JP5669652B2 - Programmable controller system and memory organizing method - Google Patents

Description

  The present invention relates to a programmable controller system and a memory organizing method.

  In the user program of the conventional programmable controller, the memory address is directly described in the user program as means for designating the data area used for the calculation. In recent years, however, so-called variable programming has been used in which a user program is created without using a memory address by describing logic using variables in a user program and replacing variables with memory addresses during compilation. It has come to be used.

  On the other hand, the programmable controller needs to add / modify / delete a user program in order to correct a defect or adjust an operation even when the equipment is operating. In this case, RUN in-write that can modify the user program is used even when the programmable controller is executing the user program.

  As a conventional technique of RUN medium writing, a modified user program is downloaded and placed in a program memory of a CPU (Central Processing Unit) unit, and the user program is replaced by an END process after modification or after execution. Are gradually shifted in the END processing of a plurality of scans, and when a necessary space is created, a method for updating the user program by overwriting the changed portion with the changed program is known (for example, Patent Documents 1 and 2).

  In RUN write in variable programming, when compiling a modified user program, if each variable used before modification is assigned to a different memory address before and after modification, the data to be referred to is changed. Because of the difference, there is a problem that the program malfunctions depending on how the variable is used in the user program.

  Therefore, the variable and the allocation information to the memory address of the variable are saved in advance, and in the compilation at the time of RUN writing, the variable already allocated to the memory address is allocated to the memory address of the CPU unit. The program is prevented from malfunctioning by newly assigning the memory address of the CPU unit only to the added / changed variable without changing the.

JP 2001-142510 A JP-A-10-301605

  However, when addition / change / deletion of variables by frequent writing during RUN is frequently performed, unused areas to which variables are not allocated are scattered in the data memory area, resulting in a fragmented state. Also, when handling multiple variables such as array variables and structure variables at the same time, a continuous area for multiple variables is required, so the unused area in the data memory also increases, and the data memory usage efficiency increases. The reduction of the becomes remarkable.

  When adding an array variable or structure variable in a state where unused areas are scattered in the data memory, the continuous area cannot be secured even if the capacity can be sufficiently added in the entire free capacity, and the variable There was a problem that could not be added.

  The present invention has been made in view of the above. In a programmable controller system in which a programmable controller that handles advanced data structures such as array variables and structure variables and a programming tool are connected, a fragment is added when a variable is added. It is an object of the present invention to obtain a programmable controller system and a memory organizing method capable of organizing a memory area and securing a continuous area.

In order to achieve the above object, a programmable controller system according to the present invention includes a programmable controller that controls a control target based on a program, and a programming tool that manages the program used in the programmable controller. The programming tool is created by a user and variable assignment information storage means for storing variable assignment information for associating variables and sizes used in the program with addresses in the data storage means of the programmable controller. Compiling means for generating executable code executable by the programmable controller from the program and the variable assignment information, and the programmer program from the variable assignment information before the change. A movement target area extracting unit that extracts a fragmented area among the areas allocated to the variable in the data storage means of the controller as a movement target area, and the movement target area is allocated to another variable. A change destination address acquisition unit for acquiring a change destination address in the data storage means arranged so as to be continuous with an area, variable assignment information after assignment change including the movement target area and the change destination address, and the program The changed execution code acquisition unit for acquiring the execution code of the program after the assignment change through the compiling means, the change information from the execution code of the program before the assignment change of the execution code of the program after the assignment change is changed information The change information acquisition unit to acquire the A variable assignment management means having allocation change information generating unit that generates the changes of the execution code of the program caused by the allocation destination change in the data storage means as the allocation change information is generated by said variable allocation management unit Communication means for transmitting the change information and the assignment change information to the programmable controller , wherein the programmable controller stores program execution code for the program, and program execution for executing the program execution code. Means, data storage means for storing data to be used when the program execution means executes the execution code of the program, and rewriting processing of the execution code in the program storage means using the change information from the programming tool At the same time A memory organization execution means for performing a process of moving the data in the movement target area in the data storage means to the area specified by the change destination address according to the allocation change information from the ming tool. And

  According to the present invention, a data memory area can be efficiently used even when repeated execution of RUN write is repeatedly performed on a user program that uses advanced data structures such as array variables and structure variables in variable programming. Has the effect of enabling.

