JP2015162179A - Sequence program replacement method of programmable controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a sequence program stored in a programmable controller from being erroneously replaced.SOLUTION: When a new sequence program is edited and created by a sequence program editing device 1, identification information V1, V2, V3, ... of sequence programs which can be replaced with the sequence program, are stored together with the sequence program. Identification information added to a sequence program is detected from a programmable controller 2 and if the detected identification information is included in the identification information stored together with the new sequence program, the sequence program of the programmable controller is replaced with this new sequence program. The sequence programs are replaced while confirming the correspondence therebetween before and after the replacement, such that the sequence program can be prevented from being erroneously replaced.

Description

  The present invention relates to a method for replacing a sequence program stored in a programmable controller with a sequence program edited and created by a sequence program editing apparatus.

  Various systems with multiple programmable controllers that sequence control various devices have been developed, and the sequence program executed by this programmable controller is edited and created by a single sequence program editing device, and the edited and created sequence In general, a program is stored in each programmable controller. Some sequence programs executed by each programmable controller are the same, but are generally different. Therefore, it is necessary to store the sequence program created and edited by the sequence program editing apparatus in the corresponding programmable controller without error. In particular, every time the sequence program is upgraded, it must be stored in the programmable controller without error, and the management of the combination of the programmable controller and the sequence program becomes more difficult as the system becomes larger and the number of programmable controllers increases. ing.

  In Patent Document 1, in a system in which a plurality of programmable controllers are connected to a development support tool such as a personal computer for editing and creating program data used by the program controller, a holder corresponding to each programmable controller is provided in the development support tool. An ID code that identifies the program data corresponding to the programmable controller, a holder number, and an identification code consisting of the transfer history information of the number of transfers and the transfer date and time are stored in each holder and each programmable controller, When storing program data together with the identification code and sending program data from the development support tool to the programmable controller, at least the ID number stored in the holder matches the ID number stored in the programmable controller , That is, program data and a programmable controller to store the holder so as to be transferred when the corresponding, so as to manage the combination of the programmable controller and program data, a data management method for a programmable controller is described apparatus.

  Also in Patent Document 2, a plurality of programmable controllers are connected to a single development support apparatus for creating a user program with a connection cable, and an ID number of an identification code of the programmable controller is registered in each programmable controller. At the same time, when creating a user program in the development support device, set the ID number of the identification code of the transferable programmable controller in this user program, and transfer it when transferring the user program from the development support device to the programmable controller. Compare the ID number set in the user program with the ID number set in the programmable controller, and transfer the user program only to the matching programmable controller to prevent erroneous transfer Development support system that was so that have been described.

JP 2004-62371 A JP-A-8-190484

  When a sequence program edited and created by a sequence program editing device is stored in any programmable controller among a plurality of programmable controllers, the corresponding sequence program must be stored in the programmable controller without error. Therefore, in the prior art described in Patent Documents 1 and 2 described above, when the ID number corresponding to the sequence program and the programmable controller is set, and the ID number of the sequence program matches the ID number of the programmable controller The sequence program can be transferred to the programmable controller.

  However, this prior art method associates a sequence program with a programmable controller. It is necessary to assign an ID number that designates a programmable controller in which the sequence program is stored to the edited sequence program.

  On the other hand, it is necessary to replace the sequence program used for the programmable controller with a new upgraded version of the sequence program. In this case, when replacing with a new upgraded version of the sequence program, the above-described conventional technique has to specify a programmable controller that replaces the sequence program with an ID number or the like, and replaces an incorrect sequence program due to malfunction or misunderstanding. That happens. That is, since it has not been confirmed whether the sequence program before and after the replacement is compatible, an incorrect sequence program is replaced.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sequence program replacement method that prevents an erroneous replacement from occurring when a sequence program stored in a programmable controller is replaced with a sequence program edited and created by a sequence program editing device. There is to do.

  In the sequence program replacement method according to the first aspect of the present invention, when a new sequence program is edited by the sequence program editing apparatus, the identification information of the sequence program to be replaced is stored in the sequence program together with the edited new sequence program. In addition, when the identification information of the sequence program stored in the programmable controller is detected, the identification information stored together with the new sequence program is searched, and there is a match with the detected identification information, the sequence of the programmable controller The program and the identification information are replaced with the sequence program of the programmable controller in which the new sequence program and the identification information are replaced.

