12 determines whether or not the processing operation (solenoid valve drive or task execution) assigned to the corresponding switch number is possible based on the acquired operation condition data, that is, the operation of the processing operation. It is determined whether or not a condition (an internal restriction condition such as an interlock) is satisfied (step 13).
When the operation condition of the processing operation assigned to the corresponding switch number is not satisfied, that is, when the processing operation cannot be executed (step 13: N), the arithmetic unit 12 continues the signal detection process. To do.
On the other hand, when the operation condition of the processing operation assigned to the corresponding switch number is satisfied, that is, when the processing operation can be executed (step 13: Y), the arithmetic unit 12 adds the acquired operation condition data to the acquired operation condition data. Based on this, it is determined whether or not the processing operation assigned to the corresponding switch number is the Sol mode indicating the driving of the solenoid valve (step 14).

When the processing operation assigned to the corresponding switch number is the Sol mode (step 14; Y), the arithmetic unit 12 sends the drive signal to the corresponding solenoid via the output circuit 16 based on the acquired operation condition data. Output to the valve (output device 32) to drive the solenoid valve (step 15).
On the other hand, when the processing operation assigned to the corresponding switch number is not the Sol mode (step 14; N), that is, when the processing operation assigned to the relevant switch number is the Task mode, the arithmetic unit 12 acquires Based on the operation condition data, the task program 116 for executing the designated task (operation sequence) is started to execute the operation sequence (step 16).
Note that the determination of the operation condition of the processing operation and the driving of the solenoid valve or the execution of the operation sequence function as instruction means.

Subsequently, the arithmetic device 12 determines whether or not the programmable display device 2 is being activated (step 17). The determination as to whether or not the programmable display 2 is being activated can be made based on, for example, the power management state of the program display 2.
When the program display 2 is activated (step 17: Y), the arithmetic unit 12 returns to the process of step 11 and continues the signal detection process.
On the other hand, when the program display 2 is not activated (step 17: N), for example, when the supply of power to the programmable display 2 is in a stopped state, the processing is ended as it is.

  As described above, when the program (ladder program) that executes the processing of the control operation of the PLC 1 when the switch 21 displayed on the programmable display 2 is operated, the PLC 1 monitors the state of the programmable display 2. The control operation reflecting the contents of the switch reference table 115 (corresponding to the contents) can be executed.

Next, the display operation of the lamp 22 associated with (linked to) the switch 21 displayed on the programmable display 2 in the sequence control system according to the present embodiment will be described.
FIG. 8 is a flowchart showing the processing procedure of the display operation of the lamp 22 displayed on the programmable display 2.
Here, a method of reflecting the display operation (ON / OFF operation) of the lamp 22 defined (set) in the switch reference table 115 on the programmable display 2 will be described.

The arithmetic device 12 reads the display change program 113 from the storage device 11 and activates it.
When the PLC 1 is activated, the arithmetic unit 12 first performs a reset process of a counter that counts a built-in switch number, that is, a process that returns the counter value to “0 (zero)” (step 21).
Next, the arithmetic unit 12 executes a count-up process of adding (adding) “1” to the counter value of the switch number (step 22).
Subsequently, the arithmetic device 12 refers to (reads out) the switch reference table 115 stored in the storage device 11, and acquires the data of the operating condition assigned to the switch number corresponding to the counter value (step 23). .

Next, the arithmetic unit 12 sends the control signal (ON signal or OFF signal) of the corresponding lamp 22 via the output circuit 16 based on the setting of the display operation of the lamp assigned to the switch number corresponding to the counter value. To change the setting of the display operation of the lamp 22 in the programmable display 2 (step 24).
Subsequently, the arithmetic device 12 determines whether or not the programmable display device 2 is being activated (step 25).
If the programmable display 2 is not activated (step 25: N), for example, if the supply of power to the programmable display 2 is in a stopped state, the process is terminated as it is.

On the other hand, when the programmable display 2 is being activated (step 25: Y), the arithmetic unit 12 calculates the switch number counter value and the maximum value of the switch number attached to the switch 21 provided in the programmable display 2. Are compared to determine whether the counter value of the switch number is smaller than the maximum value of the switch number (step 26).
If the counter value of the switch number is smaller than the maximum value of the switch number (step 26: Y), the arithmetic unit 12 continues to return to the process of step 22.
On the other hand, when the counter value of the switch number is not smaller than the maximum value of the switch number (step 26: N), that is, when the counter value of the switch number reaches the maximum value of the switch number, the arithmetic unit 12 Returning to the processing, a series of processing is continued from the counter reset processing.

