JP2012128720A - Client computer, programmable display, data display system and programs thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a client computer to display data different from the one in a programmable display, while displaying the same image as the programmable display.SOLUTION: A programmable display 2 and a client computer 3 which are able to communicate with each other, display a same image. The programmable display 2 displays data acquired from a PLC 5 ([PLC1], for example) specified by a device ID which is stored in a working memory 28, on the image. On the other hand, the client computer 3 acquires data acquired from the PLC 5 ([PLC2], for example) specified by a device ID which is stored in a working memory 35 (different from the device ID in the working memory 28) from the programmable display 2 and displays it on the image.

Description

  The present invention relates to a client computer that is communicably connected to a programmable display and configured to display the same image as that displayed on the programmable display, and further includes a programmable display, the client computer, and The present invention relates to a data display system including a programmable display and a program thereof.

  The programmable display device includes a screen for displaying an image, a touch panel for touch input, an interface for communication with a connected device, and a control unit for controlling the above-described units. Such a programmable display is an operation-type display that has a function of displaying an operation status of an apparatus on an image displayed on a screen and receiving an operation input for giving a control instruction to the apparatus from a touch panel on the screen. It is a vessel.

  In general, since the programmable display device has a graphic display function, an operation panel, a switch, an indicator lamp, and the like can be displayed on an image prepared in advance, and serves as an operation terminal in the control system. In the control system, the display of the operating status of each device and the control instruction to the device are performed by a programmable display arranged near the device.

  In the programmable display as described above, an image displayed on the programmable display is displayed on a personal computer (PC) at a location away from the site where the programmable display is installed, and the image is operated by the PC. Some have a remote monitoring function. For example, Patent Document 1 describes a network control system that displays an image representing the operating status of each participating station on a programmable display or PC connected to the network as a participating station. In each participating station, by operating a button provided in the above image, the network status between the participating stations is displayed on the image.

JP 2006-53743 (released February 23, 2006)

  In the above network control system, only the same image as that displayed on the programmable display can be displayed on the PC. For this reason, when the programmable display is displaying the image about the apparatus connected to a certain PLC, the image about the same kind of apparatus connected to PLC different from the said PLC cannot be displayed on PC.

  For this reason, it is necessary to create a plurality of similar images, and the man-hours for that are increased. In addition, a large amount of memory capacity for storing images in the programmable display is consumed, and the storage capacity of other images is reduced.

  The present invention has been made in view of the above-described problems, and an object thereof is to display data different from the programmable display while displaying the same image as the programmable display on the client computer.

  The client computer according to the present invention is connected to the programmable display so as to be able to communicate with each other, and obtains and displays the same image as the image displayed on the programmable display from the programmable display, and displays the same on the programmable display. In a client computer configured to display data acquired from any one of a plurality of connected devices on the image, the programmable display is provided with the programmable display in order to solve the above-described problem. When the data acquired by communicating with one of the connected devices specified by the display-side ID stored in the internal memory is displayed on the image, the other one of the connected devices is specified. Client-side ID set on the client computer in order to Client-side internal memory for storing, client means for requesting and acquiring the data acquired by the programmable display by communicating with the connected device specified by the client-side ID, and the client means And a client-side display processing means for displaying the data acquired in (1) on the image.

  The programmable display which concerns on this invention is a programmable display which displays the data acquired from either of several connection apparatuses on an image, Comprising: The client computer which acquires and displays the same image as the said image from a programmable display In a programmable display connected to be communicable with each other, in order to solve the above problem, a display-side ID set in the programmable display to identify one of the connected devices is a predetermined address. A display-side internal memory stored in the display-side, display-side display processing means for displaying the data acquired by communicating with the connection device specified by the display-device-side ID in the image, Store the client side ID set in the client computer to identify another one at a predetermined address Request from the client computer comprising a client-side internal memory and a client-side display processing means for displaying the data acquired by the programmable display communicating with the connected device specified by the client-side ID on the image And server means for transmitting the data to the client computer.

  In addition, a data display system according to the present invention includes a programmable display and a client computer that are communicably connected to each other, and the client computer displays the same image as the image displayed on the programmable display. In order to solve the above-mentioned problem, in a data display system that acquires and displays from a display device and displays data acquired from any of a plurality of connected devices connected to the programmable display device on the image A display-side internal memory for storing, at a predetermined address, a display-side ID set in the programmable display for the programmable display to identify one of the connected devices, and the display-side The data acquired by communicating with the connected device specified by the ID is added to the image. Display side display processing means for displaying, and the client computer stores a client side ID set in the client computer at a predetermined address in order to identify another one of the connected devices Side internal memory, client means that the programmable display communicates with the connected device specified by the client-side ID to acquire the data obtained by requesting the programmable display, and acquired by the client means Server-side display processing means for displaying the data on the image, and further, the programmable display device transmits the data to the client computer in response to a request from the client means of the client computer. Be equipped It is characterized in that.

  In any of the above configurations, in the programmable display, data acquired from the connected device specified by the display-side ID stored in the display-side internal memory is displayed on the image by the display-side display processing means. The On the other hand, in the client computer, the client means requests data from the programmable display. In the programmable display, in response to this request, data acquired from another connected device specified by the client-side ID stored in the client-side internal memory is transmitted from the server means to the client computer, and the client-side display The image is displayed on the image by the processing means.

  Thereby, different data can be displayed on each image, while the programmable display device and the client computer display the same image. This is because the programmable display device stores the display-side ID, while the client computer stores the client-side ID, and indirectly designates a different connected device for each ID. Therefore, it is only necessary to prepare one common image for displaying the data of the connected device.

