JP4346387B2 - Display control system - Google Patents

Description

  The present invention relates to a display device capable of switching the display of a screen based on an instruction from a control device having a function of controlling the operation of a control target device, and particularly to the control device when the switching of the display is canceled. The present invention relates to a display device that notifies cancellation.

  The operation of the automatic assembly machine, the belt conveyor, and other control target devices is controlled by the control device, and the state of the control target device is displayed on a display (for example, a programmable display) connected to the control device. This display can provide information to the user or detect information input to the user by appropriately switching the display on the screen. This switching is performed based on a user switching instruction or an instruction from the control device. The control device includes a PLC (Programmable Logic Controller) device, a PC (Personal Computer), and other devices.

  In such a display device that can switch the screen display based on an instruction from the outside, when switching the display to a screen with a lower degree of access restriction than the screen being displayed, the data necessary for switching the display May not be required. On the other hand, some users may want to restrict the display of each screen in order to prohibit the display of a specific screen and prevent the presentation of unnecessary information.

  Therefore, in order to cope with such a case, for example, Japanese Patent Laid-Open No. 2001-202108 (Patent Document 1) discloses that a person other than the administrator suppresses display of an important operation state among device states. A display capable of being disclosed is disclosed. This display unit is associated with the input unit, a plurality of screens for setting or displaying the operating state of the target device, a restriction level that defines a restriction on whether or not display is associated with each screen, and each restriction level. A storage unit that stores passwords, a reception unit that receives screen display change requests, a comparison unit that compares the control level of the original screen with the control level of the target screen, and the restriction level of the target screen It includes an input request unit that requests input of the associated password and a change unit that changes the display to the change destination screen.

According to the display device disclosed in Patent Literature 1, when a change request for a display screen is generated and the restriction level of the change destination screen is higher than the restriction level of the change source screen, The password associated with the restriction level is requested to be entered. By changing the display of the screen only when the password is input, it is possible to control whether or not the display can be performed when the display is changed from a screen having a lower restriction level to a screen having a higher restriction level. That is, when a valid password is input, the screen display is changed to the display of the change destination screen.
JP 2001-202108 A

  However, according to the display device disclosed in Patent Document 1, when an incorrect password is input, the screen of the change source is displayed. At this time, if the control device (for example, PLC) that has transmitted an instruction to change the screen to the display device stores data representing the display of the changed screen, the changed screen is displayed on the display device. Recognize. In this case, if another instruction is output to the display unit after the screen switching instruction, the display state on the display unit and the state indicated by the display information on the control unit are inconsistent. In addition, there may be a problem in switching the display to another screen.

  The present invention has been made in order to solve the above-described problems, and its purpose is to provide a control device capable of preventing the occurrence of a control failure even if the switching of the screen in the display device is canceled, and its A display control system including a display is provided.

  Another object of the present invention is to provide a display device capable of preventing the occurrence of a control failure by the control device even if the screen switching based on the instruction from the control device is cancelled.

  Still another object of the present invention is to provide a program capable of causing a computer to function as a display capable of preventing the occurrence of a control failure by a control device even when screen switching based on an instruction from the control device is cancelled. Is to provide.

  Still another object of the present invention is to provide a program capable of causing a computer to function as a display capable of preventing the occurrence of a control failure by a control device even when screen switching based on an instruction from the control device is cancelled. Is provided.

  According to an aspect of the present invention, a display control system includes a control device that controls the operation of a control target device, a function that displays the state of the control target device, and a function that instructs control of the operation of the control target device. With. The display includes a display means for displaying a screen, a storage means for storing control information for controlling a change in the display of the screen, and a receiving means for receiving an instruction to change the display of the screen from the control device. An input means for the user to input an instruction; a determination means for determining whether or not to cancel the display change based on the input of the instruction by the user when the change instruction is received; and a display change If it is determined that the display change is canceled, a notification means for notifying the control device that the display change has been canceled, and if it is determined not to cancel the display change, the display for changing the screen display is determined based on the change instruction. Changing means. On the other hand, the control device notifies the display device of means for communicating, identification information storage means for storing identification information for identifying the screen displayed on the display device, and cancellation of display change from the display device. Then, a recovery means is provided for returning the identification information stored in the identification information storage means to the identification information representing the screen displayed on the display before the change instruction is output.

  According to the display control system having such a configuration, when the display device receives the display change instruction transmitted from the control device, the display determination unit cancels the display change based on the input of the instruction by the user. Determine whether or not. The input of the instruction includes an input of a cancel instruction, an input of authentication information, or a case where no input is performed within a predetermined time. When the determination unit determines to cancel the display change, the notification unit notifies the control device that the display change is cancelled. For example, data notifying the cancellation is transmitted from the display unit to the control device. On the other hand, when the determination unit determines not to cancel the display change, the change unit changes the display of the screen based on the change instruction. On the other hand, when the control device receives a notification of cancellation of the display change from the display, the recovery means displays the identification information stored in the identification information storage means on the display before the change instruction is output. Return to the identification information representing the screen. In this case, since the identification information of the screen of the display device in the control device matches the display of the actual screen on the display device, another control based on the information on the screen (for example, display of another screen, etc.) Can also be executed correctly. As a result, it is possible to provide a control device that can prevent the occurrence of a control failure even if the switching of the screen on the display device is cancelled, and a display control system including the display device.

  According to another aspect of the present invention, the display device has a function of displaying a state of the control target device whose operation is controlled by the control device and a function of instructing control of the operation of the control target device. The display includes a display unit for displaying a screen, a storage unit for storing control information for controlling a change in the display of the screen, and a receiving unit for receiving an instruction to change the display of the screen from the control device. An input means for the user to input an instruction; a determination means for determining whether or not to cancel the display change based on the input of the instruction by the user when the change instruction is received; and a display change If it is determined that the display change is canceled, a notification means for notifying the control device that the display change has been canceled, and if it is determined not to cancel the display change, the display for changing the screen display is determined based on the change instruction. Changing means.