  The sequence program replacement method of the invention according to claim 2 uses identification information for identifying a sequence program as a hash value of the sequence program by a hash function, and each time a sequence program is newly created and upgraded by a sequence program editing device, The identification information of the sequence program is added to the history of the identification information and stored together with the new sequence program, the hash value of the sequence program stored in the programmable controller is detected as the identification information, and stored together with the new sequence program. The history of identification information is searched, and when there is a match with the detected identification information, the sequence program of the programmable controller is replaced with the new sequence program. It was assumed to replace the programmable controller of the sequence program.

  Further, the invention according to claim 3 stores the identification value of the sequence program stored in the programmable controller from the history of the identification information, storing the identification value of the hash value and the correction amount of the sequence program in the upgrade. Is detected, the correction amount stored corresponding to the identification information is detected, and when the correction amount is equal to or less than a set value, the sequence program of the programmable controller is changed to the new sequence program. I replaced it.

  In the invention according to claim 4, when the correction amount exceeds a set value, it is displayed whether or not the sequence program is replaced, and the operator can select whether or not to execute the replacement. . As a result, when the amount of correction exceeds the set value, the operator can decide whether or not to replace in consideration of whether or not to replace.

  Further, the invention according to claim 5 searches the identification information stored together with the new sequence program edited by the sequence program editing device, and if there is no match with the identification information of the sequence program stored in the programmable controller, the sequence program Whether or not to perform replacement is displayed, and the operator can select whether or not to perform replacement. This makes it possible to store a completely new sequence program in the programmable controller, or to store a sequence program that is completely different from the sequence program stored so far.

According to the present invention, when replacing a sequence program stored in the programmable controller, the correspondence between the sequence programs before and after the replacement is confirmed, and the replacement is executed when the replacement is possible, so that the erroneous replacement of the sequence program can be prevented.
In addition, the identification information that identifies the sequence program is used as the hash value of the sequence program, so that a history of identification information can be automatically created each time a new sequence program is edited by upgrading, preventing human error. It can be replaced with a sequence program upgraded without error. Further, by storing the correction amount corrected by upgrading with the identification information, when the sequence program of the programmable controller is replaced with the upgraded sequence program, the correction amount of the sequence program before and after replacement can be taken into consideration.

It is a general | schematic block diagram of an example of the system to which the sequence program replacement method of this invention is applied. It is explanatory drawing explaining the outline | summary of the 1st Embodiment of this invention. It is an operation | movement flowchart of the replacement method of the sequence program in 1st Embodiment. It is explanatory drawing explaining the outline | summary of the 2nd Embodiment of this invention. It is an operation | movement flowchart of the replacement method of the sequence program in 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram of an example of a system to which the sequence program replacement method of the present invention is applied.
In this system, one or more programmable controllers are connected to one sequence program editing apparatus 1, and in the example shown in FIG. 1, a plurality of programmable controllers 2... Are connected via RS-232C, Ethernet (registered trademark). ) An example of connection via a communication path 3 such as connection or USB connection is shown.
The sequence program editing apparatus 1 is connected to a processor 11 via a bus 17, a memory 12, an input device 13 such as a keyboard, a display device 14, an interface 15 for connecting an external storage medium, and a communication interface 16. The memory 12 includes a ROM that stores system programs, a non-volatile memory that stores edited sequence programs, setting data, and the like, and a RAM that is used for calculations and the like. The interface 15 is for connecting to a storage medium such as a memory card or USB memory, and the communication interface 16 is for connecting to the communication path 3 connected to the programmable controllers 2.

  Each programmable controller 2 has substantially the same configuration, and only one programmable controller 2 is described in detail. The processor 21 is connected via a bus 28 to a memory 22, an input device 23 such as a keyboard, a display device 24, an interface 25 for connecting an external storage medium, a communication interface 26, and an input / output circuit 27. The memory 22 includes a ROM that stores system programs, a nonvolatile memory that stores sequence programs, setting data, and the like, a RAM, and the like. The RAM is used as an execution signal memory for storing various signals when the sequence program is executed, and as a work memory for storing the sequence program to be executed and performing various calculations. The interface 25 is for connecting to a storage medium such as a memory card or USB memory, the communication interface 26 is an interface for connecting to the sequence program editing apparatus 1 via the communication path 3, and the input / output circuit 27 is The programmable controllers 2... Are connected to various devices that are sequence-controlled.