  The client program of the present invention is a program for causing a computer to function as the client-side display processing means and the client means in the client computer. Thus, a client computer can be realized by causing a computer to read and execute a client program.

  The server program of the present invention is a program for causing a computer to function as the display-side display processing means and the server means in the programmable display. Thus, a programmable display is realizable by making a computer read and run a server program.

  The data display program of the present invention is a program for causing a computer to function as the display-side display processing means, the client-side display processing means, the client means, and the server means in the data display system. Thus, a data display system can be realized by causing a computer to read and execute a data display program.

  Since the client computer, programmable display device, and data display system according to the present invention are configured as described above, the number of steps for creating an image can be greatly reduced, and a memory for storing the image There is an effect that the capacity can be reduced.

It is a block diagram which shows the structure of the control system which concerns on Embodiment 1 of this invention. It is a flowchart which shows the procedure of the process which switches PLC in the said programmable display and displays data. It is a transition diagram which shows the communication processing between the said programmable display in the said control system, and a client computer. It is a flowchart which shows operation | movement of the said client computer in synchronous mode and asynchronous mode. It is a figure which shows operation | movement of the said programmable display and the said client computer in synchronous mode and asynchronous mode. (A) thru | or (c) is a figure which shows the state which switches the temperature controller as a connection apparatus in the programmable display of the said control system, and displays the temperature data of the said temperature controller on a single temperature monitor image. is there.

  One embodiment of the present invention is described below with reference to FIGS.

[1. (Control system configuration)
As shown in FIG. 1, a control system 1 (data display system) according to the present embodiment includes a programmable display 2, a client computer 3, a network 4, and a plurality of programmable logic controllers 5 (hereinafter referred to as “PLC 5”). ) And a plurality of devices 6.

  The programmable display 2 is connected to the client computer 3 via the network 4. The network 4 is a communication network including a local area network (LAN) that can communicate with a common communication protocol (common communication protocol) and the Internet, and the Internet. .

[1-1. Configuration of PLC]
The PLC 5 captures data generated by the device 6 and gives a control instruction (operation command or set value) to the device 6. The PLC 5 performs the above operation at every predetermined scan time such as several tens of ms, for example, according to a sequence program (such as a ladder program) created by the user. The PLC 5 performs serial communication or network communication with the programmable display 2.

  The memory 51 in the PLC 5 stores data (word data and bit data) indicating the state of the device 6 (data of the device 6 and a set value for the device 6) in an area specified by the device address. In the memory 51, a word device and a bit device are set. The word device is set as an area for storing word data such as numeric values as input / output data, and is designated by a word address (device address). The bit device is set as an area for storing bit data such as an on / off state, and is set by a bit address (device address). Thus, by specifying a device address and accessing an arbitrary word device or bit device in the memory 51, the device 6 can be controlled and the data of the device 6 can be individually taken out.

  As the device 6, a controller such as a temperature controller or an inverter is used. The device 6 includes devices such as sensors that can acquire word data (temperature sensors, optical sensors, etc.) and switches that can acquire bit data (push button switches, limit switches, pressure switches, etc.). Used.

[1-2. Programmable display configuration
[1-2-1. (Basic function of programmable display)
The programmable display device 2 includes a CPU (Central Processing Unit) that executes instructions of an HMI control program that realizes each function. The programmable display 2 is a storage device (recording device) such as a ROM (Read 0nly Memory) that stores an HMI control program, a RAM (Random Access Memory) that develops the HMI control program, and a memory that stores the HMI control program and various data. Medium).

  The programmable display 2 is a dedicated computer that realizes an operation function and a display function unique to the programmable display by displaying image data used for input operation and display, and is preferably used as an HMI device. The image data is created by combining process definition information that defines various processes related to input operations and display operations. The programmable display device 2 can specify the operation of displaying the data of the device 6 and the operation of controlling the device 6 according to the input operation based on the processing definition information included in such image data.

[1-2-2. Configuration of each part of the programmable display]
In order to realize the above functions, the programmable display 2 includes an HMI processing unit 21, a screen 22, a touch panel 23, interface units (I / F in the figure) 24 and 25, a data memory 26, a user, A memory 27 and a work memory 28 are provided. Hereinafter, each main part of the programmable display device 2 will be described in detail.

[1-2-2 (1). (Display / input configuration)
As the screen 22 constituting the display unit, a flat panel display panel such as a liquid crystal panel, an EL panel, or a plasma display panel is preferably used in order to form the programmable display 2 thinly. The touch panel 23 constituting the input unit is an input device provided for performing touch input on the display surface of the screen 22.

[1-2-2 (2). Configuration of interface section]
The interface unit 24 is a communication control unit for the programmable display device 2 to communicate with the client computer 3, and is connected to the network 4. The interface unit 24 is configured to be able to perform network communication based on the IP address of the client computer 3.

  On the other hand, the interface unit 25 is a communication control unit for the programmable display device 2 to communicate with the PLC 5. The interface unit 25 is configured to perform serial communication control when the PLC 5 is a model that performs serial communication, and to perform network communication control when the PLC 5 is a model that performs network communication. The interface unit 25 performs communication using a communication protocol corresponding to the manufacturer and model of the PLC 5 when performing serial communication control.

[1-2-2 (3). (Configuration of various memories)
(A) Data memory The data memory 26 is composed of SRAM or DRAM, and stores data such as data obtained from the device 6 and operation log data generated by the programmable display 2. Since the data memory 26 stores different types of data as described above, the data memory 26 is not necessarily constituted by a single memory. For example, the data memory 26 is preferably composed of different types of memory depending on the type of data, or even if the memory is the same, the storage area is preferably made different depending on the type of data.