  According to the display device having such a configuration, when an instruction to change the screen display is received from the control device, the determination unit determines whether or not to cancel the display change based on the input of the instruction by the user. When the determination unit determines to cancel the display change, the notification unit notifies the control device that the display change is cancelled. On the other hand, when the determination unit determines not to cancel the display change, the change unit changes the display of the screen based on the change instruction. In this way, the control device can match the information on the display screen on the display device with the information on the screen that is actually displayed, so that other control based on the screen information can also be executed correctly. Thereby, even if the switching of the screen based on the instruction from the control device is cancelled, it is possible to provide a display that can prevent the occurrence of a control failure by the control device.

  Preferably, the notification means includes generation means for generating communication data notifying that the display change has been canceled, and transmission means for transmitting the generated communication data to the control device.

  According to the display device having such a configuration, when the display change is canceled, communication data for notifying the cancellation (for example, data including a bit for notifying cancellation) is transmitted to the control device. Since the control device can update the information on the display screen of the display device based on the data, the occurrence of a control failure for the display device is prevented.

  Preferably, the control information is stored in association with information stored in the control device.

  According to the display device having such a configuration, the mismatch between the stored control information and the information stored in the control device is suppressed, so that it is possible to prevent the occurrence of control failure by the control device.

  Preferably, the display unit displays a screen requesting input of an instruction as to whether or not to cancel the display change. When an instruction to cancel the display change is input, the determining unit determines to cancel the display change.

  According to the display device having such a configuration, when the user inputs an instruction to cancel the display change on the screen requesting input of an instruction to cancel the display change, the display device displays the display. Data for canceling the change is transmitted to the control device. As a result, the control device can update the information on the display screen on the display.

  Preferably, the display unit displays a screen requesting input of authentication information used for determining whether or not the display can be changed. The judging means cancels the screen display change when the matching means for executing the matching process for confirming whether or not the control information and the authentication information match, and the control information and the authentication information do not match. And a cancellation determination means for determining.

  According to the display device having such a configuration, when the user inputs the authentication information, the verification unit confirms whether or not the control information matches the authentication information. If the control information and the authentication information do not match, the cancellation determination means determines to cancel the screen display change. As a result, the notification means notifies the control device that the display of the screen on the display device has been cancelled, so that the screen information of the display device held by the control device is maintained at the same information as the actual display screen.

  Preferably, the control information includes a predetermined number of times and a number of times that allows a mismatch in the matching process. The verification unit repeatedly executes the verification process when the authentication information and the control information do not match. The cancellation determination means determines to cancel the display change when the number of mismatches reaches a predetermined number.

  According to the display device having such a configuration, when the authentication information and the control information do not match, the verification unit repeatedly executes the verification process. When the number of mismatches reaches a predetermined number, the cancellation determination unit determines to cancel the display change. Thus, by setting the opportunity of inputting authentication information a plurality of times, it is possible to reliably notify the control device of the cancellation of the screen while allowing a user to fail to input.

  Preferably, the control information includes a waiting time that is a predetermined time and is allowed to be input by the user. The display means displays a reception screen for accepting input of authentication information used for determining whether or not the display can be changed. The determination unit determines to cancel the display switching of the screen when the time elapsed without the authentication information being input after the reception screen is displayed exceeds the waiting time.

  According to the display device having such a configuration, in the reception screen that accepts the input of the authentication information that controls the change of the display, if the elapsed time without the input of the authentication information exceeds the waiting time, the determination unit It is determined to cancel the display switching. In this way, it is possible to reliably notify the control device that the switching of the display of the screen on the display unit has been canceled while limiting the input standby state on the display unit.

  Preferably, the display further includes driving means for driving the medium on which the identification information of the user is recorded and for reading the identification information from the medium. The determination means compares the read identification information with the control information. If the identification information and the control information do not match, it is determined to cancel the screen display change.

  According to the display device having such a configuration, when a user inserts a medium (for example, an ID (Identification) card) into the driving unit, information stored in the medium is read out. The information is compared with the control information stored in the display, and when the identification information and the control information do not match, the determination unit determines to cancel the display change on the screen. In this way, since the user does not need to input authentication information, data input mistakes are suppressed.

  According to still another aspect of the present invention, a program is a computer having a function of displaying a state of a control target device whose operation is controlled by a control device and a function of instructing control of the operation of the control target device. To work. The program includes a display step for displaying a screen on a computer, a preparation step for preparing control information for controlling a change in the display of the screen in advance, a receiving step for receiving an instruction to change the display of the screen from the control device, and a user. A detection step for detecting an instruction input by the user, a determination step for determining whether or not to cancel the display change based on the input of the instruction by the user, and a determination to cancel the display change when the change instruction is received. Then, a notification step for notifying the control device that the display change has been canceled and a change step for changing the display on the screen based on the change instruction are executed when it is determined not to cancel the display change.

  According to the program having such a configuration, the computer prepares control information in advance by reading data from, for example, a memory or other storage device in a preparation step. When the computer receives the change instruction from the control device, the computer determines whether to cancel the display change based on an instruction (for example, an instruction to cancel, input of authentication information, etc.) input by the user. When the computer determines to cancel the display change, it notifies the control device that the display change has been canceled. In this way, the control device can match the information on the display screen on the display device with the information on the screen that is actually displayed, so that other control based on the screen information can also be executed correctly. Thereby, even if the switching of the screen based on the instruction from the control device is cancelled, it is possible to provide a program that can cause the computer to function as a display that can prevent the occurrence of control failure by the control device. .

  According to still another aspect of the present invention, the recording medium stores a program for causing a computer to realize a function capable of switching display of a screen based on an instruction from a control device having a communication function.

  According to such a recording medium, when the computer reads the program from the recording medium and executes the program, the computer may cause a malfunction of the control by the control device even if the switching of the screen based on the instruction from the control device is cancelled. It functions as a display that can be prevented.