  The configuration of the sequence program editing device 1 and the programmable controller 2... Described above is the same as the conventional one, and the sequence program is created and edited by the sequence program editing device 1, and each programmable controller 2. It is the same as the prior art in that various devices are subjected to sequence control by executing a stored sequence program. The difference from the conventional system is that when replacing the sequence program of the programmable controller 2... With the sequence program edited and created by the sequence program editing device 1, the correspondence between the sequence programs before and after the replacement can be confirmed and replaced. It is.

FIG. 2 is an explanatory diagram for explaining the outline of the first embodiment of the present invention.
When a new sequence program is edited and created by the sequence program editing apparatus 1, sequence program identification information V1, V2,... V8 that can be replaced with the sequence program is set and registered.
When the sequence program executed in the programmable controller 2 (denoted as the sequence program before update in FIG. 2) is to be replaced with the edited new scene program, it is set in the sequence program of the programmable controller 2. The identification information is read, the identification information is compared with the identification information set and registered in the sequence program newly edited by the sequence program editing apparatus 1, and if there is a match, Since it can be replaced, the sequence program of the programmable controller 2 is replaced with this new sequence program. When there is no matching identification information, the operator can select whether or not to replace. In this case, a sequence program newly stored in the programmable controller 2 or a sequence program completely different from the sequence program stored in the programmable controller 2 can be stored in the programmable controller.

  FIG. 3 is an operation flowchart of the sequence program replacement method according to the first embodiment.

  When a new sequence program is edited, the sequence program editing apparatus 1 sets and registers identification information V1, V2,... V8. Then, the programmable controller 2 to be replaced with this new sequence program is selected from the plurality of programmable controllers 2... Connected through the communication path 3, and the sequence program replacement operation shown in FIG. The processor 21 of the programmable controller 2 reads the identification information attached to the currently registered sequence program and transmits it to the sequence program editing apparatus 1 (step S10). The processor 11 of the sequence program editing apparatus 1 searches the identification information set for the newly edited sequence program for a match with the sent identification information (step S11). If it is detected (“Yes” in step S12), it can be replaced, and the new sequence program edited by the sequence program editing apparatus 1 and the identification information of the sequence program are transmitted to the programmable controller 2. The processor 21 of the programmable controller 2 replaces and stores the sent sequence program and identification information in place of the previously stored sequence program and identification information (step S13), and ends the replacement processing of the sequence program.

  On the other hand, if the identification information attached to the sequence program stored in the programmable controller 2 is not detected from the identification information set for the newly edited sequence program ("No" in step S12), The processor 11 of the sequence program editing device 1 displays a confirmation message as to whether or not the display device 14 can be replaced (step S14), and if the operator inputs from the input device 13 that the replacement is not performed (" No ”), the sequence program is not replaced without sending a new sequence program. Further, when a new sequence program is stored in the programmable controller 2 or a sequence program completely different from the sequence program stored in the programmable controller 2 is stored in the programmable controller, the operator can If the replacement is selected ("Yes" in step S15), the process proceeds to step S13, and the edited new sequence program and the identification information of the sequence program are transmitted to the programmable controller 2. Replace information.

  As described above, in this embodiment, the correspondence between the newly edited sequence program and the pre-update sequence program used in the programmable controller is confirmed, and the sequence program is replaced. Therefore, it is possible to reliably prevent replacement of an erroneous sequence program.

FIG. 4 is an explanatory diagram for explaining the outline of the second embodiment of the present invention.
In this example, a new sequence program is edited and created by upgrading the version. As the identification information, a unique value of the sequence program is used. As a unique value of the sequence program, a hash value obtained by applying a hash function to the sequence program itself can be used. Examples of general hash functions include MD5, SHA1, and CRC. In this embodiment, a cyclic redundancy check (CRC) value is used as the hash value of the sequence program. Further, in this embodiment, the correction amount from the previous version is also stored, and it is possible to select whether or not to replace the sequence program depending on the amount of the correction amount. Further, the number of changed nets is used as the correction amount.

