JP2011039643A - Programmable controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a programmable controller which can obtain a necessary file from the outside and sending the file to the outside without significantly changing a control program. <P>SOLUTION: The programmable controller includes a CPU unit and one or more extension units connected to the CPU unit to function as an FTP. The input of setting data to make the programmable controller function as the FTP client is accepted, and the setting data whose input has been accepted are stored. Function assignment information including flag information related with whether to assign a prescribed function to the FTP client is stored, and the flag information is written for each prescribed function, and when the writing of the flag information is detected, file transfer is executed based on the stored setting data. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a programmable controller functioning as an FTP client that executes a desired file transfer according to a file transfer protocol (hereinafter referred to as FTP).

  2. Description of the Related Art Conventionally, work such as updating a control program for controlling the operation of a programmable controller or updating a setting file often occurs at a manufacturing site when changing the manufacturing setup. In such a case, for example, the setup is dynamically changed by downloading parameters using a so-called recipe function such as a programmable display connected to the programmable controller or a data collection device.

  Further, as disclosed in Patent Document 1, necessary files, parameters, and the like can be acquired from an external computer or the like having an FTP client function by using the FTP server function of the programmable controller. In Patent Document 1, when an external computer having an FTP client function transmits a file read command or write command to a programmable controller functioning as an FTP server, and the programmable controller receives the write command, the desired file is FTP It is written to a programmable controller that functions as a server.

JP 2006-106999 A

  However, when the programmable controller functions as an FTP server as in the above-mentioned Patent Document 1, the trigger for reading or writing the file is only on the FTP client side, and the execution status of the control program in the programmable controller is considered. Therefore, it is necessary to execute a separate process separately. In addition, it is necessary to make necessary settings in an external computer, such as preparing an external computer having a rewriting function, or it is necessary to create a necessary program in an external computer. Updating the program has a problem that the process is complicated.

  On the other hand, it is conceivable to solve the above problems by using a programmable controller as an FTP client. However, in order to make the programmable controller an FTP client, it is usual to update the settings in the programmable controller as necessary, and to create a control program such as a ladder program that newly defines dedicated instructions, special instructions, etc. related to file transfer. Need to create. That is, in the control program, it is necessary to program-code control related to file transfer in addition to conventional operation control, and the complexity of processing cannot be reduced.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a programmable controller capable of acquiring a necessary file from outside and sending it to the outside without greatly changing the control program. .

  In order to achieve the above object, a programmable controller according to the first invention comprises a CPU unit and one or a plurality of expansion units connected to the CPU unit, and functions as an FTP client during file transfer. A setting data receiving unit that receives input of setting data to function as an FTP client, a setting data storage unit that stores setting data that has been input, an FTP client function providing unit that functions as an FTP client during file transfer, and an FTP client A function allocation information storage unit that stores function allocation information including flag information regarding whether or not to allocate a predetermined function; and a flag information update unit that updates the flag information, the flag information update unit including the function allocation information Affection When the flag information is written for each predetermined function of the storage unit and the FTP client function providing unit detects the writing of the flag information, the FTP client function providing unit stores the setting data stored in the setting data storage unit File transfer is executed based on the above.

  Here, the function allocation information storage unit is a predetermined memory area in the CPU unit, and may be configured as an area allocated as a virtual device that can be recognized on a control program such as a ladder program. .

  The programmable controller according to a second aspect of the present invention is characterized in that, in the first aspect, the setting data includes information related to an acquisition destination of data to be transferred.

  The programmable controller according to a third aspect is characterized in that, in the first or second aspect, the setting data includes information for specifying a file transfer operation.

  The programmable controller according to a fourth aspect of the present invention is the programmable controller according to any one of the first to third aspects, wherein the FTP client function providing unit includes a transfer status output unit that outputs information indicating a file transfer status. Features.

  The programmable controller according to a fifth aspect of the present invention is the programmable controller according to the fourth aspect, wherein the FTP client function providing unit is the function allocation information storage unit of the CPU unit or a detachable type as an upload source or download destination of a file to be transferred. A storage destination selection receiving unit for receiving selection of a memory card is provided.

  The programmable controller according to a sixth aspect of the present invention is the programmable controller according to any one of the first to fifth aspects, wherein the FTP client function providing unit includes a transfer direction selection receiving unit that receives selection of file upload or download. Features.