  ADVANTAGE OF THE INVENTION According to this invention, even if the switching of the screen in a display is canceled, the control apparatus which can prevent generation | occurrence | production of a malfunction of control, and the display control system containing the display can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, even if the switching of the screen based on the instruction | indication from a control apparatus is canceled, the display which can prevent generation | occurrence | production of the malfunction of control by a control apparatus can be provided.

  According to the present invention, there is provided a program capable of causing a computer to function as a display capable of preventing the occurrence of a control failure by a control device even when screen switching based on an instruction from the control device is cancelled. Can do.

  According to the present invention, even if the switching of the screen based on the instruction from the control device is cancelled, the recording that records the program that can cause the computer to function as a display that can prevent the occurrence of control failure by the control device. A medium can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  A display device according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a functional block diagram showing a programmable display device 100 having a display screen switching function and a switching cancel notification function.

  The programmable display device 100 includes a main storage unit 110 for storing data, an auxiliary storage unit 120 for storing data, a communication data generation unit 134 for generating communication data, and cancellation of display screen switching. A switching cancel detection unit 136 for detecting the communication, a communication control unit 140 for controlling communication with the outside, a display unit 160 for displaying characters, a screen, and the like, and an operation of the display unit 160 Display control unit 150, input unit 180 for a user to input information, and input control unit 170 for controlling the operation of input unit 180. The communication control unit 140 is connected to the PLC 300 via the network 190. The PLC 300 is connected to the control target device 360.

  The communication data generation unit 134 generates data to be transmitted to the external device 142 when the operation state of the programmable display device 100 is a predetermined state. Here, the predetermined state refers to, for example, a state in which screen switching on the display unit 160 is cancelled. The communication data generation unit 134 stores communication data items determined in advance based on the format of communication data stored in advance in the auxiliary storage unit 120 and generates communication data. The communication data items include a screen switching instruction, data indicating that the switching has been canceled, and the like. These data items will be described later.

  The switching cancel detection unit 136 detects that switching of screen display on the display unit 160 has been canceled. This detection is performed, for example, by determining whether or not a cancel instruction has been input via the input unit 180.

  The display control unit 150 reads data from the main storage unit 110 or the auxiliary storage unit 120 and causes the display unit 160 to display a screen corresponding to the data. When the display control unit 150 displays the screen, the display control unit 150 further displays a predetermined confirmation screen on the display unit 160. In this case, for example, the confirmation screen is displayed so as to overlap the front of the already displayed screen, but the display mode of the screen is not limited to this. Alternatively, the confirmation screen may be displayed so as not to overlap the already displayed screen.

  The input control unit 170 detects information representing a user instruction from data input via the input unit 180. This information includes information for canceling screen switching on the display unit 160, information for confirming screen switching, and the like.

  The PLC 300 controls the operation of the control target device 360 according to a control program stored in advance. The control target device 360 is, for example, an automatic assembly machine or a belt conveyor, but is not limited to a specific device.

  In addition, the apparatus connected to the programmable display 100 is not restricted to the apparatus which controls operation | movement of a control object apparatus like PLC300, What is necessary is just an apparatus which can communicate data between the programmable displays 100. FIG. This apparatus includes, for example, a PC (Personal Computer), a single board computer, a temperature controller, an inverter, and the like. Further, the number of control target devices connected to such an external device is not limited to a specific number.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a block diagram showing a hardware configuration of programmable display device 100 according to the present embodiment.

  As shown in FIG. 2, the programmable display device 100 is connected to the PLC 300 via a network 190. The network 190 is, for example, an in-house LAN (Local Area Network), but is not limited thereto. For example, an intranet, an extra, a VPN (Virtual Private Network), or the like may be used.

  The programmable display device 100 includes a CPU (Central Processing Unit) 210, a graphic controller 220, a display 230, a touch panel controller 240, a touch panel 250, and a video RAM (Random Access Memory) 260, which are connected to each other via a data bus. A RAM 270, a ROM (Read Only Memory) 280, and a communication IF (Interface) 290.

  The CPU 210 functions as the communication data generation unit 134 and the switching cancellation detection unit 136 in FIG. The graphic controller 220 functions as the display control unit 150 in FIG. The display 230 functions as the display unit 160 in FIG. The touch panel controller 240 functions as the input control unit 170 in FIG. The touch panel 250, the keyboard 252, and the mouse 254 function as the input unit 180. The video RAM 260 and RAM 270 function as the main storage unit 110. The ROM 280 functions as the auxiliary storage unit 120. The communication IF 290 functions as the communication control unit 140.

  When a predetermined condition is satisfied, the CPU 210 controls operations by the graphic controller 220, the touch panel controller 240, the video RAM 260, the RAM 270, the ROM 280, and the communication IF 290. The CPU 210 reads data from the video RAM 260 and outputs an instruction to the graphic controller 220 to display a predetermined screen on the display 230. The CPU 210 causes the touch panel controller 240 to acquire data input by the user via the touch panel 250. The CPU 210 temporarily stores the acquired data in the RAM 270. The CPU 210 reads predetermined data or a pre-recorded program from the ROM 280, temporarily stores the data or program in the RAM 270, and executes processing based on the program when predetermined execution conditions are satisfied. CPU 210 communicates with an external device (for example, PLC 300) via communication IF 290. The protocol used for this communication is not particularly limited.

  The touch panel 250 is one of input means, but a keyboard, a mouse, or the like may be used as the input means.

  In addition, the structure of the programmable display 100 is not restricted to said structure. The programmable display device 100 has functions such as an operation panel, a switch, and an indicator lamp for performing graphic display, and various monitors and devices for management such as operation status and work instructions of devices and other controlled devices. It suffices to have a function as a terminal for inputting a set value for.