FIG. 1 is a block diagram schematically showing an example of a functional configuration of a programmable controller system according to this embodiment. FIG. 2 is a diagram illustrating an example of variable allocation information. FIG. 3A is a flowchart illustrating an example of a memory organization process according to the embodiment (part 1). FIG. 3-2 is a flowchart of an example of a memory organization process according to the embodiment (part 2). FIG. 3-3 is a flowchart illustrating an example of a memory organization process according to the embodiment (part 3). FIG. 4 is a diagram schematically showing an organized state of the data memory of the CPU unit. FIG. 5 is a diagram schematically illustrating an example in which the movement target area is divided into a predetermined size and moved to the change destination address.

  A programmable controller system and a memory organizing method according to embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a block diagram schematically showing an example of a functional configuration of a programmable controller system according to this embodiment. A programmable controller system performs a predetermined process by controlling a control target according to a user program (sequence program), and processes or manufactures a product. In this example, the programmable controller system includes a programming tool 10 that performs compilation processing of a user program executed by the CPU unit 20 and a CPU unit 20 that calculates control data for performing control processing of a control target.

  The programming tool 10 includes a program editor unit 11 that provides an I / F for a user to edit a user program, and correspondence between variables used in the user program and memory addresses in the data memory 24 of the CPU unit 20. Executable by the CPU unit 20 based on the variable assignment information storage unit 12 for storing variable assignment information indicating the relationship, the user program edited by the program editor unit 11 and the variable assignment information in the variable assignment information storage unit 12 A compiler 13 that generates an execution code, a variable allocation management unit 14 that manages variable allocation information, and a communication unit 15 that communicates with the CPU unit 20 are provided.

  In the user program edited by the program editor unit 11, the memory address is described using a variable, and the variable is converted into the memory address of the data memory 24 of the CPU unit 20 when the executable code is generated by the compiler 13. .

  The variable allocation information storage unit 12 stores pre-change variable allocation information, which is variable allocation information currently used by the CPU unit 20, and post-change variable allocation information generated by the variable allocation management unit 14 during memory organization processing. Shall be able to. The variable allocation information associates the start address of the storage location in the data memory 24 with the variable used in the user program. FIG. 2 is a diagram illustrating an example of variable allocation information. The variable allocation information manages the head address in the data memory 24, the name of the variable (variable name) assigned to the head address, and the size of the variable in association with each other. In FIG. 2, the variable 1 of size 2 is assigned to the start address “0x1000” of the data memory 24, the variable 2 of size 4 is assigned to the start address “0x1006”, and the variable 3 of size 4 is assigned to the start address “0x100C”. Is assigned, the variable 4 of size 2 is assigned to the head address “0x1010”, the variable 5 of size 6 is assigned to the head address “0x1014”, and between the variables 1 and 2, the variables 2 and 3 A case where the unused area is between the variable 4 and the variable 5 is shown.

  The variable assignment management unit 14 assigns a variable from the variable assignment information of the user program running on the CPU unit 20 when unused areas are scattered in a plurality of locations in the data memory 24 of the CPU unit 20. Change the variable assignment so that there are no unused areas. In order to achieve such a function, in this embodiment, the variable allocation management unit 14 includes a variable allocation information management unit 141, a movement target area extraction unit 142, a change destination address acquisition unit 143, and a post-change execution code. An acquisition unit 144, a change information acquisition unit 145, and an allocation change information generation unit 146 are included.

  The variable allocation information management unit 141 acquires the variable allocation information used in the CPU unit 20 from the variable allocation information storage unit 26 when executing the memory organization process, and stores it in the variable allocation information storage unit 12 as the pre-change variable allocation information. Store. In addition, when the post-change variable allocation information after memory organization is registered in the CPU unit 20, the post-change variable allocation information is stored in the variable allocation information storage unit 12 as pre-change variable allocation information.