  Moreover, the programmable controller which concerns on 7th invention is provided with the conversion part which converts into the CSV format at the time of upload, when the information memorize | stored in the said function allocation information storage part is upload object in 6th invention, It is characterized by the above-mentioned. To do.

  The programmable controller according to an eighth invention is the programmable controller according to any one of the first to seventh inventions, wherein the function allocation information storage unit sends flag information to be updated by the flag information update unit to the CPU unit, Information is stored in each of the expansion units.

  In the first invention, an input of setting data for functioning as an FTP client is accepted, and the setting data that has been accepted is stored. An FTP client function providing unit that functions as an FTP client at the time of file transfer constantly monitors a function assignment information storage unit that stores flag information related to whether or not to assign a predetermined function to the FTP client. When writing of flag information for each function is detected, file transfer is executed based on the stored setting data. Thereby, it is not necessary to create a file transfer program separately, and write processing of flag information is executed. For example, virtual devices allocated to the memory area in the CPU unit are respectively transferred to FTP client file transfer requests and files. Define a relay device (bit device) indicating a transfer interruption request, file transfer completion response, file transfer error response, etc., as a data device (word device) indicating transfer results, transfer status, transfer progress, etc., ladder program, etc. In this control program, the programmable controller can function as an FTP client based on setting data set independently of the control program simply by updating the flag information of a predetermined relay device to the ON state. It is possible to ensure the versatility of operation control in Ma logic controllers. In addition, the file transfer can be executed by the programmable controller as a trigger, and the desired file transfer can be executed when file update, parameter update, etc. are required by the programmable controller installed in the field. It becomes.

  In the second invention, since the setting data includes information on the acquisition destination of the data to be transferred, there is no need to create a separate file transfer program as a program for controlling the operation of the programmable controller. It is possible to change the setting data necessary for the operation at any time. In addition, since it is independent of the program that controls the operation of the programmable controller, it is possible to dynamically execute file transfer without stopping the programmable controller. Further, information to be downloaded (for example, a device value) can be downloaded to the function assignment information storage unit, and a desired function can be assigned to the CPU unit. For example, by writing a new device value to a device defined in the memory of the CPU unit, the processing content executed by a control program such as a ladder program can be changed.

  In the third invention, since the setting data includes information specifying the file transfer operation, it is not necessary to separately create a file transfer program as a program for controlling the operation of the programmable controller, and the flag information on / off state is set. File transfer can be executed only with the setting of.

  In the fourth invention, since the FTP client function providing unit can acquire information indicating the file transfer status, it is possible to easily check the operation status of the FTP client function.

  In the fifth invention, the FTP client function providing unit can accept the selection of the function allocation information storage unit of the CPU unit or the removable memory card as the upload source or download destination of the file to be transferred. The function allocation information can be uploaded from a portable memory card or downloaded to a portable memory card.

  In the sixth aspect of the invention, the FTP client function providing unit can switch the file transfer direction by accepting a file upload or download selection, and by downloading the function allocation information to be downloaded to the function allocation information storage unit A desired function can be assigned to the CPU unit.

  In the seventh invention, when information (for example, a device value) stored in the function allocation information storage unit is an upload target, what information is stored by converting the data format to the CSV format at the time of upload. Can be confirmed as tabular data.

  In the eighth invention, flag information (relay device value) updated by the flag information update unit can be stored in the CPU unit, and other information (data device value) can be stored in the expansion unit. Thus, flag information relating to requests such as file transfer and interruption can be stored in the CPU unit, and function assignment information acquired by the file transfer process can be stored in the necessary extension unit.

  According to the above configuration, it is not necessary to create a separate file transfer program, and the programmable controller can function as an FTP client by executing only the flag information writing process. Sexuality can be secured. In addition, the file transfer can be executed by the programmable controller as a trigger, and the desired file transfer can be executed when file update, parameter update, etc. are required by the programmable controller installed in the field. It becomes.