  With reference to FIG. 2 again, the configuration of the PLC 300 connected to the programmable display device 100 will be described. PLC 300 includes a CPU 310, a memory 320, a communication IF 330, an output IF 340, and an input IF 350.

  The CPU 310 communicates with the programmable display device 100 via the communication IF 330. The data communicated at this time includes an instruction to switch the display of the screen on the programmable display 100, and data indicating the display status of the screen generated by the programmable display 100 (for example, whether or not the switching of the display has been completed). included.

  The CPU 310 communicates with the control target device 360 connected to the PLC 300 via the output IF 340 or the input IF 350. That is, the CPU 310 outputs control information to the control target device 360 via the output IF 340. This control information includes a command for setting control data for the control target device 360 (for example, changing a set value). On the other hand, the CPU 310 receives information representing the state of the control target device 360 via the input IF 350. This information includes, for example, a non-defective product record, a defect record, a cumulative production number, and the like.

  The CPU 310 stores data acquired from the control target device 360 in the memory 320. The CPU 310 reads the data in the memory 320 and transmits it to the programmable display device 100 via the communication IF 330.

  Moreover, as is clear from the above configuration, the programmable display 100 and the PLC 300 are stored in separate housings.

  With reference to FIG. 3, the relationship between the data used by programmable display 100 and the data used by PLC 300 will be described. FIG. 3 is a diagram for explaining the relationship between the data area in the RAM 270 of the programmable display 100 and the data area in the memory 320 of the PLC 300.

  As shown in FIG. 3, the data stored in the RAM 270 and the data stored in the memory 320 are associated with each other. For example, the data “0001” stored in the data area “0ch” of the memory 320 is the same as the data “0001” stored in the data area “0ch” of the RAM 270. These data are synchronized by the programmable display 100 and the PLC 300 communicating based on a predetermined communication protocol. As a method of synchronization, for example, the programmable display 100 is the main body, the data is inquired from the programmable display 100 to the PLC 300, and the response is obtained from the PLC 300 for synchronization. Yes.

  Note that the synchronization method is not limited to this, and the synchronization is performed by transmitting data from the PLC 300 to the programmable display device 100 by installing the communication program in the PLC 300 so that the PLC 300 is the main body. You may take Thus, by making the data in the programmable display 100 and the data in the PLC 300 the same, the programmable display 100 displays a predetermined screen based on the data from the PLC 300, and data corresponding to the screen (for example, It is possible to promptly display data indicating the operating status of the control target device.

  A program stored in the ROM 280 of the programmable display device 100 will be described with reference to FIG. FIG. 4 is a diagram conceptually showing a mode in which ROM 280 stores a program.

  The operating system is stored in the data area D402. This operating system is a program for the CPU 210 of the programmable display device 100 to execute predetermined processing, for example.

  The input control program is stored in the data area D404. For example, this program is a program for acquiring data input by the user via the touch panel 250 and writing the data in the RAM 270 or reading predetermined data from the RAM 270 in response to an instruction input to the touch panel 250.

  The output control program is stored in the data area D406. This program is a program executed by the graphic controller 220 in order to control display of a screen on the display 230. When this program is executed, a predetermined screen is displayed on the display 230 based on the data stored in the video RAM 260.

  The communication control program is stored in the data area D408. This program controls communication between the programmable display device 100 and the PLC 300. The external device to be controlled by the communication control program is not limited to the PLC 300 and may be any device having a communication function. In this case, the communication function can be expanded by changing data used by the communication control program.

  The screen switching control program is stored in the data area D410. This program is a program for switching the screen on the display 230 based on a user instruction input via the touch panel 250 or based on an instruction from the PLC 300 connected to the network 190. When this program is executed, a screen corresponding to the instruction is displayed by the graphic controller 220 based on display data stored in the ROM 280 in advance.

  The cancel detection program is stored in the data area D412. This program is a program for detecting an instruction to cancel display switching when a user inputs a display switching cancel instruction on the user input screen displayed on the display 230. This program is executed as a subroutine while the screen switching control program stored in the data area D408 is being executed, for example.

  The cancel notification program is stored in the data area D414. This program is a program for transmitting data for notifying the PLC 300 and other external devices of the detection when the cancellation is detected by the cancellation detection program. For example, when cancellation by the user is detected, predetermined communication data is generated, and the data is transmitted to the PLC 300 via the communication IF 290.

  With reference to FIG. 5, the data which programmable display 100 concerning this embodiment transmits to PLC300 is explained. FIG. 5 is a diagram showing the structure of communication data for notifying cancellation of screen switching in programmable display 100. In addition, the size of the data item stored in each data area shown below is not particularly limited.

  The display unit number is stored in the data area D424. This number is a display ID or other identification data assigned to each display. This data identifies the transmission source of the communication data.

  The cancel notification bit is stored in the data area D426. The cancel notification bit is data indicating that the instruction from the PLC 300 has been canceled. In this manner, by storing predetermined data in the data area D426, the programmable display device 100 can notify the PLC 300 of the state of the programmable display device 100 in addition to the cancellation.

  Data representing the instruction is stored in data area D428. This data includes, for example, a screen switching instruction, but is not limited thereto.

  The data items included in the communication data are not limited to the above items. Data for specifying an instruction by the PLC 300 and data for specifying a processing state in the programmable display 100 for the instruction may be included. For example, address information on the memory 320 and information indicating display switching cancellation may be used.

  The communication data may include data (for example, a transmission number) that can identify the communication data, for example. In this way, for example, the history of processing in the programmable display 100 can be tracked.

  With reference to FIG. 6, the control structure of CPU210 which implement | achieves the programmable display 100 which concerns on this Embodiment is demonstrated. FIG. 6 is a flowchart showing a procedure of processing executed by CPU 210 when screen switching in programmable display 100 is cancelled.

  In step S502, CPU 210 of programmable display device 100 outputs a display instruction for screen “B1” to graphic controller 220. The graphic controller 220 reads out the data held in the video RAM 260 and outputs it to the display 230. As a result, the screen “B1” is displayed on the display 230.