(B) User memory The user memory 27 is a memory for storing image data, device setting data, and the like, and FEPROM (Flash Erasable and Programmable ROM) is used. Since FEPROM is a rewritable read-only flash memory, it plays the role of a hard disk drive in a general personal computer. A flash memory does not have a movable part and is resistant to impacts, and thus operates stably even in a poor ambient environment.

<image data>
The image data is an image file in which data of one or more user images (unit images composed of image data for one frame) displayed on the programmable display device 2 are collected. As image data, a series of related image data corresponding to a target system, a product manufactured by the target system, and the like are usually prepared as a set of project files. The project file includes device setting data related to image data and is created by image creation software. This project file is transferred to the programmable display 2 from a personal computer in which image creation software is installed.

  Further, the image data is configured by arrangement of component images on the base image, drawing of graphics, description of text, and the like. As part images, switches (on / off switches, changeover switches, push button switches, etc.), lamps, numeric keys, various display parts (data display parts, meter display parts, graph display parts, alarm display parts, etc.) are created. Provided with the software. In the component image, the processing content for realizing the function is set as the above-mentioned processing definition information.

  For example, in the switch component image, when a touch operation is performed, processing specification information that defines the processing content of rewriting a value designated by a desired address between “0” and “1” is generated. It is preset by software. In addition, processing definition information that defines processing details for displaying data specified by a desired address is set in advance by the image creation software in the image of the data display component.

<Device setting data>
The device setting data is various data set for the programmable display device 2 to exchange data by communicating with the PLC 5. As the device setting data, a device name, a device ID, a data acquisition address, a device designation address, and an initial ID are prepared.

  The device name is a name of a device (node device) that is directly connected to the programmable display 2 and is registered in advance as a connectable device. Node devices can be added by performing a predetermined operation. For the PLC 5, for example, device names such as [PLC1], [PLC2],... Are assigned.

  The device ID is assigned to identify each node device. For example, device IDs are sequentially assigned to n devices such as 1, 2, 3,..., N.

  The data acquisition address is an address at which data acquired in a memory provided in each node device is stored.

  The device designation address (address) is provided for specifying a memory area for inputting the device ID. As this memory area, a freely usable area other than the area used for the operation of the programmable display 2 and system management is allocated.

  The initial ID is a device ID that identifies a device that performs communication when the programmable display device 2 is activated.

(C) Work memory The work memory 28 is constituted by, for example, a DRAM, and is used for temporary storage of data exchanged with the PLC 5 in addition to being used for work during arithmetic processing such as display control. . The work memory 28 (display-side internal memory) includes an area that can be freely used by the user. This area is assigned as the memory area for inputting the device ID set in the programmable display 2. Also good. In the following description, it is assumed that a device designation address is set in the work memory 28. As the device designation address, for example, a fixed address such as [#INTERNAL] LS100 is used. Here, [#INTERNAL] represents an area of the internal memory of the programmable display 2.

  The work memory 28 also includes a VRAM that develops an image to be displayed on the screen 22. In this VRAM, the image data image output from the user memory 26 is stored as dot data in the order of display in the horizontal direction.

[1-2-2 (4). Configuration of HMI processing unit]
The HMI processing unit 21 includes a display communication processing unit 211, an ID change unit 212, an ID change determination unit 213, and a server unit 214.

(A) Configuration of Display Communication Processing Unit The display communication processing unit 211 (display side display processing means) communicates with a specific PLC 5 at every predetermined time interval or every predetermined event, and stores it in the memory 51 of the PLC 5. Get stored data. The display communication processing unit 211 writes the data thus acquired in a specific area in the data memory 26.

  Further, the display communication processing unit 211 acquires the data written in the data memory 26 and displays it in a predetermined area (for example, a data display component image) in the image displayed on the screen 22. The display communication processing unit 211 communicates with the PLC 5 to acquire data, and executes a series of processes for reflecting the state of the data on the above-described region in the image as a display scan.

  Further, the display communication processing unit 211 transmits a control instruction or the like to the PLC 5 in response to an input operation performed on the touch panel 23 on the image displayed on the screen 22. The control instruction includes an operation command and data setting.

  The display communication processing unit 211 performs an operation for acquiring data from the PLC 5 and reflecting it in the display state of the component image in the image, and an operation for giving a control instruction to the PLC 5 according to an operation on the component image. It is specified by the processing rule information defined in the above.

  Note that the PLC 5 data acquisition and control instruction change may be performed each time or separately. In the case of performing separately, a temporary memory space is prepared in the programmable display 2 and, when obtaining / changing, the memory space is accessed and communicated with the PLC 5 at every predetermined time interval or every predetermined event. Synchronize with the entity to which the address is assigned.

  In response to a request from the client computer 3, the display communication processing unit 211 transmits the image data developed in the work memory 28 to the client computer 3 through the server unit 214. In addition, the display communication processing unit 211 is programmable when the display content of the image is synchronized (displays the same data) between the programmable display 2 and the client computer 3 in response to a request from the client computer 3. The same data as the data currently displayed on the device 2 is transmitted to the client computer 3 through the server unit 214.

  The display communication processing unit 211 responds to a switching request to be described later from the client computer 3 when the programmable display 2 and the client computer 3 are in an asynchronous mode in which the display contents of the image are not synchronized (display different data). For this reason, the display communication processing unit 211 performs communication by switching the PLC 5 from which data currently displayed on the client computer 3 is acquired to another designated PLC 5. In addition, the display communication processing unit 211 transmits data acquired from the PLC 5 whose communication has been switched to the client computer 3 through the server unit 214.