It is a schematic diagram which shows the structure of the programmable controller which concerns on embodiment of this invention. It is a block diagram which shows the structure at the time of comprising the arithmetic display apparatus connected with the programmable controller which concerns on embodiment of this invention using control parts, such as CPU. It is a functional block diagram which shows the function of the programmable controller program which concerns on embodiment of this invention. It is an illustration figure of the connecting point FTP server setting screen of the calculation display apparatus of the programmable controller which concerns on embodiment of this invention. It is an illustration figure of the FTP file transfer setting screen of the calculation display apparatus of the programmable controller which concerns on embodiment of this invention. It is a functional block diagram of the FTP client function provision part of the programmable controller which concerns on embodiment of this invention. It is an illustration figure of the file transfer progress display screen in the display of the CPU unit of the programmable controller which concerns on embodiment of this invention. It is an illustration figure of the data structure of the unit allocation table memorize | stored in the memory of CPU unit of the programmable controller which concerns on embodiment of this invention. It is an illustration figure of the data structure memorize | stored in the function allocation information storage part of the programmable controller which concerns on embodiment of this invention. It is a flowchart which shows the procedure of the file transfer process of CPU of the CPU unit of the programmable controller which concerns on embodiment of this invention. It is a flowchart which shows the process sequence in FIG.10 S1009 of CPU of the CPU unit of the programmable controller which concerns on embodiment of this invention.

  Hereinafter, a programmable controller according to an embodiment of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a schematic diagram showing a configuration of a programmable controller according to an embodiment of the present invention. As shown in FIG. 1, the programmable controller 1 includes a CPU unit 2 and a plurality of expansion units 3, 3,. .. Are connected to controlled devices 5, 5,... For controlling the operation for each function, and a sequential program such as a ladder program (hereinafter referred to as a control program). Accordingly, the operation of each controlled device 5 is controlled by a command from the CPU unit 2.

  The CPU unit 2 includes a CPU that sends commands to the connected expansion units 3, 3,... According to a control program stored in the built-in memory 21. Further, the expansion units 3, 3,... Control the operation of the connected controlled devices 5, 5,. In addition, the parameter information for controlling the operation of the controlled devices 5, 5,... Is stored in the memories 31, 31,.

  The calculation display device 4 is connected so as to be able to perform data communication with the CPU unit 2, and transmits the created control program to the CPU unit 2. FIG. 2 is a block diagram showing a configuration when the arithmetic display device 4 connected to the programmable controller 1 according to the embodiment of the present invention is configured using a control unit such as a CPU.

  As shown in FIG. 2, the calculation display device 4 according to the present embodiment includes at least a control unit (CPU) 41, a memory 42, a storage device 43 such as a hard disk, an I / O interface 44, a video interface 45, a communication interface 46, It consists of a portable disk drive 47 and an internal bus 48 for connecting the hardware described above.

  The control unit 41 is connected to each hardware unit as described above of the calculation display device 4 via the internal bus 48, and controls the operation of each hardware unit described above and is stored in the storage device 43. Various software functions are executed according to the program 100. The memory 42 is composed of a volatile memory such as SRAM or SDRAM, and a load module is expanded when the computer program 100 is executed, and stores temporary data generated when the computer program 100 is executed.

  The storage device 43 includes a built-in fixed storage device (hard disk), a ROM, and the like. The computer program 100 stored in the storage device 43 is downloaded by a portable disk drive 47 from a portable recording medium 90 such as a DVD or CD-ROM in which information such as programs and data is recorded. To the memory 42 and executed. Of course, a computer program downloaded from an external computer connected to the network via the communication interface 46 may be used.

  The I / O interface 44 is connected to input devices such as a keyboard 441 and a mouse 442 and receives data input. The video interface 45 is connected to a display device 451 such as a CRT monitor or LCD, and displays a predetermined image.

  The communication interface 46 is connected to an internal bus 48, and is connected to an external network such as the Internet, a LAN, or a WAN, so that data can be transmitted / received to / from an external computer or the like. In addition, data can be transmitted / received to / from the CPU unit 2 via a communication line.

  FIG. 3 is a functional block diagram showing functions of the programmable controller 1 according to the embodiment of the present invention. In FIG. 3, the CPU 20 of the CPU unit 2 functions as a setting data input receiving unit 301, an FTP client function providing unit 302, and a flag information updating unit 303. Each control unit (microprocessor) of the extension unit 3 that executes file transfer may function as the FTP client function providing unit 302. Even if the FTP client function providing unit 302 is realized by causing the CPU 20 to execute an FTP client program stored in advance in the CPU unit 2 or the like, an FTP client program installed from a CD-ROM, or the like, It may be realized by being executed by a microprocessor or the like.

