JP2010020635A - Programming language conversion apparatus, conversion method and conversion program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the load of, increase the reliability of and generalize the conversion of an LD program for use in a PLC, or the like, into an FBD program. <P>SOLUTION: A function block extracting part 31 extracts function blocks from LD program data (XML document) 23, to generate hierarchical structure data of the function blocks (step S402). With the hierarchical structure data of the function blocks, an LD/FBD conversion part 32 converts an LD program into an FBD program in each function block, to generate FBD parts of each function block (step S403). An FBD program generating part 33 connects the FBD parts of each function block, to generate FBD program data (XML document) 24 (step S404). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a programming language conversion device, a conversion method, and a conversion program used in a PLC (Programmable Logic Controller: Programmable Logic Controller) and the like. ) It relates to a technique for converting to an FBD program written in a language.

  Conventionally, an LD program written in an LD language is used as a program for operating a control device such as a PLC or a motion controller. This LD program shows a procedure for controlling a controlled object by a control device, and is a program described by a so-called ladder, which is a programmable language dedicated to sequence control, using a personal computer or a dedicated programming device. Designed and manufactured.

  However, the LD program is not easy because the specifications of the ladder are not uniform among the control device manufacturers, and special knowledge and experience are required for programming. Therefore, in order to ease the handling by reducing the particularity of such LD programs, for example, a mechanism that can design and produce LD programs from a WWW browser (see Patent Documents 1 and 2), a ladder In addition, various techniques have been developed, such as a mechanism for performing programming using a general-purpose language such as C language (see Patent Document 3).

  On the other hand, the FBD standard has been studied as a programming language used for a control device such as a PLC by IEC (International Electrotechnical Commission). The FBD program described by this FBD is a graphical program using graphics. In addition, FBD is generally expected to be an alternative language to ladders because it is more advantageous for structuring and modularization than ladders.

  However, in the field of control devices such as PLCs, it is common to design and manufacture LD programs using ladders that have been used to date. For this reason, in order to effectively utilize the advantages of structuring and modularization, it is necessary to transfer the LD program, which is the designed and produced program product, to the FBD program.

JP 2004-46618 A JP 2002-189508 A JP 2007-334469 A

  Conventionally, a transition from an LD program to an FBD program has been performed manually by a designer analyzing the LD program and converting it into an FBD program. For this reason, the conversion work takes a lot of time and effort. In addition, since manual operation may cause mistakes in the conversion process, conversion from the LD program to the FBD program is not always performed accurately, and there is anxiety in terms of reliability.

  Further, as described above, since the specifications of the ladder are not unified among the control device manufacturers, the conversion work from the LD program to the FBD program cannot be performed uniformly. For this reason, it has been desired that general-purpose conversion work can be performed as much as possible.

  Therefore, the present invention has been made to solve the above problems, and its purpose is to reduce the load of conversion work and improve the reliability when converting an LD program used for a PLC or the like into an FBD program, Another object of the present invention is to provide a programming language conversion device, a conversion method, and a conversion program capable of realizing versatility.

  To achieve the above object, a programming language conversion apparatus according to the present invention is expressed in a markup language in a programming language conversion apparatus that converts an LD program that realizes a predetermined sequence process by combining a plurality of variables into an FBD program. From the LD program, a functional block consisting of a ladder group having the common variables is extracted, and a lower layer functional block consisting of a ladder group having the common variables is extracted sequentially from the extracted functional blocks. A functional block extraction unit that generates hierarchical structure data, and an LD functional element that constitutes an LD program of the functional block for each functional block using the hierarchical structure data generated by the functional block extraction unit, It is placed in the FB function element that constitutes the FBD program. In addition, an LD / FBD conversion unit that generates an FBD part for each functional block and an FBD part for each functional block generated by the LD / FBD conversion unit are wired to generate an FBD program expressed in a markup language. And an FBD program generation unit.

  The programming language conversion method according to the present invention is a programming language conversion method for converting an LD program that realizes a predetermined sequence process by combining a plurality of variables into an FBD program. A first step of extracting a functional block consisting of a ladder group having the variable to be performed, and a lower-level functional block consisting of a ladder group having the variable common to each other from the functional block extracted by the first step. The second step of sequential extraction, the third step of generating hierarchical structure data by repeating the first step and the second step, and the hierarchical structure data generated by the third step. Use for each functional block, its functional block The LD function element constituting the LD program is replaced with the FB function element constituting the FBD program, and a fourth step for generating an FBD part for each functional block, and for each functional block generated by the fourth step And a fifth step of generating an FBD program expressed by a markup language by wiring between FBD parts.

  In the programming language conversion method according to the present invention, the first step selects a reference ladder among LD programs expressed in a markup language, and uses a variable of the reference ladder. The other ladder is extracted as a functional block, and the second step uses the input variable of the reference ladder as an output variable from the functional block extracted in the first step. Select the ladder as a new reference ladder, specify another ladder that uses the variable of the new reference ladder, extract the other ladder as a lower-level functional block, and It is characterized in that selection of a new ladder as a reference and extraction of functional blocks in a lower layer are performed hierarchically.

