JP2010049484A - Program edit device of programmable logic controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce edit errors by automatically changing, registering and deleting variables in dividing/combining program organization units (POUs), in a device for editing a sequence program of a programmable logic controller for each POU. <P>SOLUTION: In dividing POUs, a POU division/combination control part 160 adds a local variable shared by divided POUs to a global variable worksheet as a global variable and registers the added global variable in a divided local variable worksheet as an external reference variable. In combining POUs, the POU division/combination control part 160 converts the global variable shared as the external reference variable only by POUs before combination into a local variable, registers the converted local variable in a combined local variable worksheet and deletes the global variable from the global variable worksheet. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for editing a sequence program of a programmable logic controller in units of program components, and more particularly to a program editing device for dividing / combining program components.

  2. Description of the Related Art Conventionally, a technique for creating and editing a sequence program executed by a programmable logic controller (hereinafter abbreviated as PLC) in units of program components (Program Organization Unit: hereinafter abbreviated as POU) is known. Here, the POU is composed of a program worksheet for defining logic and a local variable worksheet for registering variables used in the program worksheet as local variables. Variables referred to by a plurality of POUs are registered as global variables in the global variable worksheet, and are registered as external reference variables in the local variable worksheet of each POU.

Since it is desirable to create a POU for each function group, conventionally, when developing a program, an editing apparatus that divides one POU into a plurality of parts or conversely combines a plurality of POUs into one has been proposed. ing. For example, Patent Document 1 describes a programming tool that divides one POU into a plurality of parts and assigns the divided POUs to a plurality of PLCs. Patent Document 2 describes a program creation apparatus that combines a plurality of POUs into one and automatically generates a cross reference, which is memory reference information for the combined POUs.
Japanese Patent Laid-Open No. 10-333721 JP-A-11-85232

  FIG. 12 shows the overall configuration of a conventional program editing apparatus. In the editing apparatus 100, a CPU 120, a work memory 130, an input device 140 such as a keyboard and a mouse, an output device 150 such as a display device, a POU editing control unit 170, and a PLC program memory 180 are connected to a bus 110. The PLC program memory 180 stores a program worksheet 182 and local variable worksheet 183 of the POU 181 and a global variable worksheet 184.

  The POU editing control unit 170 reads the program worksheet 182, the local variable worksheet 183, and the global variable worksheet 184 from the program memory 180, displays them on the display unit of the output device 150, and accepts editing operations from the input device 140. Then, the program editor operates the input device 140 and repeats copy / cut / paste of the program worksheet 182 and the local variable worksheet 183 in units of worksheets or symbols, thereby dividing / combining the POU 181. Yes.

  By the way, when the local variable worksheet 183 is copied when dividing the POU 181, local variables that are not used in the divided program worksheet are also copied, so it is necessary to remove unnecessary variables. Further, a global variable shared by a plurality of POUs after division must be added to the global variable worksheet, changed to an external reference variable, and registered in a plurality of divided local variable worksheets. When combining POUs, create local variable worksheets by extracting the local variables used in the combined POUs from the program worksheet, and change the global variables that were shared only in the POUs prior to combining to local variables. It is also necessary to register the local variable worksheet and delete it from the global variable worksheet.

  However, according to the conventional program editing apparatus 100, such change, registration, and deletion of variables are performed manually by the editor. For this reason, before dividing / combining POUs, many worksheets are collated, how variables are used, copy / cut / paste worksheets, variables are changed, registered, and deleted, It was necessary to collate the worksheets again, determine whether the variables are appropriate, and repeat a series of operations if they are not appropriate. Therefore, there are problems that it takes time and effort to edit the program, and that editing mistakes are likely to occur. In particular, when changing the registration of a variable, it is easy to make a mistake between a local variable and a global variable.

  The present invention has been made to solve the above-described problems, and an object thereof is programmable logic that can automate variable change, registration, and deletion and reduce editing mistakes when dividing / joining POUs. -To provide a controller editing device.

In order to solve the above problems, the program editing apparatus of the present invention uses a program editing means for editing a sequence program executed by a PLC in units of POUs, a program worksheet for defining POU logic, and a program worksheet. Program memory that stores a local variable worksheet that registers registered local variables, a global variable worksheet that registers global variables shared by multiple POU program worksheets, and a single POU A program worksheet corresponding to the divided POU and a program dividing means for creating a local variable worksheet,
(1) The program dividing means adds a local variable shared by the divided POU as a global variable to the global variable worksheet and registers it as an external reference variable in the divided local variable worksheet. To do.
(2) When the program dividing means adds a global variable to the global variable worksheet, it detects duplicate registration of the variable and notifies the program editor.