  The display communication processing unit 211 has a function of acquiring data of another PLC 5 whose connection has been switched from the PLC 5 from which the data currently displayed on the programmable display 2 is acquired, and switching and displaying the data in a single image. The display communication processing unit 211 includes a display switching unit 211a and a communication switching unit 211b in order to realize this function.

<Display switching section>
The display switching unit 211a (display switching unit) inquires of the ID change determination unit 213 whether there is a change in the value of the device ID at the above-described device designation address at the end of the display scan. When the display switching unit 211a receives a change notification that the value of the device ID has changed from the ID change determination unit 213 as a result of the inquiry, the display switching unit 211a sends a display switching request to switch to display corresponding to the changed device ID to the display communication processing unit 211. Issue. Also, the display switching unit 211a does not issue a display switching request when it does not receive a change notification from the ID change determination unit 213. The display communication processing unit 211 receives the above display switching request and updates the display in the next display scan.

<Communication switching unit>
Upon receiving the change notification, the communication switching unit 211b receives an access ticket provided from the ID change determination unit 213, and issues a communication switching request for switching the communication partner device to the display communication processing unit 211. Here, the access ticket is information on a device designation address, that is, a device ID. The display communication processing unit 211 performs communication by switching devices based on the access ticket in the next display scan.

(B) Configuration of ID changing unit Upon receiving a predetermined instruction, the ID changing unit 212 inputs (changes) the device ID of the device designated address in accordance with the instruction. The above instruction is given, for example, when the user performs a touch operation on the image for directly changing the value of the device ID or selecting the device or the type (name) of data to be acquired.

(C) Configuration of ID Change Determination Unit The ID change determination unit 213 responds to an inquiry from the display switching unit 211a and the client unit 34 (to be described later) of the client computer 3 at the end of the display scan, and the device ID of the device designation address It is determined whether the value of has changed. The ID change determination unit 213 previously copies the device ID written in the device designation address in the previous setting to another area of the work memory 28, and at the time of the determination, the device ID and the device ID of the device designation address are used. Compare. As a result of the comparison, the ID change determination unit 213 determines that the value of the device ID has not changed when they match, and determines that the value of the device ID has changed when they do not match. In addition, the ID change determination unit 213 gives a device ID mismatch determination result as a change notification to the display switching unit 211a and the communication switching unit 211b, and changes the access ticket to the changed device ID to change the communication switching unit 211b. To give.

(D) Server Unit The server unit 214 (server unit) provides image data to the programmable display 2 by performing FTP (File Transfer Protocol) communication with the client unit 34 of the client computer 3. In addition, the server unit 214 performs processing for accepting an operation on an image, a data acquisition request, or the like from the client computer 3 by RPC (Remote Procedure Call) connection. Specifically, the server unit 214 accepts access from the client computer 3, acquires the image data developed on the VRAM of the working memory 28 by the display communication processing unit 211 from the display communication processing unit 211, and receives each client. Send to computer 3. In addition, the server unit 214 receives the operation content operated on the image displayed on the client computer 3 and causes the display communication processing unit 211 to execute the operation, or the PLC 5 data acquired by the display communication processing unit 211 is transmitted to the client computer. Or send to 3.

  In the synchronous mode, the server unit 214 receives an inquiry from the client computer 3 and inquires of the ID change determination 213 whether the device ID has changed. The server unit 214 receives the determination result of the ID change determination 213 and notifies the client unit 34 of the presence or absence of the change. In particular, in the synchronous mode, the server unit 214 transmits the value of the device ID to the client unit 34 together with the change notification when the device ID has changed.

  On the other hand, the server unit 214 transmits the data obtained from the display communication processing unit 211 to the client computer 3 in response to a request from the client computer 3 in the asynchronous mode.

  The server unit 214 has a VNC (Virtual Network Computing) server function applied to, for example, a general personal computer in order to perform the above processing.

[1-2-2 (5). Realization form of HMI processing unit]
The HMI processing unit 21 configured as described above is a functional block realized by causing the aforementioned CPU provided in the programmable display 2 to execute the aforementioned HMI control program (data display program, server program). The program code (execution format program, intermediate code program, source program) of the HMI control program can be recorded on a computer-readable recording medium configured to be separable from the programmable display device 2. The program code may be installed in the programmable display device 2 from the recording medium.

  As the recording medium, for example, a tape-type, disk-type, or semiconductor memory-type medium can be used. As the tape medium, a magnetic tape, a cassette tape or the like is used. Disk media include magnetic disks such as floppy (registered trademark) disks / hard disks, CD-ROM (compact disc read-only memory) / MO (magneto-optical) / MD (Mini Disc) / DVD (digital versatile disk). / Includes optical discs such as CD-R (CD Recordable). The semiconductor memory system is a card system such as an IC card (including a memory card) / optical card, or a mask ROM / EPROM (erasable programmable read-only memory) / EEPROM (electrically erasable and programmable read-only memory) / flash. ROM or the like is used.

  Further, since the programmable display device 2 is connected to the network 4, the HMI control program may be downloaded via the network 4. The network 4 is not limited to the above-described Internet or LAN, and an intranet or an extranet can be used. As the network 4, ISDN (integrated services digital network), VAN (value-added network), CATV (community antenna television) communication network, virtual private network, telephone line network, mobile communication network, satellite A communication network or the like can also be used. The transmission medium constituting the network 4 is not particularly limited. For example, IEEE (institute of electrical and electronic engineers) 1394, USB, power line carrier, cable TV line, telephone line, ADSL (asynchronous digital subscriber loop) line Wired such as may be used. Alternatively, as the transmission medium, infrared data such as IrDA (infrared data association) and remote control, Bluetooth (registered trademark), 802.11 wireless, HDR (high data rate), mobile phone network, satellite line, terrestrial digital network It can also be used wirelessly.