  The memory 21 of the CPU unit 2 includes a function assignment information storage unit 211 and a setting data storage unit 212, and each is set in a physically or logically partitioned area. The function assignment information storage units 211 and 311 may be provided in the memory 21 of the CPU unit 2 or may be provided in the memory 31 in the expansion unit 3. For example, the function assignment information storage unit 211 is an area assigned to the memory 21 of the CPU unit 2 as a device that can be recognized on a control program such as the ladder program 8.

  The setting data input accepting unit 301 accepts input of setting data using an input device such as the keyboard 441 and the mouse 442 of the calculation display device 4, and associates with the transfer ID for identifying the file transfer in association with the memory 21 of the CPU unit 2. And stored in the setting data storage unit 212. The information included in the setting data to be stored includes at least information specifying the FTP server 6 to be connected, such as an FTP server address for identifying the FTP server 6, an FTP server root folder, a user name, and a password. Of course, information regarding the connection destination FTP server 6 may include information regarding timeout time, number of retries, retry interval, and the like.

  The setting data also includes information related to file transfer operations. For example, a file name to be transferred, a transfer operation (upload or download), a transfer destination folder, a transfer source file, and the like are set. Furthermore, information (device values such as bit data and word data) stored in the function assignment information storage unit 211 can also be a target for file transfer, and a desired function can be assigned to the CPU unit 2, Function assignment information can also be uploaded for use with other devices.

  Input of setting data is accepted from a setting screen displayed on the display device 451 of the calculation display device 4. FIG. 4 is a view showing an example of a connection destination FTP server setting screen of the calculation display device 4 of the programmable controller 1 according to the embodiment of the present invention.

  As shown in FIG. 4, the connection destination FTP server setting screen has an address setting area 401 for setting the IP address of the FTP server 6 for identifying the FTP server 6, and a root folder setting area for setting the root folder of the FTP server 6. 402, a user ID setting area 403 for setting a user ID for identifying a user, and a password setting area 404 for setting a password. Information regarding the timeout time, the number of retries, the retry interval, etc. is set in the detailed setting area 405.

  The file transfer operation is also accepted from the setting screen displayed on the display device 451 of the calculation display device 4. FIG. 5 is an exemplary view of an FTP file transfer setting screen of the calculation display device 4 of the programmable controller 1 according to the embodiment of the present invention. FIG. 5A is an exemplary view of an FTP server setting screen for setting a connection destination FTP server for each transfer ID for identifying file transfer processing, and FIG. 5B is an FTP file transfer setting screen for each transfer ID. It is an illustration figure.

  As shown in FIG. 5A, on the FTP server setting screen, a transfer ID for identifying a file transfer process is assigned to each connection destination FTP server. When the selection of the setting button 51 is received by operating the mouse 442, the FTP file transfer setting screen of FIG. 5B is displayed.

  As shown in FIG. 5B, on the FTP file transfer setting screen, whether the transfer target is a file for each transfer ID, a device assigned to the memory area in the CPU unit 2, or the transfer operation is uploaded ( PUT) or download (GET), and a transfer destination folder and transfer source file are set.

  The operation setting data of the file transfer that has received the setting is transmitted to the setting data input receiving unit 301 in the CPU unit 2 via the communication interface 46 of the calculation display device 4. By storing the file transfer operation setting data received by the input reception unit 301 in the setting data storage unit 212, it is not necessary to make detailed settings at the time of file transfer, and it is not necessary to create a file transfer program separately. .

  The CPU 20 of the CPU unit 2 executes a control program stored in the memory 21 based on an input signal input from an input device (not shown) connected to the CPU unit 2 via the expansion unit 3 or the like. The operation of the controlled device 5 (output device) connected via the expansion unit 3 or the like is controlled. That is, based on the input signal from the input device, the function assignment information (device value) assigned to the input device and stored in the function assignment information storage unit 211 is turned on / off (for example, the bit device value is '1' or '0'). Based on on / off of the control program and the function assignment information, the CPU 20 controls the operation by turning on / off the device value assigned to the output device.

  In the present embodiment, the FTP client operation is controlled as one of the assigned functions. That is, the programmable controller 1 is caused to function as an FTP client using the FTP client function providing unit 302. FIG. 6 is a functional block diagram of the FTP client function providing unit 302 of the programmable controller 1 according to the embodiment of the present invention.