  The movement target area extraction unit 142 uses the pre-change variable allocation information in the variable allocation information storage unit 12 to extract the fragmented use area as the movement target area. For example, an unused area is searched from the head address of the data memory 24 of the CPU unit 20 toward the end address using the pre-change variable allocation information, and the next unused address is searched from the head address of the area immediately after the found unused area. The area up to the start address of the used area is extracted as the movement target area.

  The change destination address acquisition unit 143 changes the address to which no variable is assigned (empty state) from the variable assignment information before change in the variable assignment information storage unit 12 toward the end address from the top address of the data memory 24 of the CPU unit 20. Search is performed, and the first hit address is acquired as the change destination address of the movement target area.

  The post-change execution code acquisition unit 144 generates an execution code of a user program (hereinafter referred to as a program after the assignment change) in which the assignment of the variable assigned to the movement target area is changed to the change destination address through the compiler 13.

  The change information acquisition unit 145 extracts, as change information, the amount that the program after the assignment change has changed from the execution code of the user program before the assignment change (hereinafter referred to as the program before the assignment change). The program before the allocation change may be obtained through the compiler 13 using the variable allocation information before the change in the variable allocation information storage unit 12 or may be acquired from the target CPU unit 20.

  The allocation change information generation unit 146 generates allocation change information from the start address and size of the movement target area extracted by the movement target area extraction unit 142 and the change destination start address acquired by the change destination address acquisition unit 143. To do. The change information and the allocation change information are transmitted to the CPU unit 20 via the communication unit 15.

  The CPU unit 20 includes a communication unit 21 that communicates with the programming tool 10, a program memory 22 that stores a user program, a user program execution unit 23 that executes a user program in the program memory 22, and a user program execution A data memory 24 for storing data used during execution of the user program by the unit 23, a memory organization executing unit 25 for organizing the fragmented data memory 24, and variable allocation of the user program written in the CPU unit 20 A variable allocation information storage unit 26 that stores information and an allocation change information storage unit 27 that stores allocation change information from the programming tool 10 are provided.

  Here, the memory organization execution unit 25 stores the change information (or the program after the assignment change) received from the programming tool 10 in the program memory 22 and uses the RUN write function to write the user program in the program memory 22. At the same time, the data in the data memory 24 is moved based on the allocation change information received from the programming tool 10. The movement of data in the data memory 24 is an area in which the data in the movement target area specified by the start address and size of the movement target area in the allocation change information is specified by the change start address in the allocation change information. Is done by moving to.

  Next, a memory organizing process in such a programmable controller system will be described. FIG. 3A to FIG. 3C are flowcharts illustrating an example of the memory organization process according to the embodiment.

  First, when the execution command for the data memory organizing operation of the target CPU unit 20 is input from the user to the programming tool 10, the data memory organizing execution is performed from the communication unit 15 of the programming tool 10 to the communication unit 21 of the CPU unit 20. A command is issued (step S11).

  When receiving the data memory organization command (step S12), the communication unit 21 of the CPU unit 20 requests the memory organization execution unit 25 to execute the data memory organization command (step S13). Further, the memory organization executing unit 25 determines whether or not the data memory organization is being executed when the data memory organization command is received (step S14). If data memory rearranging is not being executed (No in step S14), the data memory execution state indicating whether or not data memory rearranging processing is being executed is being executed (step S15), and data is transmitted to the programming tool 10 through the communication unit 21. A memory executable notification is transmitted (step S16). If data memory rearrangement is already being executed (Yes in step S14), a data memory execution notification indicating that it is being executed is transmitted to the programming tool 10 through the communication unit 21 (step S17).

  When a data memory executable notification / data memory execution notification is received from the CPU unit 20 (step S18), the variable allocation information management unit 141 of the variable allocation management unit 14 of the programming tool 10 stores the CPU unit in the variable allocation information storage unit 12. It is checked whether the variable allocation information (pre-change variable allocation information) used in 20 is held (step S19). If the pre-change variable allocation information is not retained (No in step S19), the variable allocation information management unit 141 transmits a variable allocation information acquisition request to the CPU unit 20 through the communication unit 15 (step S19). S20).