  However, when the HMI control program is downloaded from the network 4 in this way, the download program may be stored in the programmable display 2 in advance or installed from another recording medium.

[1-3. (Basic function of client computer)
The client computer 3 is configured by a general-purpose personal computer, and client software is installed to display an image displayed by the programmable display device 2. The client computer 3 can display not only the same image as the image displayed by the programmable display but also the data of different devices 6 while displaying the same image.

[1-3-1. Configuration of each part of client computer]
The client computer 3 includes a display processing unit 31, an ID change unit 32, an ID change determination unit 33, a client unit 34, a work memory 35, and a cache memory 36 in order to realize the above functions. Yes. Hereinafter, each main part of the client computer 3 will be described in detail.

[1-3-1 (1). Configuration of display processing unit]
The display processing unit 31 (client-side display processing means) performs a process of displaying an image on a display device (not shown) of the client computer 3 based on the image data acquired from the programmable display 2 via the client unit 34. Do. Further, the display processing unit 31 requests the programmable display 2 to transmit data of the PLC 5 specified by the device ID through the client unit 34 based on the device ID acquired from the programmable display 2.

  The display processing unit 31 performs processing for reflecting the data of the PLC 5 acquired from the programmable display device 2 via the client unit 34 on the image. Further, the display processing unit 31 passes the operation content by the user on the image to the client unit 34 so as to transmit the operation content to the programmable display device 2.

  The display processing unit 31 has a function of acquiring data of another PLC 5 whose connection has been switched from the PLC 5 from which the data currently displayed on the client computer 3 is acquired, and switching and displaying the data in a single image. The display processing unit 31 includes a display switching unit 31a in order to realize this function.

  The display switching unit 31a inquires of the ID change determination unit 33 whether or not there is a change in the value of the device ID at the above-described device designation address at the end of the display scan. When the display switching unit 31a receives a change notification that the value of the device ID has changed from the ID change determination unit 33 as a result of the inquiry, the display switching unit 31a issues a switching request to switch to display corresponding to the changed device ID. The changed device ID is passed to the client unit 34. The display switching unit 31a does not issue a switching request when it does not receive a change notification from the ID change determination unit 33.

  When the display processing unit 31 receives the data of the PLC 5 switched from the programmable display device 2 in the state of receiving the switching request, the display processing unit 31 updates the display in the next display scan based on the data.

[1-3-1 (2). Configuration of ID change unit]
When receiving a predetermined instruction, the ID changing unit 32 inputs (changes) the apparatus ID of the apparatus designated address in accordance with the instruction. For example, the above-described instruction is obtained when the user of the client computer 3 directly performs an input operation on the image for directly changing the value of the device ID or selecting the device or the type (name) of data to be acquired. Given. Further, the ID changing unit 32 writes and sets the initial ID acquired from the programmable display device 2 in the device designation address of the work memory 35. Further, the ID changing unit 32 also performs a process of copying a device ID stored in a cache memory 36 described later to a device designation address in the work memory 35.

[1-3-1 (3). Configuration of ID change determination unit]
The ID change determination unit 33 determines whether or not the value of the device ID of the device designation address has changed in response to an inquiry from the display switching unit 31a at the end of the display scan. The ID change determination unit 33 copies the device ID written in the device designation address in the previous setting to another area of the work memory 35 in advance, and at the time of determination, the device ID and the device ID of the device designation address are used. Compare. As a result of the comparison, the ID change determination unit 33 determines that the value of the device ID has not changed when they match, and determines that the value of the device ID has changed when they do not match. Further, the ID change determination unit 33 gives the result of device ID mismatch determination to the display switching unit 31a as a change notification, reads the device ID from the work memory 35, changes the access ticket to the changed device ID, and switches the display. To part 31a.

[1-3-1 (4). (Configuration of client part)
The client unit 34 (client means) acquires the image data transmitted from the programmable display device 2 and transfers it to the display processing unit 31 by performing FTP communication with the server unit 214 described above. Further, the client unit 34 causes the operation content to be reflected in the image data of the programmable display 2 on the image displayed on the client computer 3 by RPC connection with the server unit 214. The client unit 34 has the above-described VNC client function in order to perform the above processing.

  In the synchronous mode, the client unit 34 receives an instruction from the display processing unit 31 and inquires of the server unit 214 whether there is a change in the ID device. Upon receiving the change notification from the server unit 214 and the changed device ID, the client unit 34 writes the device ID at a predetermined address in the cache memory 36. Further, the client unit 34 requests the server unit 214 to transmit the data of the PLC 5 designated based on the device ID, receives the data transmitted from the server unit 214 in response to the request, and displays the display processing unit. Forward to 31.

  On the other hand, the client unit 34 does not make the above inquiry in the asynchronous mode, but transmits the switching request from the display switching unit 31a and the changed device ID to the server unit 214. In addition, the client unit 34 receives data transmitted from the server unit 214 in response to the transmitted switching request and transfers the data to the display processing unit 31.

[1-3-1 (5). Implementation of each part of client computer]
The display processing unit 31, the ID changing unit 32, the ID change determining unit 33, and the client unit 34 configured as described above are CPUs in which the client computer 3 includes a client program for causing a general-purpose personal computer to function as the client computer 3. It is a functional block realized by making it execute. The program code (execution format program, intermediate code program, source program) of the display processing program can be recorded on a computer-readable recording medium configured to be separable from the client computer 3. The program code may be installed in the client computer 3 from the recording medium. The recording medium is the same as the recording medium used in the HMI processing unit 21.