  The flag information monitoring unit 321 of the FTP client function providing unit 302 monitors the function allocation information storage unit 211 in the memory 21 of the CPU unit 2 in a timely manner, and whether or not flag information (for example, bit device value) has been updated, that is, a flag It detects whether the information has been updated to the on state. When it is detected that the flag information has been updated to the on state, the file transfer execution unit 322 is activated.

  In the function assignment information storage unit 211, for each transfer ID, flag information indicating whether it is a transfer request, flag information indicating whether it is an interruption request, flag information indicating whether it is a completion response, Flag information indicating whether or not an error response is stored (for example, a device indicating various flag information is assigned for each transfer ID). For example, when the flag information monitoring unit 321 detects that the flag information indicating whether or not it is a transfer request has been updated to an on state, the file transfer execution unit 322 sets the corresponding transfer ID setting data as a setting data storage unit Read from 212 and execute file transfer. Since the setting data storage unit 212 stores setting data regarding whether the transfer operation is upload (PUT) or download (GET) for each transfer ID, the function assignment information is set according to the read setting data. Information stored in the storage unit 211 (for example, word device value), files stored in the memory card 7 and the like are uploaded or downloaded.

  The transfer status output unit 323 displays a data device (word device) indicating the transfer result, transfer status, transfer progress, etc. assigned to the function allocation information storage unit 211 as information on the progress of the file transfer process with the FTP server 6. To the display unit 9 or the arithmetic display unit 4 of the CPU unit 2. For example, a numeric code indicating a transfer result for each transfer ID, a numeric code indicating a transfer status such as being transferred for each transfer ID or waiting for a retry, and a numeric code indicating the progress of file transfer processing as a percentage for each transfer ID Etc.

  FIG. 7 is an exemplary view of a file transfer progress display screen on the display device 9 of the CPU unit 2 of the programmable controller 1 according to the embodiment of the present invention. As shown in FIG. 7, a transfer ID display area 701 that displays a transfer ID for each file transfer process, a status display area 702 that simply displays the status of the file transfer process, and a text display that displays the status of the file transfer process as text. An area 703 and a progress display area 704 for displaying the progress of the file transfer process with a bar corresponding to the percentage are provided.

  In the example of FIG. 7, for each transfer ID, an indicator indicating which flag information is on in the status display area 702 is displayed. The hatched button indicates flag information that is on, for example, transfer ID 'ID0' indicates a state immediately after the file transfer process is completed, transfer ID 'ID3' indicates that the file transfer process is completed, A state where all flag information is cleared to an off state is shown.

  On the other hand, the transfer ID “ID1” indicates that a file transfer process execution command has been issued but is waiting for a retry with the FTP server 6. The transfer ID “ID2” indicates that the file transfer process is being executed.

  Note that the status display area 702 may have an input function capable of directly setting flag information as well as indicator display. For example, the display device 9 may be configured by a touch display, and the corresponding flag information may be turned on / off by touching the displayed button with a finger. In this case, the programmable controller 1 can function as an FTP client without using a control program such as a ladder program.

  Returning to FIG. 6, the transfer direction selection accepting unit 324 reads the setting data stored in the setting data storage unit 212, so that the transfer operation for each transfer ID is upload (PUT) or download (GET). Accepts the selection of some.

  The storage destination selection receiving unit 325 receives selection of the function assignment information storage unit 211 of the CPU unit 2 or the detachable memory card 7 as an upload source or download destination of the transferred file. When selection is accepted as the upload source or download destination of the file to be transferred by the removable memory card 7, not only the file stored in the programmable controller 1 in advance but also the file from the outside can be uploaded It becomes easy to take out downloaded ones to the outside.

  FIG. 8 is an exemplary diagram of a data configuration of a unit allocation table stored in the memory 21 of the CPU unit 2 of the programmable controller 1 according to the embodiment of the present invention. As shown in FIG. 8, in the unit allocation table, the head address information of the memory area allocated to each of the CPU unit 2 and the expansion units 3, 3,... Connected to the CPU unit 2 is stored in association with each other. In the example of FIG. 8, the head address of the CPU unit 2 is “R30000”, whereas the extension address of the extension unit A is “R30200”, which is the starting point of the offset address of the function assignment information described later. The memory area allocated to each expansion unit 3 is appropriately configured by a relay device (bit device) and a data device (word device).