In the PLC 1, the processing of the display operation of the lamp 22 displayed on the series of programmable displays 2 described above is performed by the control operation of the PLC 1 by the control operation program 111 or the operation of the switch 21 displayed on the programmable display 2. The display operation of the lamp 22 set (changed) in the switch reference table 115 is reflected in the programmable display 2 in real time regardless of the control operation (solenoid valve drive control or task execution sequence). be able to.
Further, in the present embodiment, the lamp 22 assigned to the switch 21 has been described, but the display item that can be assigned to the switch 21, that is, the object is not limited to this.
For example, a display screen for the number of cycle times of a sequence, a display screen for the number of productions, and the like may be assigned. When displaying such a counter, only the counter may be displayed without displaying the corresponding object.

As described above, according to the present embodiment, in the PC 4, the switch reference table 115 indicating the contents of the change setting is displayed on the programmable display 2 with objects (such as the switch 21 and the lamp 22) and the control operation. Since they can be created while associating with each other, it is possible to flexibly and easily cope with the addition / change of the display content of the programmable display device 2.
According to the present embodiment, it is possible to change the display setting of the programmable display 2 or the operation setting defined in the object (switch 21) operation only by changing the variable in the switch reference table 115. The function of the programmable display device 2 can be easily expanded.

Further, according to the present embodiment, when the switch reference table 115 is created in the PC 4, the display operation of the object displayed on the programmable display 2 without using a program written in the dedicated ladder program language. And processing operations can be set. Therefore, when creating the switch reference table 115, the ladder program special knowledge is not required, so that the programmable display device 2 can be developed efficiently.
According to the present embodiment, the “Task” mode for executing the designated task program 116 can be designated in the mode setting items shown in FIG. Since the control and the object displayed on the programmable display 2 can be easily associated with each other, the software development period corresponding to the programmable display 2 can be shortened.

Further, according to the present embodiment, as shown in FIG. 9, for sequence control in which the output operation Y1 is defined for the input condition X1, that is, for one operation (input signal) of the input device, Simple sequence control in which one output operation of the output device is defined can be executed by the PLC 1 without creating a ladder program.
For example, in the programmable display 2, when the switch 21 corresponding to the switch number “1” is pressed (operated), the solenoid valve corresponding to the address “0001” of the output device 32 is driven, or the switch number “2” is selected. When the switch 21 corresponding to "" is pressed (operated), the PLC 1 can easily perform operations such as turning on the lamp 22 assigned to the switch number “2”.

The process performed by reading the switch reference table 115 can be performed in parallel with the control operation program 111 that executes the main control of the PLC 1.
Therefore, for example, by giving priority to the display change program 113 or the like that reads the switch reference table 115 and executes processing, even if the control operation is previously defined in the control operation program 111, it is easy. The change in the definition content can be reflected in PLC1.
Thereby, the development period of software corresponding to the programmable display device 2 can be shortened.

In addition, according to the present embodiment, the activation (execution) of the task program 116 stored at the specified address can be set in the output operation Y1 shown in FIG. In addition to on / off control, fine sequence control operation settings can be made.
Furthermore, according to the present embodiment, since the contents of condition settings that have been described in the ladder program with AND / OR conditions, internal restrictions (interlock conditions), etc., can be shown in the switch reference table 115, FIG. The operation permission condition (operation condition) of the output operation Y1 shown in FIG. 9 can be set without using a ladder program. Thereby, detailed operation permission conditions (operation conditions) of the output operation Y1 can be easily set.

It is the figure which showed schematic structure of the sequence control system which concerns on this Embodiment. It is the figure which showed the structure of PLC and the connection state of a peripheral device. It is the figure which showed the structure of PC, and the connection state of peripheral devices. It is the figure which showed an example of the display screen displayed on a programmable display. It is the figure which showed an example of the screen which sets operation | movement for every switch number. It is the figure which showed an example of the switch reference table. It is the flowchart which showed the processing procedure of the control action of PLC at the time of operation of the switch displayed on a programmable display. It is the flowchart which showed the process sequence of the display operation | movement of the lamp | ramp displayed on a programmable display. It is the figure which showed the ladder circuit of simple sequence control.