  When a sequence program is newly created or upgraded by the sequence program editing apparatus 1 and a new sequence program is edited, the CRC information of the created and edited sequence program is used as identification information, and the identification information history of this sequence program Add to

  The example shown in FIG. 4 shows a state in which a new sequence program is edited by the sequence program editing apparatus 1 after four upgrades. At first (number 1), the CRC value “0x00112233” is stored as the unique value of this sequence program as identification information of the newly created sequence program, and the correction amount is the newly created sequence program. , Zero “0x0” is stored (the CRC value and the correction amount are expressed in hexadecimal). Similarly, the identification information (CRC value) “0x0F1E2423” of the second sequence program obtained by upgrading the new sequence program (first sequence program) and the correction amount (first value) (Correction amount from sequence program) “0x0F99”, sequence program identification information (CRC value) “0x81863E2F” obtained third after upgrading, and correction amount “0x0080” in this version upgrade are stored Similarly, the identification information (CRC value) “0xE1C63909” of the fourth sequence program obtained by the upgrade, the correction amount “0x0820”, and the identification of the fifth sequence program obtained by the upgrade Information (CRC value) “0 And 23F653D8 ", correction amount" 0x0010 "is stored.

  On the other hand, when the sequence program used in the programmable controller 2 (described as a sequence program before update in FIG. 4) is replaced with a new sequence program updated by the upgrade, the processor 21 of the programmable controller 2 CRC value as identification information is generated from the sequence program registered up to now (before update) (in FIG. 4, this indicates that the value of 0x81863E2F has been generated), and the sequence program editing apparatus 1 Send. The processor 11 of the sequence program editing apparatus 1 confirms that the identification information that matches the identification information of the CRC value that has been sent does not exist in the history of identification information added to the sequence program edited by the upgrade. When it is found and exists (in FIG. 4, it matches the identification information of the sequence program that has been upgraded twice with the number 3), the sequence program that has been replaced and updated by the upgrade (the fifth sequence) Program) to the programmable controller 2. The processor 21 of the programmable controller 2 replaces the stored sequence program with the new sequence program sent.

  However, in this embodiment, even if it is determined that the sequence program can be replaced, if the amount of correction in the upgrade from the sequence program before the update to the new sequence program exceeds a predetermined value, the operator Whether to replace or not can be selected.

  Further, even when the identification information (CRC value) of the sequence program before the update is not present in the history of identification information added to the sequence program edited by the version upgrade in the sequence program editing apparatus 1, The operator can select whether or not to replace.

  FIG. 5 is an operation flowchart of the sequence program replacement method in the second embodiment.

In the sequence program editing apparatus 1, when a new sequence program is edited,
A CRC value is obtained, and this CRC value is added as identification information of the sequence program to the history of identification information obtained by upgrading. In the example shown in FIG. 4, the version upgrade is performed four times, and the identification information (CRC value) “0x00112233” (first) for the newly created sequence program is used to determine the sequence program in the fourth version upgrade. A history of identification information up to identification information (CRC value) “0x0023F653D8” (fifth) is stored in correspondence with the newly edited sequence program.

  Then, the programmable controller 2 for replacing the sequence program is selected, and the sequence program replacing operation shown in FIG. 5 is started. The programmable controller 2 calculates the CRC value of the currently registered sequence program to obtain identification information, and transmits it to the sequence program editing apparatus 1 (step S20). The processor 11 of the sequence program editing apparatus 1 matches the transmitted identification information (CRC value) in the history of identification information (CRC value) set for the newly edited sequence program. It is searched whether there is a thing (step S21). If there is a match ("Yes" in step S22), the correction amount after the matched identification information is summed (step S23). That is, version upgrades are repeated from the sequence program stored in the programmable controller 2 at that time to a new sequence program edited by the sequence program editing apparatus 1, and the total correction amount is obtained by summing the correction amounts in each version upgrade. . In the example of FIG. 4, since the identification information of number 3 matches, the programmable controller 2 stores the sequence program of this third identification information, and is upgraded twice from this sequence program. Since the new sequence program having the second identification information is edited and created, the correction amounts “0x0820” and “0x0010” stored in correspondence with the fourth and fifth identification information are summed. Then, the correction amount until the version upgrade from the current sequence program to the new sequence program to be replaced is obtained.