  FIG. 9 is an exemplary diagram of a data configuration stored in the function assignment information storage unit 211 of the programmable controller 1 according to the embodiment of the present invention. The function allocation information storage unit 211 is provided in the memory 21 of the CPU unit 2, but may be provided in the memory 31 of the expansion unit 3. FIG. 9A shows an example of a bit information allocation table for identifying whether the bit information is in the on state or the off state, and FIG. 9B is a word information allocation for identifying the state by a numeric code or the like. The example figure of a table is shown, respectively.

  As shown in FIG. 9A, in the bit information allocation table, an offset address from the head address is stored in association with each function. Here, when the offset address is “+0”, it means that the head address is in each expansion unit 3.

  For example, for a transfer request, an offset address is assigned to a transfer request IDn (n is a natural number from 0 to 9) for each transfer ID. The flag information monitoring unit 321 constantly monitors the function assignment information storage unit 211 in the memory 21 of the CPU unit 2 and, for example, detects that “1” has been written in the transfer request IDn, the bit based on the offset address By querying the information allocation table, it is possible to identify which transfer ID is the transfer request.

  As shown in FIG. 9B, similarly in the word information allocation table, an offset address from the head address is stored in association with each function. Here, when the offset address is “+0”, it means that the head address is in each expansion unit 3.

  For example, for transfer completion, an offset address is assigned to transfer completion IDn (n is a natural number from 0 to 9) for each transfer ID. The flag information monitoring unit 321 constantly monitors the function assignment information storage unit 211 in the memory 21 of the CPU unit 2 and, for example, detects that “1” has been written in the transfer completion IDn, the word based on the offset address By querying the information allocation table, it is possible to identify the transfer ID for which transfer is complete.

  Returning to FIG. 3, the flag information update unit 303 is the flag information stored in the function assignment information storage unit 211, and among the flag information monitored by the FTP client function providing unit 302, a desired information The flag information corresponding to the function is updated to the on state. For example, by writing “1” in the transfer request flag for each transfer ID, the FTP client function providing unit 302 starts file transfer.

  Thus, in the CPU unit 2, it is not necessary to create a file transfer program separately, and the flag information stored in the function assignment information storage unit 211 is updated, that is, only the flag information is updated to the ON state. The file transfer stored in association with the desired transfer ID can be easily executed. Further, since the trigger for executing the file transfer is not the FTP server 6, it is possible to execute the file transfer for the necessary file at a desired time.

  FIG. 10 is a flowchart showing a file transfer process procedure of the CPU 20 of the CPU unit 2 of the programmable controller 1 according to the embodiment of the present invention. In FIG. 10, flag information indicating each function is simply expressed as a flag, and each function is expressed as a “function” flag. Further, the flag information indicates an on state when it is “1” and an off state when it is “0”.

  The CPU 20 of the CPU unit 2 updates the device flag indicating the file transfer request to “1” for the transfer ID corresponding to the desired file transfer based on a control program such as a ladder program (step S1001). When the device flag indicating the file transfer request is updated to “1” (flag information is in an on state), the CPU 20 (FTP client function providing unit 302) sends the corresponding transfer ID setting data from the setting data storage unit 212. Reading (step S1002), it is determined whether or not the file transfer process set in association with the transfer ID is an upload process (step S1003). When the CPU 20 (FTP client function providing unit 302) determines that it is an upload process (step S1003: YES), the CPU 20 (FTP client function providing unit 302) transfers the memory 21 (function allocation information) of the CPU unit 2 as the transfer source. It is determined whether or not the storage unit 211) (step S1004). When the CPU 20 (FTP client function providing unit 302) determines that the transfer source is not the memory 21 of the CPU unit 2 (step S1004: NO), the CPU 20 (FTP client function providing unit 302) transfers the memory card 7 to the transfer source. (Step S1005), and the process proceeds to step S1009.

  When the CPU 20 (FTP client function providing unit 302) determines that it is not an upload process (step S1003: NO), the CPU 20 (FTP client function providing unit 302) determines that it is a download process, and the transfer destination is a CPU unit. It is determined whether or not the second memory 21 (function allocation information storage unit 211) (step S1006). When the CPU 20 (FTP client function providing unit 302) determines that the transfer destination is not the memory 21 of the CPU unit 2 (step S1006: NO), the CPU 20 (FTP client function providing unit 302) transfers the memory card 7 to the transfer destination. (Step S1007), and the process proceeds to step S1009.