[1-3-1 (6). Configuration of working memory and cache memory]
(A) Work memory The work memory 35 is composed of, for example, a DRAM, and is used for work at the time of arithmetic processing such as display control, and also temporarily stores data exchanged with the programmable display 2. Used for. Further, the work memory 35 (client-side internal memory) includes an area that can be freely used by the user, and this area may be allocated as the memory area for inputting the device ID. In the following description, it is assumed that a device designation address is set in the work memory 35. The work memory 35 also includes a VRAM that develops an image to be displayed on the client computer 3.

(B) Cache Memory The cache memory 36 is provided for storing a device ID acquired from the programmable display 2 via the client unit 34. In the synchronous mode, the device ID stored in the cache memory 36 is copied to the work memory 35. By storing the device ID in the cache memory 36, the device ID in the work memory 35 can be updated at high speed when necessary.

[2. (Data display operation when switching the connected device of the programmable display)
Here, the data display operation when the PLC 5 is switched in the programmable display device 2 will be described with reference to the flowchart of FIG.

  First, when the programmable display device 2 is activated, a display scan by the display communication processing unit 211 is started (step S1). At this time, based on the initial ID of the device setting data, the display communication processing unit 211 performs communication with the PLC 5 specified by the initial ID (step S2). Thereby, the data acquired from the PLC 5 is displayed on the image.

  Next, when a series of display processing of the image is performed and the display scan is completed, an inquiry from the display switching unit 211a is received, and the ID change determination unit 213 determines whether or not the value of the device ID of the device designation address has changed. Is determined (step S3). Here, if it is determined that the value of the device ID has changed, a change notification is given from the ID change determination unit 213 to the display switching unit 211a and the communication switching unit 211b, and a new access ticket is given to the communication switching unit 211b. Given, the next display scan is started (step S4).

  In this display scan, the display communication processing unit 211 communicates with the PLC 5 specified by the changed device ID value (step S5). At this time, desired data is acquired from the data acquisition address in the memory 51 of the PLC 5 and written into the data memory 26. Then, the display communication processing unit 211 switches the display of data on the image in accordance with the data obtained from the PLC 5, whereby the data is displayed on the image (step S6).

  On the other hand, if it is determined in step S3 that the value of the device ID has not changed, no change notification is given from the ID change determination unit 213 to the display switching unit 211a and the communication switching unit 211b. In this state, the next display scan is started (step S7). In this display scan, the PLC 5 that is the communication partner is the same as in the previous display scan, so that the display communication processing unit 211 displays the data acquired by communicating with the same PLC 5 on the image ( Step S8).

[3. Communication processing between programmable display and client computer)
The programmable display 2 and the client computer 3 communicate with each other as follows.

  As shown in FIG. 3, first, the client unit 34 of the client computer 3 transmits an FTP connection request to the server unit 214 of the programmable display 2. When the server unit 214 receives the FTP connection request, the server unit 214 transmits an FTP connection response indicating that the connection is “OK” to the client unit 34 if the client computer 3 is a device that is permitted to connect.

  Upon receiving this FTP connection response, the client unit 34 transmits an image data acquisition request to the server unit 214. Upon receiving this image data acquisition request, the server unit 214 transmits the image data developed in the work memory 28 to the client unit 34 together with the device setting data.

  When the client computer 3 acquires the image data from the programmable display device 2, the client computer 3 activates the display processing unit 31 and performs display processing based on the image data. At this time, the client computer 3 sets the device ID in the work memory 36 based on the device ID of the device setting data.

  When the device ID is set, the client unit 34 performs RPC connection with the server unit 214. When the RPC connection is established with the server unit 214, the client unit 34 requests transmission of PLC 5 data designated based on the set device ID, and is transmitted from the server unit 214 in response to the request. Receive data.

[4. Operation of client computer in both modes]
Next, the operation of the client computer 3 in the synchronous mode and the asynchronous mode will be described with reference to the flowchart of FIG.

  First, in the synchronous mode (YES in step S11), the device ID acquired from the programmable display 2 is stored in the cache memory 36 of the client computer 3 by the client unit 34 (step S12). Next, the device ID stored in the cache memory 36 is copied to the device designation address in the work memory 35 by the ID changing unit 32 (step S13).

  Then, the device ID is read from the device designation address by the ID change determination unit 33 (step S14). This device ID is given to the display processing unit 31 as a changed access ticket. Then, a series of display processing is performed by the display processing unit 31 based on the device ID (step S15).

  In step S11, when the mode is asynchronous (NO), the process proceeds to step S14. In this case, since the device ID is not copied from the cache memory 36 to the work memory 35, display processing is performed based on the device ID set in the client computer 3 in step S15.

  The display process in step S15 executed in the client computer 3 will be described in detail later.

[5. Operation of programmable display and client computer in both modes]
Here, an operation for display performed in the programmable display 2 and the client computer 3 in the synchronous mode and the asynchronous mode will be described with reference to FIG.

[5-1. Device ID setting]
First, in the programmable display device 2, as described above, the ID changing unit 212 receives a device ID change request from the display communication processing unit 211, and sets a new value of the device ID to the device designation address of the work memory 28. input. Also, the ID change determination unit 213 returns a change notification and an access ticket to the display communication processing unit 211 in response to an inquiry about a change in the device ID from the display communication processing unit 211. The display communication processing unit 211 acquires data by switching communication to the PLC 5 specified by the access ticket (device ID after change), and switches and displays the data on the currently displayed image.