  Upon receiving the variable assignment information acquisition request (step S21), the memory organization executing unit 25 of the CPU unit 20 extracts the variable assignment information of the currently operating user program from the variable assignment information storage unit 26, and the programming tool through the communication unit 21. 10 (step S22). When receiving the variable assignment information of the user program running on the CPU unit 20 (step S23), the variable assignment information management unit 141 of the programming tool 10 stores the variable assignment information storage unit 12 as the pre-change variable assignment information.

  If the variable assignment information (pre-change variable assignment information) of the user program running on the CPU unit 20 already exists in the variable assignment information storage unit 12 of the programming tool 10 (Yes in step S19). There is no need to obtain the CPU unit 20 again.

  After step S23 or in the case of Yes in step S19, the movement target area extraction unit 142 of the variable allocation management unit 14 of the CPU unit 20 uses the unused area in the data memory 24 of the CPU unit 20 in the pre-change variable allocation information. Is searched to determine whether unused areas are scattered in a plurality of places (whether there are two or more unused areas) (step S24).

  When the unused area is scattered in a plurality of locations in the data memory 24 (Yes in step S24), the movement target area extracting unit 142 determines the head of the data memory 24 of the CPU unit 20 from the pre-change variable allocation information. The unused area is searched from the address to the end address, and the movement target area is extracted. For example, the area from the head address of the area immediately after the first unused area found to the head address of the next unused area is set as the movement target area.

  Next, the change destination address acquisition unit 143 of the variable allocation management unit 14 determines the change destination top address of the extracted movement target area (step S26). Here, the first address of the unused area found first when the unused area is searched from the head address of the data memory 24 toward the end address is set as the change destination head address.

  The variable allocation information management unit 141 acquires the variable and size assigned to the movement target area extracted by the movement target area extraction unit 142 from the variable allocation information before the allocation change, and acquires the acquired variable and size. The variable allocation information after the allocation change newly associated with the change destination head address acquired by the change destination address acquisition unit 143 is generated (step S27).

  Thereafter, the post-change execution code acquisition unit 144 of the variable allocation management unit 14 uses the compiler 13 to change the variable allocated to the movement target area to the change destination head address based on the variable allocation information after the allocation change. The execution code (program after the assignment change) is generated (step S28).

  Next, the change information acquisition unit 145 of the variable assignment management unit 14 extracts change information that is a changed part from the program before the assignment change of the program after the assignment change (step S29). The program before the assignment change may be acquired from the target CPU unit 20, for example, or the program may be generated through the compiler 13 from the variable assignment information before the assignment change.

  Furthermore, the variable allocation management unit 14 generates allocation change information including the start address and size of the movement target area, and the change destination start address (step S30), and transmits it to the CPU unit 20 together with the program after the allocation change (step S30). S31).

  When the memory rearrangement execution unit 25 of the CPU unit 20 receives the program after the allocation change and the allocation change information from the programming tool 10 (step S32), after storing the program after the allocation change in the program memory 22 (step S33). ), The user program in the program memory 22 is modified using the RUN in-write function, and at the same time, the data in the data memory 24 is moved based on the allocation change information received from the programming tool 10 (step S34). The data in the data memory 24 is moved by, for example, acquiring data existing in a range specified by the start address and size of the movement target area in the allocation change information, and moving the data in the range specified by the change destination start address. Is done by moving.

  Thereafter, when the modification of the user program and the data movement are completed, the memory organization executing unit 25 of the CPU unit 20 transmits an assignment change completion notification to the programming tool 10 through the communication unit 21 (step S35).

  When the variable allocation information management unit 141 of the variable allocation management unit 14 of the programming tool 10 receives the allocation change completion notification from the CPU unit 20 through the communication unit 15 (step S36), the variable allocation information is changed to the variable allocation information after the change. Update (step S37). Specifically, the variable assignment information after change in the variable assignment information storage unit 12 is updated to the variable assignment information before change. Further, the variable assignment information stored in the variable assignment information storage unit 26 of the CPU unit 20 is also updated (step S38).