  In step S504, CPU 210 receives an instruction to switch from PLC 300 to screen “B2”. This switching instruction may be included in, for example, periodic communication performed between the programmable display device 100 and the PLC 300. Alternatively, the data may be included in the data transmitted by the PLC 300 to instruct only the screen switching.

  In step S506, CPU 210 reads attribute data of screen “B2” from RAM 270. The attribute data includes data for displaying the screen “B2” on the display 230 (for example, bitmap data), control data (for example, security level) for controlling access to the screen “B2”, and the like.

  In step S508, CPU 210 outputs a data input screen display instruction to graphic controller 220. When this instruction is output, a data input screen is displayed on the display 230. Here, the data input screen is a screen for the user to input data or instructions used for screen switching control. This data includes a user ID, a password, and the like. The instruction includes pressing of a display such as confirmation and cancellation. Such a display of the screen is performed, for example, in such a manner that it is displayed in a superimposed manner on the front of the screen “B1” that has already been displayed, but is not limited thereto.

  In step S510, CPU 210 determines whether a cancel instruction by the user has been input or not. This determination is made, for example, by detecting whether or not the “cancel” icon included in the data input screen (step S508) is pressed or a specific key (eg “ESC” key) on the keyboard 252 is pressed on the touch panel 250. Is done. Note that the mode of canceling the switching is not limited to these. If it is determined that a cancel instruction has been input (YES in step S510), the process proceeds to step S512. If not (NO in step S510), the process proceeds to step S518.

  In step S512, CPU 210 generates communication data notifying cancellation. For example, CPU 210 temporarily generates a communication data format (FIG. 5) stored in advance in ROM 280 in RAM 270, and generates communication data by inputting a predetermined data item in each data area of the format.

  In step S514, CPU 210 transmits the communication data generated via communication IF 290 to PLC 300. For example, the communication data is transmitted immediately after it is generated. Alternatively, the communication data may be transmitted to the PLC 300 in accordance with communication performed at preset time intervals.

  In step S 516, CPU 210 outputs a display instruction for screen “B 1” to graphic controller 220. The graphic controller 220 reads out the data held in the video RAM 260 and outputs it to the display 230. Accordingly, even if preparation for displaying the screen “B2” (for example, reading of data) is performed, the screen “B1” is reliably displayed on the display 230.

  In step S 518, CPU 210 outputs a display instruction of screen “B 2” to graphic controller 220. The graphic controller 220 reads out the data held in the video RAM 260 and outputs it to the display 230. Accordingly, the screen display is switched from “B1” to “B2” based on the received switching instruction.

  Here, a data structure and a control structure in the PLC 300 will be described below.

  The data stored in the memory 320 of the PLC 300 will be described with reference to FIG. FIG. 7A conceptually represents data stored in the memory 320 when the screen “B1” is displayed on the programmable display 100. FIG. 7B conceptually represents data stored in the memory 320 when the screen “B2” is displayed on the programmable display 100. FIG. 7C conceptually represents data stored in the memory 320 after the display switching in the programmable display device 100 is cancelled.

  As shown in FIG. 7A, data for identifying the programmable display device 100 connected to the PLC 300 (that is, GP001) is stored in the data area D702. Data representing the screen “B1” displayed on the programmable display 100 before outputting the screen switching instruction is stored in the data area D704. In this case, for example, a specific bit is set to “1”. Bit “1” means display of the screen “B1”.

  In the case of FIG. 7A, the data in the memory 320 indicates that the screen “B1” of the screen GP001 (programmable display 100) is displayed.

  When the PLC 300 transmits an instruction to switch the screen display from “B1” to “B2” to the programmable display device 100, the data stored in the memory 320 is changed as shown in FIG. 7B, for example. That is, the bit in the data area D704 is changed from “1” to “0”. Bit “0” means display of the screen “B2”.

  When the screen display switching is canceled, the data stored in the memory 320 is changed as shown in FIG. That is, the data in the data area D704 is changed to the bit “1” indicating the display of the screen “B1”.

  In addition, the aspect which stores the data about the screen displayed on the programmable display 100 is not restricted to said aspect.

  With reference to FIG. 8, the control structure of PLC 300 connected to programmable display 100 according to the present embodiment will be described. FIG. 8 is a flowchart showing a procedure of processing executed when CPU 310 transmits a screen switching instruction. In the following, when a specific bit for screen display is “1”, it means display of the screen “B1”, and when that bit is “0”, it means display of the screen “B2”. explain. Note that the correspondence between the bits and the displayed screen is not limited to this. Further, the following control structure is not unique to the PLC 300, but can be applied to a PC, a single board computer, or other devices having control functions and communication functions.

  In step S702, CPU 310 of PLC 300 transmits an instruction to switch the display screen from “B1” to “B2” to programmable display device 100. The data transmitted at this time may include data for identifying the programmable display 100 and data representing the screen after switching, and the data format is not particularly limited.

  In step S704, CPU 310 changes a predetermined bit of data area D704 of memory 320 from “1” to “0”. As a result, the programmable display 100 displays the screen “B2” on the PLC 300 data.

  In step S706, CPU 310 receives the communication data transmitted from programmable display 100.

  In step S708, CPU 310 determines whether screen switching has been cancelled. This determination is made based on, for example, whether or not the communication data received from programmable display device 100 includes data representing cancellation of switching. If it is determined that the screen switching has been canceled (YES in step S708), the process proceeds to step S710. If not (NO in step S708), the process ends.

  In step S710, CPU 310 obtains the display number (that is, GP001) from the received communication data.

  In step S712, CPU 310 sets a predetermined bit in data area D704 of memory 320 from “0” to “1”. Thereby, the data held by the PLC 300 indicates that the programmable display 100 displays the screen “B1”.

  The operation of the display device according to the present embodiment based on the above-described structure and flowchart will be described with reference to FIGS.