  In the programming language conversion method according to the present invention, the fourth step selects a lower-level functional block from the hierarchical structure data generated by the third step, and the function block is selected for each lower-level functional block. The LD function elements constituting the LD program are replaced with the FB function elements constituting the FBD program to generate an FB diagram, and input variables, output variables, and first-order lag variables are set from the FB diagram, and screen display is performed. A variable to be concealed is set, and an FBD part for each functional block is generated.

  Further, in the programming language conversion method according to the present invention, the fifth step is based on the set input variable, output variable, and first order lag variable between the FBD parts for each functional block generated by the fourth step. An FBD program that is wired and expressed in a markup language is generated.

  A programming language conversion program according to the present invention is a programming language conversion program that converts an LD program that realizes a predetermined sequence process by combining a plurality of variables into an FBD program, and is an LD expressed in a markup language on a computer. A process for extracting a functional block consisting of a ladder group having the same variable from the program, and a hierarchically lower functional block consisting of a ladder group having the common variable from the extracted functional block. An extraction function, a process of generating hierarchical structure data by repeating the extraction process, and an LD function that constitutes an LD program of the functional block for each functional block using the generated hierarchical structure data Elements, FBD programs Replacing the FB functional element to generate an FBD part for each functional block, and processing for generating an FBD program expressed in a markup language by wiring between the generated FBD parts for each functional block. It is made to perform.

  As described above, according to the present invention, when an LD program used for a PLC or the like is converted into an FBD program, it is possible to reduce the load of conversion work, improve reliability, and realize versatility. Become.

The best mode for carrying out the present invention will be described below with reference to the drawings.
First, an outline of the present invention will be described. The present invention is characterized by a mechanism for converting an LD program expressed in a markup language such as XML (extensible Markup Language) into an FBD program expressed in a markup language such as XML.

  FIG. 1 is a diagram for explaining a series of flows for conversion processing from a conversion source LD program to a conversion destination FBD program. In FIG. 1, an XML document is interposed in a series of flows for converting a conversion source LD program into a conversion destination FBD program. That is, according to the embodiment of the present invention, a process of interposing an XML document in a series of conversion operations, that is, a process of converting an LD program expressed in XML into an FBD program expressed in XML (conversion process S2). There is a feature.

  The conversion source LD program is a program generated in accordance with the specification of the LD language provided uniquely by the control device manufacturer. Since this conversion source LD program is not generated under uniform specifications, the conversion source LD program differs depending on the control device manufacturer.

  The LD program expressed in XML is a program obtained by converting the conversion source LD program by a predetermined conversion process S1. Here, since the conversion source LD program is different depending on the manufacturer of the control device, the conversion process S1 is also different depending on the type of the conversion source LD program. However, unlike the conversion source LD program and the conversion process S1, the LD program expressed in XML is a unified and uniform expression form program. For example, an LD program α expressed in XML is a program converted from a conversion source LD program according to specifications of a certain control device manufacturer, and an LD program β expressed in XML is a conversion source LD program according to specifications of another control device manufacturer. Suppose the program is converted from. In this case, when both conversion source LD programs realize the same operation and only the expression form is different, the LD program α expressed in XML and the LD program β expressed in XML have the same expression form. The same program.

  The FBD program expressed in XML is a program obtained by converting the LD program expressed in XML by the conversion process S2 according to the embodiment of the present invention. Here, since the LD program expressed in XML is a unified and uniform expression form program, the FBD program expressed in XML is also a unified and uniform expression form program.

  The conversion destination FBD program is a program obtained by converting an FBD program expressed in XML by a predetermined conversion process S3. Here, the conversion destination FBD program is an FBD program generated according to the FBD language uniquely provided by the control device manufacturer. Therefore, since this conversion destination FBD program is not generated under uniform specifications, it becomes a program that differs depending on the control device manufacturer, and the conversion process S3 also differs depending on the type of the conversion destination FBD program.

  As described above, in the embodiment of the present invention, an XML document is interposed in a series of flows for converting a conversion source LD program that differs depending on the control device manufacturer into a conversion destination FBD program that is different depending on the control device meter. Specifically, the conversion source LD program is converted into an LD program having an expression form according to a common specification (conversion process S1), and then converted into an FBD program having an expression form according to a common specification (conversion process S2). Conversion into the previous FBD program is performed (conversion processing S3). Since this conversion process S2 can be defined as a uniform process that does not differ between control device manufacturers, it can be used universally in the overall flow.

[Configuration of PLC programming language converter]
Next, the configuration of the PLC programming language conversion device according to the embodiment of the present invention will be described. FIG. 2 is a block diagram showing a hardware configuration of a PLC programming language conversion device according to an embodiment of the present invention, and FIG. 3 is a block diagram showing a functional configuration of the PLC programming language conversion device shown in FIG. The PLC programming language conversion device 1 is a device that converts an LD program expressed in XML into an FBD program expressed in XML. Note that the LD program expressed in XML is preliminarily converted from the conversion source LD program by the conversion processing S1 shown in FIG.