  The movement target area extraction unit 142 analyzes the variable allocation information after the change, and determines whether the data memory 24 has only one used area and one unused area (step S39). If there is not one used area or unused area (No in step S39), the process returns to the search for the movement target area in step S25, and the above-described processing is repeatedly executed. If both the used area and the unused area are one (Yes in step S39), the memory organizing is completed and a memory organizing completion notice is transmitted to the CPU unit 20 through the communication unit 15 (step S40). .

  When the memory organizing execution unit 25 of the CPU unit 20 receives the memory organizing completion notification through the communication unit 21 (step S41), the data memory execution state is not executed (step S42), and the program tool 10 is normally terminated through the communication unit 21. A notification is transmitted (step S43).

  When the programming tool 10 receives the normal end notification through the communication unit 15 (step S44), the programming tool 10 notifies the user of the completion of memory organization (step S45). This completes the memory organization process.

  Next, as a specific example, a case will be described in which the memory organization process is performed on the data memory 24 to which variables are assigned with the variable assignment information shown in FIG. FIG. 4 is a diagram schematically showing an organized state of the data memory of the CPU unit. In FIG. 4, the upper diagram is variable allocation information, the interrupted diagram is a diagram schematically showing the usage status of addresses in the data memory 24 in the CPU unit 20, and the lower diagram is in the program memory 22. It is a figure which shows the state of a program typically.

  FIG. 4A shows a state before performing the memory organizing process, and shows a state in which the memory organizing process has been fragmented by the RUN writing process. That is, the variable 1 having a size of 2 bytes is allocated to the head address “0x1000”, the variable 2 having a size of 4 bytes is allocated to the head address “0x1006”, and the size of 4 bytes is allocated to the head address “0x100C”. Variable 3 is allocated, variable 4 having a size of 2 bytes is allocated to the head address “0x1010”, and variable 5 having a size of 6 bytes is allocated to the head address “0x1014”. Also, unused areas are between variables 1 and 2, between variables 2 and 3, and between variables 4 and 5.

  Further, in the program A in the program memory 22, the variable 2 (address “0x1006”) and the variable 4 (address “0x1010”) are used, and in the program B, the variable 2 (address “0x1006”) and the variable 5 ( Address “0x1014”) is used.

  When the above-described memory organizing process is executed on the data memory 24 in such a state, first, after the first unused area from the start address (0x1000) to the end address (0x1019) of the data memory 24 The area to which the variable is assigned is searched. Here, the variable 2 having a head address “0x1006” and a size of 4 bytes is extracted as the movement target area.

  Further, the first unused area is searched from the head address of the data memory 24 toward the tail address as the change destination address. Here, an unused area having a head address of “0x1002” and a size of 4 bytes is extracted, and “0x1002” is acquired as the change destination head address.

  As described above, in variable allocation information before change, variable 2 is allocated as 4 bytes from address “0x1006”, but in variable allocation information after change, variable 2 is allocated as 4 bytes from address “0x1002”. . In addition, a program after the allocation change is generated using the post-change variable allocation information, and change information that is a changed part from the program before the allocation change is acquired. Furthermore, allocation change information including an address “0x1006” of the movement target area, a size of 4 bytes, and a change destination head address “0x1002” is generated.

  Next, as shown in FIG. 4B, rewriting processing of the user program in the program memory 22 is performed. This rewriting process is performed using the RUN writing function, and only the part corresponding to the acquired change information is performed. Here, the part including the variable 2 of the programs A and B is changed. At the same time, the variable 2 is moved in the data memory 24. This movement process is performed based on the allocation change information. The post-change variable assignment information is pre-change variable assignment information.

  By this process, it is confirmed whether both the unused area and the used area are one. However, since both are not one, the memory organizing process is further performed. As in the case of FIG. 4A, the start address is “0x100C” as the movement target area, the variables 3 and 4 having a size of 6 bytes are extracted, and “0x1006” is acquired as the change destination address.