  On the other hand, in the client computer 3, first, the client unit 34 receives an instruction from the display processing unit 31 and requests the programmable display device 2 to transmit image data and device setting data. When the server unit 214 of the programmable display device 2 returns image data and device setting data to the client unit 34 in response to this request, the display processing unit 31 performs image display processing based on the image data and device setting data. I do. At this time, the display processing unit 31 instructs the ID changing unit 32 to write the acquired initial ID in the work memory 35.

[5-2. (Synchronous mode)
In the synchronous mode, the client unit 34 inquires of the server unit 214 about a change in the device ID in response to a request from the display processing unit 31. As a result of inquiring the ID changing unit 213 about whether or not the ID device has changed, the server unit 214 notifies the client unit 34 of the fact that the device ID has not changed. At this time, the client unit 34 does not update the device ID in the cache memory 36 because the device ID has not changed, so the device ID in the work memory 35 is not updated.

  In this case, the display processing unit 31 receives an access ticket for the device ID that has not been changed and the device ID that has not been changed through the ID change determination unit 33. As a result, the display processing unit 31 requests the server unit 214 for data of the PLC 5 specified based on the device ID. When the server unit 214 returns the data designated in response to this request, the display processing unit 31 displays the data on the image.

  Further, when the device ID has changed as a result of inquiring the ID changing unit 213 about whether or not the ID device has changed, the server unit 214 notifies the client unit 34 of the change. At this time, when the client unit 34 updates the device ID in the cache memory 36 due to a change in the device ID, the device ID in the work memory 35 is also updated.

  In this case, the display processing unit 31 receives a change notification that the device ID has changed through the ID change determination unit 33 and an access ticket for the changed device ID. Thereby, the display processing unit 31 requests the server unit 214 for data of the PLC 5 designated based on the changed device ID. When the server unit 214 returns the data designated in response to this request, the display processing unit 31 switches and displays only the data on the same image.

  Thus, in the synchronous mode, the same data as the data displayed on the programmable display 2 is displayed on the same image as the image displayed on the programmable display 2 on the client computer 3. For example, when the programmable display 2 is displaying data acquired from the PLC 5 ([PLC1]), the client computer 3 also displays the data acquired from [PLC1].

[5-3. (Asynchronous mode)
In the asynchronous mode, the display processing unit 31 gives a change request to the ID changing unit 32 when an instruction to change the device ID is given by a user operation of the client computer 3. Upon receiving this change request, the ID changing unit 32 writes the changed device ID value to the device designation address in the work memory 35.

  The display switching unit 31a of the display processing unit 31 inquires of the ID change determination unit 33 about whether or not the value of the device ID has changed at the end of the display scan. Upon receiving a change notification from the ID change determination unit 33 as a result of the inquiry, the display switching unit 31a issues a switching request according to the changed device ID to the display processing unit 31 and the client unit 34, and the changed device ID is issued to the client. To part 34. The client unit 34 transmits the switching request and the changed device ID to the server unit 214. Then, the programmable display device 2 uses the display communication processing unit 211 to switch the PLC 5 based on the device ID to perform communication to acquire data, and returns the data to the client unit 34 through the server unit 214.

  When the display processing unit 31 receives the data through the client unit 34, the display processing unit 31 updates the display of the image in the next display scan based on the data.

  Thus, in the asynchronous mode, data different from the data displayed on the programmable display 2 is displayed on the same image as the image displayed on the programmable display 2 on the client computer 3. For example, when the programmable display 2 displays data acquired from the PLC 5 ([PLC 1]), the client computer 3 displays data acquired from a different PLC 5 ([PLC 2]).

  Here, PLC5 ([PLC1]) and PLC5 ([PLC2]) are connected to different communication ports (for example, COM port 1 and COM port 2 (not shown)) of the programmable display 2, so that programmable display can be performed simultaneously. Communication with the device 2 becomes possible.

[6. Image display operation of programmable display and client computer)
A specific example of the operation of displaying data in the programmable display 2 and the client computer 3 that communicate with each other as described above will be described.

  Here, as shown in FIGS. 6A to 6C, a temperature controller of the same model is used as the device 6 connected to each PLC 5, and the temperature data is displayed on the temperature monitor image 101 for temperature monitoring. An example will be described.

  The temperature monitor image 101 includes a common image 102 and a data display image 103. The common image 102 is a base image used without switching to the data of the device 6 acquired from each PLC 5 in common. The data display image 103 is a component image that displays data acquired from the PLC 5, and switches according to the data to be displayed. The data display image 103 includes a selector list 103a and a data display unit 103b. The selector list 103a is a component image that displays a list of temperature (data) types in a pull-down manner when the user performs a touch operation. The data display unit 103b is a component image that displays data acquired from the PLC 5 that is currently communicating.

  As shown in FIG. 6A, in the programmable display device 2, the furnace temperature is displayed in the data display image 103. The furnace temperature is furnace temperature data obtained from the PLC 5 (for example, the device address D0000 of [PLC1] described above) specified by the equipment ID.

  In the synchronous mode, the data acquired from the programmable display 2 is displayed on the client computer 3 based on the same device ID as the device ID set on the programmable display 2. Accordingly, the same data is displayed on the temperature monitor image 101 shown in FIG.

  On the other hand, in the asynchronous mode, when the selector list 103a is touched by the user from this state in the client computer 3, the types of temperatures that can be selected by the selector list 103a are expanded and displayed as shown in FIG. 6B. To do. In the example shown in FIG. 6B, the cooling water temperature, the hydraulic pressure temperature, and the ambient temperature can be selected. These temperatures are acquired from different PLCs 5.