  It is determined whether the correction amount exceeds the set value (step S24). If not exceeded, the new sequence program obtained by editing is transmitted to the programmable controller 2 as replaceable. The processor 21 of the programmable controller 2 replaces the stored sequence program with the new sequence program sent (step S25).

  On the other hand, when it is determined that the correction amount obtained in step S23 exceeds the set value (step S24), a confirmation message is displayed on the display device 14 as to whether the sequence program can be replaced (step S26). If an input is made from the input device 13 for replacement (step S27), the process proceeds to step S25, and the sequence program is replaced as described above. If it is input that no replacement is to be performed, the process ends without replacing the sequence program.

  If it is determined in step S22 that the identification information matching the identification information sent from the programmable controller 2 is not in the history of the identification information, the process proceeds to step S26, and as described above, the sequence program A confirmation message as to whether or not to replace is displayed on the display device 14 to allow the operator to select whether or not to replace. In this case, when a sequence program is newly stored in the programmable controller 2 or a sequence program completely different from the sequence program stored in the programmable controller 2 can be stored in the programmable controller.

  In the second embodiment, since the CRC value of the cyclic redundancy check (CRC) is used as the identification information as the hash value that is normally performed, no special means is required, and the sequence program version 1 of the sequence program is not necessary. By simply obtaining the CRC value and adding it to the history as identification information each time the upload is performed, the sequence program can be replaced without error by taking the correspondence of the sequence program before and after the replacement.

  In each of the above-described embodiments, the sequence program editing device 1 and the programmable controller 2 are connected via the communication path 3, but instead of this communication path, a removable storage medium such as a memory card or USB memory is used. Thus, data such as a sequence program may be transmitted and received between the sequence program editing device 1 and the programmable controller 2.

  In this case, when a new sequence program is edited and created by the sequence program editing apparatus 1, data in which identification information is added to the sequence program is created as shown in FIGS. The data is stored in an external storage medium such as a memory card or a USB memory, and the storage medium is attached to the interface 25 of the programmable controller 2. Based on the new sequence program and identification information stored in the storage medium, the programmable controller 2 The processor 21 executes the operation process shown in FIG. 3 or FIG. 5 to determine whether the sequence program can be replaced. If the replacement is possible, a new one stored in the storage medium is obtained. The sequence program (or identification information in the first embodiment) Also) in which it is sufficient to store the programmable controller 2.

1 Sequence Program Editing Device 2 Programmable Controller 3 Communication Path

Claims (5)

  When a new sequence program is edited by the sequence program editing device, identification information unique to another sequence program that can be replaced by the sequence program is stored together with the edited new sequence program, and stored in the programmable controller. When the unique identification information is detected and the identification information stored together with the new sequence program is searched and there is a match with the detected identification information, the sequence program of the programmable controller is replaced with the new sequence program. The programmable controller sequence program replacement method. The identification information for identifying the sequence program is used as the hash value of the sequence program based on the hash function, and each time a sequence program is newly created and upgraded by the sequence program editing device, the identification information is recorded in the history of the identification information together with the new sequence program. Add and remember the identification information,
When a hash value of a sequence program stored in a programmable controller is detected as identification information, a history of identification information stored together with the new sequence program is searched, and when there is a match with the detected identification information, the sequence of the programmable controller A sequence program replacement method for a programmable controller in which a program is replaced with the new sequence program.   When the identification value matching the sequence program identification information stored in the programmable controller is retrieved from the identification information history, storing the hash value identification information together with the revision amount of the sequence program in the upgrade 3. The correction amount stored corresponding to the matched identification information is extracted, and when the correction amount is equal to or less than a set value, the sequence program of the programmable controller is replaced with the new sequence program. Sequence program replacement method for programmable controllers.   4. The programmable controller sequence according to claim 3, wherein when the correction amount exceeds a set value, whether or not to replace the sequence program is displayed, and whether or not the replacement is executed can be selected by an operator. How to replace the program.   Search for identification information stored together with the new sequence program edited with the sequence program editing device, and if there is no match with the identification information of the sequence program stored in the programmable controller, display whether to replace the sequence program The sequence program replacement method for a programmable controller according to any one of claims 1 to 4, wherein an operator can select whether or not to perform replacement.

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