The present invention also provides a program editing apparatus suitable for POU combination. In addition to the editing means and the program memory, the editing apparatus includes a program combining unit that combines a plurality of POUs into one and creates a program worksheet and a local variable worksheet corresponding to the combined POUs,
(3) The program combining means changes a global variable shared as an external reference variable only in the POU before combining into a local variable, registers it in the combined local variable worksheet, and deletes it from the global variable worksheet. It is characterized by.
(4) The program combining means notifies the program editor of local variable duplication when creating a local variable worksheet, thereby avoiding duplication registration.

According to the program editing apparatus of (1) above, when a POU is divided, a newly derived global variable can be automatically added to the global variable worksheet, and can be correctly registered as an external reference variable in the local variable worksheet. .
According to the program editing apparatus of the above (2), there is an effect that it is possible to avoid overlapping registration of global variables due to division.

According to the program editing apparatus of (3) above, when combining POUs, the global variable before the combination can be changed to a local variable and correctly registered in the local variable worksheet, and can be automatically deleted from the global variable worksheet. .
According to the program editing apparatus of (4) above, there is an effect that it is possible to avoid overlapping registration of local variables accompanying the combination.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an overall configuration of a program editing apparatus 1 for editing a PLC sequence program. The editing apparatus 1 includes an input device 140, an output device 150, a POU editing control unit 170, a PLC program memory 180, and the like that function in the same manner as a conventional device (see FIG. 12). A POU division / combination control unit 160 that controls registration and deletion is provided.

  FIG. 2 illustrates a POU 1 program worksheet stored in the PLC program memory 180. Here, the logic included in POU1 is defined in four program worksheets, worksheet 1W201, worksheet 2W202, worksheet 3W203, and worksheet 4W204.

  FIG. 3 illustrates a local variable worksheet for POU1. In this local variable worksheet, variables used in the four program worksheets W201 to W204 are registered in the form of a list showing the variable names, data types, and types. In the type item, a local variable used only in POU 1 among the variables is displayed as “VAR”, and an external reference variable used in other POUs is displayed as “VAR_EXTERNAL”.

  FIG. 4 illustrates the global variable worksheet before division. In this global variable worksheet, global variables shared by POU1 and other POUs are registered in the form of a list showing the variable names, data types, and types. In the type item, the global variable is displayed as “VAR_GLOBAL”. 2 to 4 are displayed on the output device 150 alone or in a required combination.

  Next, POU division processing by the POU division / combination control unit 160 as program division means will be described. In the following, as shown by a chain line in FIG. 2, POU1 is divided into two, POU2 including two program worksheets, worksheet 1W201 and worksheet 3W203, and two sheets of worksheet 2W202 and worksheet 4W204. Processing for generating POU3 including a program worksheet will be described.

  As shown in the flowchart of FIG. 9, when dividing POU1, the POU division / combination control unit 160 first divides the POU1 program worksheet and places the worksheet 1W201 and the worksheet 3W203 in the designated area of the PLC program memory 180. The program worksheet corresponding to POU2 is created by copying in the designated order, and the worksheet 2W202 and worksheet 4W204 are similarly copied to create a program worksheet corresponding to POU3 (S301). At this point, the local variable worksheets for POU2 and POU3 are blank.

  Next, variables are extracted one by one from the local variable worksheet of POU1 (S302), and it is determined whether or not the variables are shared by the POU2 and POU3 program worksheets (S303). If not shared, the variable is registered as a local variable unique to POU2 or POU3 in the respective local variable worksheet (S304). If it is shared, add it to the global variable worksheet as a global variable.

  Here, in order to avoid duplicate registration of global variables, the variable name of the variable to be added is compared with the variable name of the registered variable to check for duplicate global variables (S305). If not overlapped, the variable is added to the global variable worksheet (S306) and registered as an external reference variable in the local variable worksheet of POU2 and POU3 (S307). If they overlap, the program editor is notified of the duplication of variables with a predetermined message (S309), and error processing is performed. Then, all the variables of POU1 are processed (S308), the local variable worksheets of POU2 and POU3 are completed, the global variable worksheet is updated, and the division work is finished.

  5 and 6 illustrate the POU2 and POU3 local variable worksheets after the division, respectively, and FIG. 7 illustrates the global variable worksheet after the division. Since both the variable mMDSLAS and the variable mRMCK shown in FIGS. 5 and 6 are used in both POU2 and POU3, they are registered as global variables (VAR_GLLOBAL) in the global variable worksheet shown in FIG. Are registered as external reference variables (VAR_EXTERNAL) in the local variable worksheet shown in FIG.

  Next, POU combination processing by the POU division / combination control unit 160 as program combination means will be described. In the following, processing when POU2 and POU3 are combined into one to generate POU4 including a total of four program worksheets including POU2 worksheet 1W201, worksheet 3W203, POU3 worksheet 2W202, and worksheet 4W204. Will be described.