Explanation of symbols

1 PLC
2 Programmable display 4 PC
11 Storage Device 12 Arithmetic Device 13 Control Device 14 Input / Output I / F
DESCRIPTION OF SYMBOLS 15 Input circuit 16 Output circuit 21 Switch 22 Lamp 31 Input device 32 Output device 41 Memory | storage device 42 Arithmetic device 43 Input device 44 Output device 45 Control device 46 Input / output I / F
111 Control operation program 112 Display setting program 113 Display change program 114 Communication program 115 Switch reference table 116 Task program 411 Setting parameter 412 Ladder creation program 413 Ladder change program 414 Display screen setting program 415 Data conversion program 416 Communication program

Claims (7)

This is a programmable logic controller that performs sequence control by sequentially executing a program that indicates the contents of control based on a signal input from a connected device, and is connected to a programmable display whose screen arrangement can be arbitrarily set. And
A reference table acquisition means for acquiring a reference table in which an object displayed on the programmable display is associated with an operation process assigned to the object and an operation condition enabling execution of the operation process;
An object identification means for identifying an object;
Action processing specifying means for specifying the action processing corresponding to the object specified by the object specifying means based on the reference table;
Based on the reference table, it is determined whether the operation process specified by the operation process specifying unit satisfies an operation condition that enables execution of the process. An instruction means for instructing
Changing means for changing the reference table;
A programmable logic controller comprising: The object displayed on the programmable display is a switch button,
The reference table acquisition means acquires a reference table in which a switch button is associated with an operation process assigned to the switch button and a possible condition for enabling the execution of the operation process,
The object specifying means specifies a switch button,
The programmable logic controller according to claim 1, wherein the operation process specifying unit specifies an operation process corresponding to the specified switch button based on the reference table. The reference table acquisition means acquires a reference table in which switch buttons and lamp display processing operations are associated with each other,
The operation processing specifying means specifies the display processing operation of the lamp corresponding to the switch button based on the reference table,
3. The programmable logic controller according to claim 2, wherein the instruction unit instructs the programmable display unit to perform a display processing operation specified by the operation processing specifying unit. Detecting means for detecting a switch button operated in the programmable display;
4. The programmable logic controller according to claim 2, wherein the object specifying unit specifies a switch button detected by the detecting unit. Based on the signal input from the connected device, the sequence control is performed by sequentially executing the program showing the control contents, and the control in the programmable logic controller to which the programmable display whose screen arrangement can be arbitrarily set is connected An information processing apparatus for generating a data table used during operation,
Object information acquisition means for acquiring information of an object displayed on the programmable display;
An input screen display means for displaying an operation screen for assigning an operation process to be assigned to the object acquired by the object information acquisition means and an operation condition for enabling the execution of the operation process;
Setting accepting means for accepting the setting of operation processing and operating conditions input from the input screen displayed by the input screen displaying means;
Generating means for generating a reference table in which the operation process and the operation condition received by the setting receiving means are associated with an object;
An information processing apparatus comprising: Based on the signal input from the connected device, the sequence control is performed by sequentially executing the program showing the control contents, and the programmable logic controller to which the programmable display capable of arbitrarily setting the screen arrangement is connected,
A reference table acquisition function for acquiring a reference table in which an object displayed on the programmable display is associated with an operation process assigned to the object and an operation condition that enables execution of the operation process;
An object identification function for identifying objects;
An action process specifying function for specifying an action process corresponding to the object specified by the object specifying function based on the reference table;
Based on the reference table, it is determined whether the operation process specified by the operation process specifying function satisfies an operation condition that enables execution of the process. If the operation process satisfies the operation condition, the operation process is performed. An instruction function to instruct
A change function for changing the reference table;
Control program to realize. Based on the signal input from the connected device, the sequence control is performed by sequentially executing the program showing the control contents, and the control in the programmable logic controller to which the programmable display whose screen arrangement can be arbitrarily set is connected In an information processing device that generates a data table used during operation,
An object information acquisition function for acquiring information of an object displayed on the programmable display;
An input screen display function for displaying an input screen for setting an operation process to be assigned to the object acquired by the object information acquisition function and an operation condition for enabling the execution of the operation process;
A setting acceptance function for accepting the setting of operation processing and operation conditions input from the input screen displayed by the input screen display function;
A generation function for generating a reference table in which the operation process and the operation condition received by the setting reception function are associated with an object;
A table creation program for realizing

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