  The CPU 20 (FTP client function providing unit 302) determines that the transfer source is the memory 21 of the CPU unit 2 (step S1004: YES), or determines that the transfer destination is the memory 21 of the CPU unit 2 ( In step S1006: YES), the CPU 20 sets the memory 21 as a transfer source or transfer destination (step S1008), and executes a file transfer process (step S1009).

  FIG. 11 is a flowchart showing a processing procedure in step S1009 of FIG. 10 of the CPU 20 of the CPU unit 2 of the programmable controller 1 according to the embodiment of the present invention. The CPU 20 (FTP client function providing unit 302) starts a file transfer process (step S1101), and determines whether or not it has been updated to a device flag indicating a file transfer interruption request (step S1102). When the CPU 20 (FTP client function providing unit 302) determines that the device flag indicating the file transfer interruption request has been updated (step S1102: YES), that is, the device flag indicating the file transfer interruption request by the CPU 20 is' 1. When updated to ', the CPU 20 (FTP client function providing unit 302) interrupts the file transfer process and advances the process to step S1013. When the CPU 20 (FTP client function providing unit 302) determines that the device flag indicating the file transfer interruption request has not been updated (step S1102: NO), the CPU 20 (FTP client function providing unit 302) performs file transfer. The processing is continued to obtain information on the transfer result (step 1010).

  The CPU 20 (FTP client function providing unit 302), after starting the file transfer process, acquires the total data size of the transfer file from the transfer source, and sequentially manages the transferred data size of the transfer file. Then, the data transfer progress status (for example, 50% completion) at a predetermined timing is written to the device indicating the transfer progress. The display device 9 displays the progress of the file transfer process in the progress display area 704 with a bar or the like corresponding to the percentage based on the information written to the device indicating the transfer progress.

  Further, the CPU 20 (FTP client function providing unit 302) may output the status of the file transfer process (for example, transferring, waiting for retry interval, stopping) to the data device (word device) indicating the transfer status at any time. . The display device 9 displays the status of the file transfer process in the status display area 702 and the text display area 703 based on the information written to the device indicating the transfer status.

  The CPU 20 (FTP client function providing unit 302) determines whether or not the file transfer has ended normally (step S1011). When the CPU 20 (FTP client function providing unit 302) determines that the file transfer has been completed normally (step S1011: YES), the CPU 20 (FTP client function providing unit 302) displays a device flag indicating a file transfer completion response. Update to '1' (step S1012). When the CPU 20 (FTP client function providing unit 302) determines that the file transfer has ended abnormally (step S1011: NO), the CPU 20 (FTP client function providing unit 302) displays a device completion response flag indicating a file transfer completion response. Is updated to “1”, and the error response flag of the device indicating the file transfer error response is updated to “1” (step S1013). At the end of the file transfer process, the data device (word device) indicating the transfer result stores information indicating whether the transfer result is normal or abnormal (may include information such as timeout, write failure, etc.) You may do it.

  When the completion response flag or the error response flag is updated to “1”, the CPU 20 (FTP client function providing unit 302) determines that the file transfer process has ended, and sets the device flag indicating the file transfer request to “0”. (Step S1014). When the transfer request flag is updated to “0”, the CPU 20 (FTP client function providing unit 302) updates the updated completion response flag and error response flag to “0” (step S1015), and ends the processing. To do. Of course, it may be determined whether or not the file transfer process is completed based on whether or not “1” is stored in the transfer completion flag that is flag information indicating whether or not the transfer is completed.

  Note that the microprocessor of the expansion unit 3 may function as the FTP client function providing unit 302 instead of the CPU 20 of the CPU unit 2 as described above. In this case, the processing of the step in which the FTP client function providing unit 302 of FIG. 10 described above is the execution subject is executed not by the CPU 20 of the CPU unit 2 but by the microprocessor of the expansion unit 3.

  As described above, according to the present embodiment, there is no need to create a separate file transfer program, and the programmable controller 1 can function as an FTP client simply by executing the flag information on-state or off-state write processing. Can do. Therefore, the versatility of the operation control in the programmable controller 1 can be ensured. In addition, the file transfer can be executed by the programmable controller 1 side as a trigger, and a desired file transfer is executed when the file update, parameter update, etc. are required in the programmable controller 1 installed in the field. Is possible.