  Further, from this state, as shown in FIG. 6C, the hydraulic temperature is selected from the selector list 103a by a touch operation by the user. Then, the device ID at the device designation address in the work memory 35 is rewritten by the ID changing unit 32 to the device ID (client side ID) of the PLC 5 (for example, [PLC2] described above) that holds the hydraulic temperature. In this state, the ID change determination unit 33 determines that the value of the device ID at the device specified address has changed. At this time, in the programmable display device 2, the device ID at the device designation address in the work memory 28 remains the device ID (display device side ID) of the PLC 5 ([PLC1]) that holds the furnace temperature.

  In the next display scan, the display communication processing unit 211 communicates with the PLC 5 specified by the changed device ID value. At this time, data of a desired hydraulic temperature is acquired from a data acquisition address (for example, device address D0001) in the memory 51 of the PLC 5. As a result, the data is displayed on the data display unit 103b on the client computer 3. In this state, the client computer 3 displays data different from the data displayed on the programmable display 2 in the temperature monitor image 101 as shown in FIG.

[Summary of Embodiment]
As described above, the control system 1 according to the present embodiment displays the same image on the programmable display 2 and the client computer 3 that can communicate with each other. In the programmable display 2, the data acquired from PLC5 (for example, [PLC1]) specified by apparatus ID memorize | stored in the working memory 28 is displayed on an image. On the other hand, in the client computer 3, data acquired from the PLC 5 (for example, [PLC 2]) specified by the device ID stored in the work memory 35 (a value different from the device ID in the work memory 28) is read from the programmable display 2. Obtained and displayed on the image. Thus, the reason why the data of different PLCs 5 can be switched and displayed on the same image is because the PLC 5 serving as the communication partner is indirectly designated through the value of the device ID at the device designation address. The reason why such display is possible is that the programmable display 2 and the client computer 3 are provided with an area for storing the device ID in the work memory 28 and the work memory 35 independently. . Therefore, it is only necessary to prepare one common image for displaying the data of different PLCs 5, and the man-hour for creating the image can be greatly reduced, and the storage capacity of the image data in the user memory 27 Can be reduced.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  The data display system of the present invention individually displays data acquired from different PLCs on both images while displaying the same image on a programmable display and a client computer that are communicably connected to each other. Therefore, the data display system of the present invention can be suitably used for a data display system that displays a plurality of PLC data.

1 Control system (data display system)
2 Programmable display 3 Client computer 5 PLC (connected equipment)
21 HMI processing unit 26 Data memory 27 User memory 28 Working memory (internal memory on display unit)
31 Display processing unit (client side display processing means)
31a Display switching unit 32 ID changing unit 33 ID change determining unit 34 Client unit (client means)
35 Working memory (internal memory on the client side)
51 Memory 101 Temperature monitor image (image)
102 common image 103 data display image 103b data display unit 211 display communication processing unit (display side display processing means)
211a Display switching unit 211b Communication switching unit 212 ID changing unit 213 ID change determining unit 214 Server unit (server means)

Claims (6)

A plurality of connected devices connected to the programmable display so as to communicate with each other and obtain the same image as the image displayed on the programmable display from the programmable display. In the client computer configured to display the data acquired from any of the above in the image,
The programmable display displays the data acquired by communicating with one of the connected devices specified by a display-side ID stored in a display-side internal memory provided in the programmable display on the image. A client-side internal memory for storing a client-side ID set in the client computer to specify another one of the connected devices at a predetermined address;
Client means for requesting and acquiring the data obtained by the programmable display in communication with the connected device specified by the client side ID from the programmable display,
A client computer comprising: client-side display processing means for displaying the data acquired by the client means on the image.   A client program for causing a computer to function as the client-side display processing means and the client means in the client computer according to claim 1. A programmable display that displays data acquired from any of a plurality of connected devices on an image, and is connected to a client computer that acquires and displays the same image as the image from the programmable display so as to communicate with each other In a programmable display,
A display-side internal memory that stores a display-side ID set in a programmable display to identify one of the connected devices at a predetermined address;
Display-side display processing means for displaying the data acquired by communicating with the connected device specified by the display-side ID on the image;
A client-side internal memory that stores a client-side ID set in a client computer to specify another one of the connected devices at a predetermined address, and a programmable display that is specified by the client-side ID Server means for transmitting the data to the client computer in response to a request from the client computer comprising client-side display processing means for displaying the data acquired by communicating with a connected device on the image. A programmable display device characterized by comprising:   A server program for causing a computer to function as the display-side display processing means and the server means in the programmable display according to claim 3. A programmable display and a client computer connected to be communicable with each other, wherein the client computer acquires and displays the same image as the image displayed on the programmable display from the programmable display, and the programmable In a data display system configured to display data acquired from any of a plurality of connected devices connected to a display on the image,
The programmable display is
A display-side internal memory that stores a display-side ID set in the programmable display to identify one of the connected devices at a predetermined address;
Display-side display processing means for displaying the data acquired by communicating with the connected device specified by the display-side ID on the image;
The client computer is
A client-side internal memory that stores a client-side ID set in the client computer to specify another one of the connected devices at a predetermined address;
Client means for requesting and acquiring the data obtained by the programmable display in communication with the connected device specified by the client side ID from the programmable display,
Client-side display processing means for displaying the data acquired by the client means on the image,
The programmable display is
A data display system comprising server means for transmitting the data to the client computer in response to a request from the client means of the client computer.   6. A data display program for causing a computer to function as the display-side display processing means, the client-side display processing means, the client means, and the server means in the data display system according to claim 5.

Images