  When the programmable display 100 displays the screen “B1” (step S502), the PLC 300 transmits a display screen switching instruction to the programmable display 100 (step S702), and further, a predetermined area in the data area D704 is displayed. The bit is changed from “1” to “0”. When the programmable display device 100 receives the switching instruction (step S504), the CPU 210 of the programmable display device 100 reads the attribute data of the screen “B2” from the RAM 270 based on the instruction (step S506). If CPU210 outputs the display instruction | indication of a predetermined | prescribed data input screen (step S508), the display 230 of the programmable display 100 will display the data input screen.

  When the user presses “cancel” of switching via touch panel 250, it is determined that an instruction to cancel switching is input based on the pressing (YES in step S510), and communication for notifying PLC 300 of the cancellation. Data is generated (step S512).

  Programmable display 100 transmits the communication data to PLC 300 (step S514), and PLC 300 receives the data (step S516). If communication data includes data indicating that display switching has been canceled (YES in step S708), PLC 300 acquires data for identifying programmable display 100 from the data (step S710). ), The CPU 310 changes a predetermined bit of the data area D704 of the memory 320 from “0” to “1”.

  As described above, when programmable display 100 according to the present embodiment detects cancellation of switching when switching the display screen based on an instruction from PLC 300, communication data for notifying the cancellation is transmitted to PLC 300. To do. Since the communication data includes data for identifying the programmable display 100 and the screen number for which switching is instructed, the PLC 300 changes the data (data area of the memory 320) when the switching instruction is transmitted. 704 data) can be returned to the data before the change. Thereby, the display state of the screen in the programmable display 100 and the management information of the screen of the programmable display 100 in the PLC 300 can be matched.

<Modification of First Embodiment>
Hereinafter, modifications of the present embodiment will be described. The programmable display device 100 according to the present modification differs from the first embodiment described above in that the cancellation of screen switching is performed based on the number of password mismatches input by the user.

  Note that the hardware configuration of the programmable display device 100 according to this modification is the same as that of the first embodiment described above. Their functions are the same. Therefore, detailed description thereof will not be repeated.

  With reference to FIG. 9, data temporarily stored in the RAM 270 of the programmable display device 100 according to the present modification will be described. FIG. 9 is a diagram for explaining data stored in the RAM 270. Such data is read from an area stored in advance and temporarily generated when the screen display is switched based on data received from the PLC 300 as described later, for example.

  The identification data of the programmable display 100 is stored in the data area D902. This identification data is data previously recorded in the ROM 280, for example.

  Data representing the screen “B1” displayed on the display 230 before display switching is stored in the data area D904. This data is data stored in a predetermined data area of the video RAM 260, for example.

  Data representing the screen “B2” displayed after the switching is stored in the data area D906. This data is acquired from the data received from the PLC 300.

  The registered password is stored in the data area D908. This password is data for authenticating the user when the display is switched. This password is recorded in advance in a ROM 280 such as a flash memory.

  The number of times the password is allowed to be input when the screen is switched is stored in the data area D910. The data items stored in the RAM 270 are not limited to the above items.

  As shown in FIG. 9, the programmable display device 100 having the identification data “GP001” indicates that password input is allowed up to three times when the screen is switched from “B1” to “B2”. Therefore, when the password input is unsuccessful three times, it is determined that the switching of the screen is canceled as will be described later.

  With reference to FIG. 10, the control structure of CPU210 which implement | achieves the programmable display 100 which concerns on this modification is demonstrated. FIG. 10 is a flowchart showing a procedure of processing executed by the CPU according to the present modification. The same processes as those in the first embodiment are denoted by the same step numbers, and description thereof will not be repeated here.

  In step S902, the CPU 210 of the programmable display 100 initializes the RAM 270.

  In step S904, CPU 310 reads the registration password from data area D908 of ROM 280 and temporarily stores it in RAM 270.

  In step S906, CPU 310 detects the input of a password by the user. This detection is performed, for example, when the user inputs data via the keyboard 252.

  In step S908, CPU 310 determines whether or not the registered password matches the input password (hereinafter referred to as input password). This determination is made, for example, by comparing these passwords. If it is determined that the registered password and the input password match (YES in step S908), the process proceeds to step S910. If not (NO in step S908), the process proceeds to step S912.

  In step S910, CPU 310 outputs a display instruction for screen “B2” to graphic controller 220. Thereby, the display 230 displays the screen “B2”.

  In step S912, CPU 310 determines whether the number of mismatches between the registered password and the input password has reached the limit number. This determination is made by comparing the preset number of mismatches read out from the data area 910 of the ROM 280 to the RAM 270 and the number of times of actual mismatches. If the number of mismatches has reached the limit number (YES in step S912), the process proceeds to step S512. If not (NO in step S912), the process returns to step S508.

  The operation of the display device according to the present modification based on the above-described structure and flowchart will be described with reference to FIGS. Here, a case will be described in which the password input limit number is three.

  When the PLC 300 transmits an instruction to switch the display screen to the programmable display 100 (Step S702), the programmable display 100 initializes the RAM 270 (Step S902) based on the reception of the instruction (Step S504). The programmable display 100 further reads data for controlling the password limit count and other switching from the ROM 280 and stores it in a predetermined area of the RAM 270 (step S904).

  When the user inputs a password, the input is detected (step S906). If the input password does not match the registered password (NO in step S908), the user is prompted to input the password up to a predetermined number of times. When the number of mismatches is three (YES in step S912), communication data notifying the failure of screen switching is generated (step S512).

  When such communication data is transmitted to the PLC 300 (step S514), the PLC 300 sets a predetermined bit in the data area D704 of the memory 320 to a bit “1” indicating that the screen “B1” is displayed. (Step S714). As a result, the screen “B1” actually displayed on the programmable display 100 matches the display screen data stored in the data area D904 of the memory 320 in the PLC 300. Therefore, PLC 300 can accurately execute the subsequent processing (for example, output of an instruction to display another screen).