  Note that the function assignment information (device value) stored in the function assignment information storage unit 211 determines whether it is a device or a file based on the setting data in the FTP client function providing unit 302 at the time of uploading, and sets the data format. It is preferable to convert to CSV format. This is because the contents of the uploaded device can be easily confirmed as tabular data. In this case, the file data from the memory card 7 is sent as it is.

  On the other hand, when a CSV file is downloaded by designating a device as a transfer target, the FTP client function providing unit 302 interprets the CSV file, and adds the device number, data size, and data type added to the file. (Whether it is 1-bit bit data, 16-bit or 32-bit fixed-length data, or a character string) and the like, and the corresponding device based on the data size, data type, etc. By writing data to the number, the value of the corresponding device can be updated. If the file interpretation fails, it is assumed that the file transfer has failed, and the cause of the file interpretation failure (such as invalid format or device number out of the allocation range) is output to the device indicating the transfer result. The user can also specify the cause of the inconsistency of the file contents in a data format that can be edited. Also, by adopting the CSV format, which is a simple data format, the processing load on the FTP client function providing unit 302 is reduced while realizing data transfer in a data format that can be edited by the user.

  Further, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications and replacements are possible within the scope of the gist of the present invention. For example, the function allocation information storage unit 211 is not limited to being provided in the memory 21 of the CPU unit 2, but is provided in the expansion unit 3 such as a communication unit that transmits / receives data to / from the FTP server 6 together with the FTP client function providing unit 302. You may prepare.

  In this case, all of the function allocation information storage unit 211 may be provided in the expansion unit 3, or some information is left in the function allocation information storage unit 211 in the memory 21 of the CPU unit 2 and other information is expanded. The function allocation information storage unit 311 may be divided and stored in the memory 31 of the unit 3. For example, for items whose flag information is updated to an on state or an off state by a control program in the CPU unit 2, other numerical data is written in the function assignment information storage unit 211 in the memory 21 of the CPU unit 2. The flag information may be divided and stored in the function assignment information storage unit 311 in the memory 31 of the expansion unit 3.

1 programmable controller 2 CPU unit 3 extension unit 4 operation and display device 5 the controlled device 6 FTP server 7 the memory card 20 CPU
21 and 31 the memory 211 and 311 function allocation information storage unit 212 setting data storage unit 213 file information storage unit

Claims (8)

In a programmable controller composed of a CPU unit and one or a plurality of expansion units connected to the CPU unit and functioning as an FTP client during file transfer,
A setting data receiving unit that receives input of setting data to function as an FTP client;
A setting data storage unit that stores setting data that has been accepted;
An FTP client function providing unit that functions as an FTP client during file transfer;
A function assignment information storage unit for storing function assignment information including flag information regarding whether or not to assign a predetermined function to an FTP client;
A flag information update unit for updating the flag information,
The flag information update unit writes flag information for each predetermined function of the function allocation information storage unit,
When the FTP client function providing unit detects the writing of the flag information, the FTP client function providing unit executes file transfer based on the setting data stored in the setting data storage unit. Programmable controller characterized by   The programmable controller according to claim 1, wherein the setting data includes information related to an acquisition destination of data to be transferred.   The programmable controller according to claim 1, wherein the setting data includes information for specifying a file transfer operation.   4. The programmable controller according to claim 1, wherein the FTP client function providing unit includes a transfer status output unit that outputs information indicating a file transfer status. 5.   The FTP client function providing unit includes a storage destination selection receiving unit that receives selection of the function allocation information storage unit or a removable memory card of the CPU unit as an upload source or a download destination of a file to be transferred. The programmable controller according to claim 4.   The programmable controller according to claim 1, wherein the FTP client function providing unit includes a transfer direction selection receiving unit that receives selection of file upload or download.   The programmable controller according to claim 6, further comprising a conversion unit that converts the information stored in the function assignment information storage unit into a CSV format at the time of upload when the information is an upload target.   8. The function allocation information storage unit stores flag information to be updated by the flag information update unit in the CPU unit and other information in the extension unit, respectively. The programmable controller as described in any one of.

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