  Thus, in the variable allocation information before change, the variable 3 is allocated as 4 bytes from the address “0x100C”, and the variable 4 is allocated as 2 bytes from the address “0x1010”. However, in the variable allocation information after change, The variable 3 is allocated 4 bytes from the address “0x1006”, and the variable 4 is allocated 2 bytes from the address “0x100A”. In addition, a program after the allocation change is generated using the post-change variable allocation information, and change information that is a changed part from the program before the allocation change is acquired. Furthermore, allocation change information including an address “0x100C” of the movement target area, a size of 6 bytes, and a change destination head address “0x1006” is generated.

  Next, as shown in FIG. 4C, the rewriting process of the user program in the program memory 22 is performed. This rewriting process is performed using the RUN writing function, and only the part corresponding to the acquired change information is performed. Here, the part including the variable 4 of the program A is changed. At the same time, movement processing of the variables 3 and 4 is performed in the data memory 24. This movement process is performed based on the allocation change information. The post-change variable assignment information is pre-change variable assignment information.

  By this process, it is confirmed whether both the unused area and the used area are one. However, since both are not one, the memory organizing process is further performed. Similarly to the case of FIG. 4A, the start address is “0x1014” as the movement target area, the variable 5 having a size of 6 bytes is extracted, and “0x100C” is acquired as the change destination address.

  Thus, in the pre-change variable allocation information, the variable 5 is allocated as 6 bytes from the address “0x1014”, but in the post-change variable allocation information, the variable 5 is allocated from 6 bytes from the address “0x100C”. Further, a program after the allocation change is generated using the post-change variable allocation information, and change information that is a changed part from the program before the allocation change is acquired. Furthermore, allocation change information including an address “0x1014” of the movement target area, a size of 6 bytes, and a change destination head address “0x100C” is generated.

  Next, as shown in FIG. 4D, the rewriting process of the user program in the program memory 22 is performed. This rewriting process is performed using the RUN writing function, and only the part corresponding to the acquired change information is performed. At the same time, the process of moving the variable 5 is performed in the data memory 24. Here, the part including the variable 5 of the program B is changed. This movement process is performed based on the allocation change information. The post-change variable assignment information is pre-change variable assignment information.

  By this processing, it is confirmed whether both the unused area and the used area become one. As a result of the above processing, variables 1 to 5 are continuously assigned to addresses “0x1000” to “0x1010”, and addresses “0x1012” to “0x1018” are unused areas. Therefore, the memory organizing process ends.

  When the movement target area is large, it takes time to move the data, and the scan time may be extended. In such a case, it is possible to suppress an increase in scan time by dividing the movement target area in a certain size and moving the area in multiple times. At this time, it is possible to divide the movement target area with a size equal to or smaller than the maximum data size obtained in advance so as not to extend the scan time by an experiment.

  FIG. 5 is a diagram schematically illustrating an example in which the movement target area is divided into a predetermined size and moved to the change destination address. In this figure, the upper diagram is variable allocation information, and the lower diagram is a diagram schematically showing the use status of addresses in the data memory 24 in the CPU unit 20. Here, a case is shown in which the movement target area is divided into 8 Kbytes and moved in two steps.

  First, as shown in the variable allocation information in FIG. 5A, before the memory organization process, variables 10 to 13 having a size of 16 Kbytes are allocated to the head address “0x1002”. Further, the area before the variable 10 and after the variable 13 is an unused area.

  When the above-described memory organizing process is executed on the data memory 24 in such a state, first, after the first unused area from the start address (0x1000) to the end address (0x5002) of the data memory 24 The area to which the variable is assigned is searched. Here, the variables 10 to 13 having the head address “0x1002” and the size of 16 Kbytes are extracted as the movement target area. However, since the size of the movement target area exceeds a predetermined size (= 8 Kbytes), 8 Kbytes are selected as the movement target area from the head address “0x1002”.

  Further, the first unused area is searched from the head address of the data memory 24 toward the tail address as the change destination address. Here, an unused area having a head address of “0x1000” and a size of 2 Kbytes is extracted, and “0x1000” is acquired as the change destination head address.