  As shown in the flowchart of FIG. 10, when combining POU2 and POU3, the POU division / combination control unit 160 first sets the POU2 worksheet 1W201, worksheet 3W203, and POU3 worksheet in the designated area of the PLC program memory 180. 2W202 and worksheet 4W204 are copied in a specified order to create a set of program worksheets corresponding to POU4 (S401). At this point, the POU4 local variable worksheet is blank.

  Next, all local variables are extracted from the POU2 local variable worksheet and registered in the POU4 local variable worksheet (S402). Subsequently, local variables are taken out one by one from the local variable worksheet of POU 3 (S403), the variable names are compared with the variable names of registered variables, and duplicates of local variables are checked (S404). If not, the local variable is registered in the local variable worksheet of POU 4 (S405). If there is a duplication, the program editor is notified of the duplication of the variable with a predetermined message (S406) to avoid duplication registration. Then, all local variables in POU3 are processed (S407), and a local variable worksheet for POU4 is created.

  Subsequently, as shown in the flowchart of FIG. 11, all external reference variables are extracted from the local variable worksheet of POU2 and registered in the local variable worksheet of POU4 (S501). Next, external reference variables are extracted one by one from the local variable worksheet in POU 3 (S502), and it is determined whether or not they are already registered in the local variable worksheet in POU 4 (S503). If not registered, the external reference variable is registered in the local variable worksheet of POU4 (S507). If already registered, it is determined whether or not another POU is referring to this external reference variable (S504).

  If another POU is referencing, it is determined that the variable is still a global variable, and the process returns to step S502 to extract the next external reference variable. If no other POU refers to it, it is determined that the variable has changed from a global variable to a local variable, and a registration change of the variable is notified to the program editor by a predetermined message (S505). Thereafter, the global variable is changed to a local variable, registered in the local variable worksheet of POU4, and deleted from the global variable worksheet (S506). In this way, all external reference variables are processed (S508), the local variable worksheet of POU4 is completed, the global variable worksheet is updated, and the joining operation is completed.

  FIG. 8 illustrates the combined global variable worksheet. In this embodiment, POU4 is generated by combining POU2 and POU3 divided from POU1. For this reason, the variable mMDSLAS and the variable mRMCK registered in the global variable worksheet before joining (see FIG. 7) change from the global variable to the local variable specific to POU4 with the joining, and the joined global shown in FIG. It is automatically deleted from the variable worksheet.

1 is a block diagram of a program editing apparatus showing an embodiment of the present invention. It is a schematic diagram which shows the program worksheet of POU1. It is a schematic diagram which shows the local variable worksheet of POU1. It is a schematic diagram which shows a global variable worksheet. It is a schematic diagram which shows the local variable worksheet of POU2. It is a schematic diagram which shows the local variable worksheet of POU3. It is a schematic diagram which shows the global variable worksheet after a division | segmentation. It is a schematic diagram which shows the global variable worksheet after a coupling | bonding. It is a flowchart which shows the division | segmentation process of POU. It is a flowchart which shows the coupling | bonding process of POU. It is a flowchart which shows the joint process following FIG. It is a block diagram which shows the conventional program editing apparatus.

Explanation of symbols

1 Program Editing Device 140 Input Device 150 Output Device 160 POU Division / Combination Control Unit 170 POU Edit Control Unit 180 PLC Program Memory 181 POU
182 Program Worksheet 183 Local Variable Worksheet 184 Global Variable Worksheet

Claims (4)

Program editing means for editing a programmable logic controller sequence program in units of program components;
A program worksheet for defining the logic of the program component, a local variable worksheet for registering a local variable used in the program worksheet, and a global variable shared by a plurality of program component program worksheets. A program memory for storing the global variable worksheet to be registered;
Program dividing means for dividing one program component into a plurality of parts and creating the program worksheet corresponding to the divided program component and the local variable worksheet,
The program dividing means changes a local variable shared by divided program components into a global variable and adds it to the global variable worksheet, and registers it as an external reference variable in the divided local variable worksheet. Program editing device of programmable logic controller characterized by the above.   2. The program editing apparatus for a programmable logic controller according to claim 1, wherein the program dividing means notifies the program editor of duplication of the variable when adding the global variable to avoid duplication registration. Program editing means for editing a programmable logic controller sequence program in units of program components;
A program worksheet for defining the logic of the program component, a local variable worksheet for registering a local variable used in the program worksheet, and a global variable shared by a plurality of program component program worksheets. A program memory for storing the global variable worksheet to be registered;
A plurality of program components are combined into one, and the program worksheet corresponding to the combined program components and the program combining means for creating the local variable worksheet are provided,
The program combining means changes a global variable shared as an external reference variable only in the program component before combining into a local variable, registers it in the combined local variable worksheet, and deletes it from the global variable worksheet A program editing device for a programmable logic controller.   4. The program editing apparatus for a programmable logic controller according to claim 3, wherein said program combination means notifies a program editor of duplication of local variables to avoid duplication registration when creating a local variable worksheet. .

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