<Second Embodiment>
Hereinafter, a second embodiment of the present invention will be described. The programmable display device 1000 according to the present embodiment switches the display of the screen based on the determination as to whether or not the information stored in the user's ID card is legitimate information. It differs from the programmable display 100 which concerns on a form.

  With reference to FIG. 11, the structure of the programmable display 1000 which concerns on this Embodiment is demonstrated. FIG. 11 is a block diagram illustrating an aspect of the configuration of the programmable display device 1000.

  As shown in FIG. 11, the programmable display 1000 includes a hard disk storage device 282 and a card reader 1000 connected to the communication IF 290 in addition to the configuration of the programmable display 100 according to the first embodiment. Including. The card reader 1000 is loaded with an ID card 1010. The ID card 1010 includes a memory (not shown). In this memory, a user ID, a password and other information are recorded in advance. Since other configurations are the same as those of the first embodiment, detailed description thereof will not be repeated.

  When the ID card 1010 is attached to the card reader 1000, the CPU 210 executes predetermined processing, reads data from the card 1010, and stores it in the RAM 270. The CPU 210 further executes a process of authenticating data stored in the RAM 270 to determine whether or not the ID card 1010 is a valid card.

  The ID card 1010 is, for example, a magnetic card or an IC (Integrated Card). However, the ID card 1010 is not limited thereto, and may be any card that can record and read necessary information.

  With reference to FIG. 12, the program stored in ROM280 of the programmable display 100 which concerns on this Embodiment is demonstrated. FIG. 12 is a diagram conceptually showing a program storage mode in a predetermined data area of ROM 280. As will be described later, each program is read into the RAM 270 and executed by the CPU 210 when a predetermined condition is satisfied.

  The card information reading program is stored in the data area D416 of the ROM 280. This program is executed by the CPU 210 when the ID card 1010 is attached to the card reader 1000. When this program is executed, the data stored in the ID card 1010 is read out and temporarily stored in a predetermined data area formed in the RAM 270 of the programmable display 1000.

  The card information authentication program is stored in the data area D418. This program is a program for confirming whether or not the data read from the card is valid. This program is executed by the CPU 210 when a predetermined condition is satisfied.

  With reference to FIG. 13, data used by programmable display 1000 according to the present embodiment will be described. FIG. 13 is a diagram conceptually showing the structure of data stored in hard disk storage device 282 included in programmable display 1000.

  The card number is stored in field F1202. The user ID is stored in field F1204. The user password is stored in field F1206. For example, when a user of the programmable display 1000 is determined, these data are stored in the hard disk storage device 282 in accordance with registration of the user's name and other basic information. Alternatively, user information may be registered or updated as appropriate via the communication IF 290.

  In FIG. 13, for example, a user with a card number “0001” has a user ID “1000001”. The user password is “abcdefg”. In this case, when the user inputs the password “abcdefg” after inputting the ID card 1010, the user is authenticated as a valid user. After this authentication, the screen can be switched effectively, or the user can execute display screen switching and other processes in the programmable display 1000.

  Note that the password may be stored in the ID card 1010 instead of the method in which the user inputs the password. Thereby, for example, when the ID card 1010 is frequently used, the input load by the user can be reduced. In this case, the password stored in the ID card 1010 may have a time limit. In this way, since the password that has passed the expiration date becomes invalid, for example, when the ID card 1010 is lost, unauthorized access can be prevented.

  With reference to FIG. 14, the ID card 1010 mounted on the card reader 1000 will be described. FIG. 14 is a diagram conceptually showing data storage in ID card 1010.

  A card ID for identifying the ID card 1010 is stored in the data area D1402. A user ID for identifying the user of the ID card 1010 is stored in the data area 1404. The user password is stored in the data area D1406. The expiration date of the ID card 1010 is stored in the data area D1408. By setting such an expiration date, even if the ID card 1010 is copied, the influence of unauthorized use can be suppressed.

  The attribute information is stored in the data area D1410. This attribute information includes, for example, the department to which the user belongs, the access level in the programmable display 1000, and other management information.

  Note that data items stored in the ID card 1010 are not limited to the above items. Data is stored on a magnetic tape or in an IC chip, but the storage mode is not particularly limited thereto. Each data item is set, for example, when the ID card 1010 is issued, but the data setting is not limited to this time. For example, data may be updated by a device having a data writing function.

  With reference to FIG. 15, a control structure of CPU 210 that realizes programmable display 1000 according to the present embodiment will be described. FIG. 15 is a flowchart showing a procedure of processing executed by CPU 210. Note that the same step numbers are assigned to the same processes as those in the first embodiment described above, and description thereof will not be repeated here.

  In step S1302, CPU 210 of programmable display 1000 detects that ID card 1010 has been inserted into card reader 1000.

  In step S 1304, CPU 210 reads data from ID card 1010 and temporarily stores it in RAM 270.

  In step S1306, CPU 210 obtains the user ID of ID card 1010 from the data temporarily stored in RAM 270.

  In step S1308, CPU 210 searches hard disk storage device 282 for a registered password corresponding to the acquired user ID.

  In step S1312, CPU 210 determines whether or not the registration password matches the input password. If the registered password and the input password match (YES in step S1312), the process proceeds to step S910. If not (NO in step S1312), the process proceeds to step S512.

  An operation of programmable display device 1000 according to the present embodiment based on the above-described structure and flowchart will be described. The description of the same operation as that according to the first embodiment will not be repeated.

  When the programmable display 1000 is going to switch the screen from “B1” to “B2”, the user inserts the ID card 1010 into the card reader 1000. When the programmable display 1000 detects that an ID card has been inserted (step S1302), data is read from the ID card 1010 and stored in the RAM 270 (step S1304). The programmable display 1000 acquires the user ID of the ID card 1010 from the data (step S1306), further searches the hard disk storage device 282 for the registered password based on the user ID, and reads it into a predetermined area of the RAM 270. .