  As described above, in the variable assignment information before change, the variables 10 to 11 are assigned as 8 Kbytes from the address “0x1002”, but in the variable assignment information after change, the variables 10 to 11 are assigned as 8 Kbytes from the address “0x1000”. It is done. In addition, a program after the allocation change is generated using the post-change variable allocation information, and change information that is a changed part from the program before the allocation change is acquired. Furthermore, allocation change information including an address “0x1002” of the movement target area, a size of 8 Kbytes, and a change destination head address “0x1000” is generated.

  Next, the rewriting process of the user program in the program memory 22 is performed. This rewriting process is performed using the RUN writing function, and only the part corresponding to the acquired change information is performed. At the same time, the variables 10 to 11 are moved in the data memory 24 as shown in FIG. This movement process is performed based on the allocation change information. The post-change variable assignment information is pre-change variable assignment information.

  By this process, it is confirmed whether both the unused area and the used area are one. However, since both are not one, the memory organizing process is further performed. Similarly to the case of FIG. 5A, the first address is “0x3002” as the movement target area, the variables 12 to 13 having the size of 8 Kbytes are extracted, and “0x3000” is acquired as the change destination address.

  Thus, in the pre-change variable allocation information, the variables 12 to 13 are allocated as 8 Kbytes from the address “0x3002”, but in the post-change variable allocation information, the variables 12 to 13 are allocated from the address “0x3000” to 8 Kbytes. . In addition, a program after the allocation change is generated using the post-change variable allocation information, and change information that is a changed part from the program before the allocation change is acquired. Furthermore, allocation change information including an address “0x3002” of the movement target area, a size of 8 Kbytes, and a change destination head address “0x3000” is generated.

  Next, the rewriting process of the user program in the program memory 22 is performed. This rewriting process is performed using the RUN writing function, and only the part corresponding to the acquired change information is performed. At the same time, the variables 12 to 13 are moved in the data memory 24 as shown in FIG. This movement process is performed based on the allocation change information. The post-change variable assignment information is pre-change variable assignment information. Through the above processing, data of a predetermined length or more is divided into a predetermined length and moved while suppressing an increase in scan time.

  By this processing, it is confirmed whether both the unused area and the used area become one. As a result, the variables 10 to 13 are continuously assigned to the addresses “0x1000” to “0x5000”, the addresses “0x5000” to “0x5002” are unused areas, and the used area and the unused area are both 1 As a result, the memory organizing process ends.

  In the above description, the case where the unused area is searched from the start address to the end address of the data memory 24 and the variable existing immediately after the first unused area is extracted as the movement target area is shown. However, the present invention is not limited to this, and it is possible to extract an arbitrary variable that exists in a jumping state across an unused area.

  According to this embodiment, the movement target area to which the variable in the data memory 24 is assigned and the unused area closest to the head address of the data memory 24 are extracted, and the unused area is continuous. Since the variable assignment is changed as described above, it is possible to arrange the data memory 24 in which the unused areas are scattered by repeating the addition and deletion of the variables by the write during RUN, and to secure the continuous unused areas. It has the effect.

  In addition, when the movement target area is large, the movement target area is divided into a plurality of parts and moved in a plurality of times, so that it is possible to suppress an increase in scan time due to data movement.

  As described above, the programmable controller according to the present invention is suitable for variable programming using advanced data structures.

DESCRIPTION OF SYMBOLS 10 Programming tool 11 Program editor part 12 Variable allocation information storage part 13 Compiler 14 Variable allocation management part 15,21 Communication part 20 CPU unit 22 Program memory 23 User program execution part 24 Data memory 25 Memory arrangement execution part 26 Variable allocation information storage part 27 Allocation change information storage unit 141 Variable allocation information management unit 142 Movement target area extraction unit 143 Change destination address acquisition unit 144 Changed execution code acquisition unit 145 Change information acquisition unit 146 Allocation change information generation unit

Claims (6)

In a programmable controller system comprising: a programmable controller that controls a control target based on a program; and a programming tool that manages the program used in the programmable controller.
The programming tool is:
Variable assignment information storage means for storing variable assignment information for associating variables and sizes used in the program and addresses in the data storage means of the programmable controller;
Compiling means for generating executable code executable by the programmable controller from a program created by a user and the variable allocation information;
A movement target area extracting unit that extracts a fragmented area as a movement target area from among the areas allocated to the variables in the data storage means of the programmable controller from the variable allocation information before the change, the movement target A change destination address acquisition unit for acquiring a change destination address in the data storage means that arranges an area so as to be continuous with an area assigned to another variable, and an assignment change including the movement target area and the change destination address A variable execution information acquisition unit for acquiring an execution code of the program after the allocation change from the variable allocation information after the program and the compiling means; a program before the allocation change of the execution code of the program after the allocation change A change information acquisition unit for acquiring a change part from the execution code of the change code as change information, and the movement target area Variable with the data allocation changing information generating unit that generates the changes as allocation change information of the execution code of the program that allocated destination caused by the change in the storage means of the variables by using said change destination address Allocation management means ;
Communication means for transmitting the change information generated by the variable assignment management means and the assignment change information to the programmable controller;
With
The programmable controller is
Program storage means for storing an execution code of the program;
Program execution means for executing an execution code of the program;
The data storage means for storing data used when the execution code of the program is executed by the program execution means;
Rewriting the execution code in the program storage means using the change information from the programming tool, and at the same time in the movement target area in the data storage means according to the assignment change information from the programming tool Memory organization execution means for performing processing for moving data to an area designated by the change destination address ;
A programmable controller system comprising: The movement target area extraction unit uses the variable allocation information to search for an unused area that is not assigned to a variable in the program from the start address to the end address in the data storage unit of the programmable controller. 2. The programmable controller system according to claim 1 , wherein an area from the first address of an area immediately after the first unused area to the first address of the next unused area is extracted as the movement target area. . When the area from the start address of an area immediately after the first unused area to the start address of the next unused area is larger than a predetermined size, the movement target area extraction unit divided into multiple regions of the following sizes, one of the divided regions and the moving target region,
The programming tool and the programmable controller, for each of the divided areas, the programmable controller system of claim 2, which comprises carrying out the process of moving the data in the data SL憶means of the programmable controller. The change destination address acquisition unit uses the variable allocation information to search the unused area from the start address to the end address in the data storage unit of the programmable controller, and finds the unused area that was found first. The programmable controller system according to claim 1 , wherein the programmable controller system is acquired as the change destination address. The memory organization executing means any said program execution means and rewriting the executable code of the program during execution of the program, according to claim 1 to 4, characterized in that for moving data in said data storage means The programmable controller system as described in any one. Program storage means for storing the execution code of the program, program execution means for executing the execution code of the program, and data storage means for storing data used when executing the execution code of the program by the program execution means, A variable used in the program in a programmable controller system in which a programmable controller that controls a control target based on a program and a programming tool that manages the program used in the programmable controller are connected via a communication line. In the memory organizing method for organizing the area in the data storage means to which
Said programming tool variables and sizes that are used in the program, and the variable in the data storage means of the programmable controller from the variable allocation information for associating the address in said data storage means of the programmable controller Extracting a fragmented area among the allocated areas as a movement target area;
The programming tool obtains a change destination address in the data storage means for arranging the movement target area so as to be continuous with an area assigned to another variable;
The programming tool obtains the execution code of the program after the allocation change from the variable allocation information after the allocation change including the movement target area and the change destination address, and the program;
The programming tool is a step of obtaining a change location from the execution code of the program before the assignment change of the execution code of the program after the assignment change as change information;
The programming tool generates allocation change information including the movement target area and the change destination address;
The programming tool transmits the change information and the allocation change information to the programmable controller;
The programmable controller receives the change information and the allocation change information;
The programmable controller rewrites the execution code of the program in the program storage unit based on the change information, and simultaneously changes the data in the movement target area in the data storage unit according to the allocation change information. Moving to the area specified by the destination address;
A method for organizing memory.

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