  Programmable display 1000 cancels the screen switching and notifies PLC 300 of the cancellation when the password entered by the user and the registered password do not match (NO in step S1312). Communication data is generated (step S512). Thereafter, when the communication data is transmitted to the PLC 300, the PLC 300 returns the screen information to the information before the output of the change instruction.

  As described above, the programmable display device 1000 according to the present embodiment acquires authentication information for determining whether or not to switch screens from the ID card 1010 attached to the card reader 1000. The programmable display 1000 is data corresponding to the user ID of the ID card 1010 and searches the ROM 280 for a preset registration password. The programmable display device 1000 switches the screen when the password input by the user matches the registered password. On the other hand, if the data do not match, programmable display 1000 transmits to PLC 300 communication data notifying that the screen switching has been cancelled.

  In this way, since the PLC 300 can always maintain the data indicating the screen number displayed on the programmable display 1000 to the latest data, control based on the displayed screen (for example, to other related screens). Display display, display details of display data, etc.) can be executed with high accuracy.

  Each user can input information necessary for authentication by inserting the ID card 1010 into a predetermined card reader 1000 instead of directly inputting data. Accordingly, it is possible to suppress the occurrence of an erroneous operation such as a password input error.

<Modification of Second Embodiment>
Hereinafter, modifications of the present embodiment will be described. In the second embodiment, the programmable display device 1000 acquires authentication information for controlling display switching from the ID card 1010. Thus, instead of the method of acquiring data stored in advance in the card as authentication information, the biometric information of each user may be used as authentication information. For example, information such as a user's fingerprint, voiceprint, signature, and iris may be used as authentication information.

  In this case, the user inputs the user ID and his / her own biological information when switching the display of the screen or changing the setting of the data item being displayed. For example, when a fingerprint is used as biometric information, when the user places a finger on a predetermined authentication device, the fingerprint is read as data for authentication. The programmable display device searches for a registered fingerprint, which is authentication information registered in advance based on the user ID. A process of comparing the registered fingerprint with the read fingerprint is executed, and if the fingerprints match, it is determined that the user is a properly registered user. In this case, subsequent processing can be executed effectively. On the other hand, if they do not match, it is determined that the user is not a registered user, and the authentication process is executed again or the execution of the subsequent process is stopped.

  This eliminates the need for each user to carry an ID card, thereby preventing authentication from being hindered due to card loss, duplication, or other unforeseen circumstances. Moreover, since such biometric information is difficult to be owned by another person, unauthorized access due to so-called “spoofing” or the like can also be prevented.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a functional block diagram of the display which concerns on embodiment of this invention. It is a block diagram showing the indicator and PLC which concern on the 1st Embodiment of this invention. It is a figure for demonstrating the relationship of the data of RAM and memory shown in FIG. It is a figure for demonstrating the program stored in ROM shown in FIG. It is a figure showing the structure of the data which the indicator shown in FIG. 2 transmits to PLC. It is a flowchart showing the control structure of the indicator which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the data stored in the memory of PLC shown in FIG. 3 is a flowchart showing a control structure of the PLC shown in FIG. It is a figure for demonstrating the data stored in ROM280 of the display which concerns on the modification of the 1st Embodiment of this invention. It is a flowchart showing the control structure of the indicator which concerns on the modification of the 1st Embodiment of this invention. It is a block diagram showing the indicator and PLC which concern on the 2nd Embodiment of this invention. It is a figure for demonstrating the program stored in ROM shown in FIG. It is a figure for demonstrating the data stored in the hard-disk apparatus shown in FIG. It is a figure for demonstrating the data memorize | stored in the ID card with which the card | reader shown in FIG. 11 is mounted | worn. It is a flowchart showing the control structure of the indicator which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

  100, 2000 Display, 110 Main storage unit, 120 Auxiliary storage unit, 134 Communication data generation unit, 136 Switching cancel detection unit, 140 Communication control unit, 142 External device, 150 Display control unit, 160 Display unit, 170 Input control unit , 180 input unit, 190 communication network, 210, 310 CPU, 220 graphic controller, 230 display, 240 touch panel controller, 250 touch panel, 252 keyboard, 254 mouse, 260 video RAM, 270 RAM, 280 ROM, 282 hard disk device, 290, 330 communication IF, 300 PLC, 320 memory, 340 output IF, 350 input IF, 360 control target device, 1000 card reader, 1010 ID card.

Claims (2)

A control device connected to the control target device and controlling the operation of the control target device; a function of displaying the state of the control target device via the control device; and a function of instructing control of the operation of the control target device A display control system comprising a programmable display having
The programmable display is
Display means capable of switching and displaying a plurality of screen data;
Input means for making inputs to the programmable display;
First storage means for storing screen data displayed on the display means;
First control means for controlling the operation of the programmable display,
The controller is
Second storage means for storing screen identification data corresponding to the screen data displayed on the display means;
Second control means for controlling the operation of the control device and obtaining state data representing the state of the device to be controlled;
The controller is
With the first screen data of the plurality of screen data being displayed on the display means, the second control means changes the display on the display means from the first screen data to the second screen data. When the screen switching instruction to switch to, when sending the screen switching instruction to the programmable display,
In the second storage means, the first screen identification data corresponding to the first screen data is changed to the second screen identification data corresponding to the second screen data,
The programmable display is
A cancel instruction for canceling the screen switching instruction is included in the determination information for determining whether to accept the screen switching instruction with respect to the screen switching instruction input from the input unit and received from the control device. If included, send the cancel instruction to the control device;
The controller is
In response to the received cancel command, the display control system changes the second screen identification data stored in the second storage means to the first screen identification data.   The display control system according to claim 1, wherein the display unit displays a screen requesting input of an instruction as to whether or not to cancel the display change based on the screen switching instruction.

Images