  Referring to FIG. 2, the PLC programming language conversion device 1 is a personal computer, for example, and includes a CPU 10, a RAM 11, a ROM 12, an HD (hard disk) 13, a communication interface 14, a display interface 15, and an operation interface 16. The CPU 10 includes a RAM 11 and a ROM 12 to form a control unit 30, and the entire PLC programming language conversion device 1 is controlled by the control unit 30. The RAM 11 is a rewritable storage unit that temporarily stores various programs, data, and the like. The ROM 12 is a storage unit that stores programs and data for executing basic processing by the CPU 10 in advance. is there.

  The communication interface 14 communicates with other computers or servers via a communication network such as the Internet (not shown). The display interface 15 receives screen display data from the control unit 30 and outputs, for example, an LD program expressed in XML, an FBD program expressed in XML, and the like to the display device 2. The operation interface 16 outputs operation data to the control unit 30 according to the operation of the keyboard 3 and the mouse 4 by the operator.

  The HD 13 is a storage unit that stores an OS (Operating System) 20, a screen control program 21, a language conversion program 22, an LD program data (XML document) 23, an FBD program data (XML document) 24, and the like. Here, the LD program data (XML document) 23 is an LD program expressed in XML, and the FBD program data (XML document) 24 is an FBD program expressed in XML.

  The OS 20 is a program that provides basic functions for causing the PLC programming language conversion device 1 to operate as a computer. The screen control program 21 displays the LD program expressed in XML and the FBD program expressed in XML on the display device 2, or displays necessary data on the display device 2 according to the operation of the keyboard 3 and the mouse 4 by the operator. For example, the program controls the display interface 15 that displays data on the screen of the display device 2.

  The language conversion program 22 is a program that reads the LD program data (XML document) 23 stored in the HD 13, performs language conversion processing to be described later, generates FBD program data (XML document) 24, and stores it in the HD 13.

  The OS 20 is read and executed by the CPU 10, so that the basic functions of the computer are functions related to memory management of the RAM 11, ROM 12 and HD 13, functions related to communication control of the communication interface 14, and display of the display interface 15. Functions related to control, functions related to operation input control of the operation interface 16, and the like are realized. Then, the language conversion program 22 and the like are executed in a state where the OS 20 is executed by the CPU 10.

  The OS 20, the screen control program 21, the language conversion program 22 and the like may be downloaded to the HD 13 via a network cable from a server or the like connected to a communication network (not shown), or a CD-ROM. Or the like, and then read into the HD 13 via the storage medium.

  As described above, the control unit 30 includes the CPU 10, the RAM 11, and the ROM 12, and the CPU 10 reads out the language conversion program 22 stored in the HD 13 to the RAM 11 and executes the language conversion program 22, thereby having a functional configuration as shown in FIG.

  That is, when the control unit 30 shown in FIG. 2 executes the language conversion program 22, the PLC programming language conversion device 1 has a function block extraction unit 31, an LD / FBD conversion unit 32, and an FBD as shown in FIG. The program generation unit 33 is provided.

[Processing of PLC programming language converter]
Next, processing of the PLC programming language conversion device 1 shown in FIGS. 2 and 3 will be described. FIG. 4 is a flowchart showing an overall flow of the language conversion processing by the PLC programming language conversion device 1.

  First, the functional block extraction unit 31 of the PLC programming language conversion device 1 reads the LD program data (XML document) 23 from the HD 13 (step S401), extracts the functional block from the LD program data (XML document) 23, and outputs the functional block. Is generated (step S402).

  The LD / FBD conversion unit 32 inputs the hierarchical structure data by the functional block generated by the functional block extraction unit 31, converts the LD program into an FBD program for each functional block, and generates an FBD component for each functional block. (Step S403).

  The FBD program generation unit 33 inputs FBD parts for each functional block generated by the LD / FBD conversion unit 32, connects the FBD parts for each functional block, and generates FBD program data (XML document) 24. (Step S404). Then, the FBD program generation unit 33 stores the FBD program data (XML document) 24 in the HD 13 (step S405). Thereby, the language conversion process ends.

[Function block and hierarchical structure generation processing]
Next, the functional blockization and hierarchical structure generation processing in step S402 shown in FIG. 4 will be described in detail. FIG. 5 is a flowchart showing functional blockization and hierarchical structure generation processing. The functional block extraction unit 31 extracts functional blocks from the LD program data (XML document) 23 by the processing shown in FIG. 5, and generates hierarchical structure data.

  FIG. 6 is a diagram representing a part of the LD program data (XML document) 23 read from the HD 13 in the form of a ladder, and shows the original LD program. This LD program expresses LD program data (XML document) 23 in a ladder form for the sake of simplicity. The same applies to FIG. 7, FIG. 8, FIG. 11 and FIG. In FIG. 6, reference numerals 100 to 160 on the left end indicate ladder numbers of ladders in one line among a plurality of ladders constituting the LD program data (XML document) 23. a4, b1, b2, b, etc. indicate the input / output addresses of each element, and each symbol indicates the type of element (a contact, b contact, coil, etc.). Hereinafter, in order to simplify the description, a4, b1, b2, b, etc. are treated as variables reflecting the input / output state. For example, a4, b1, and b2 are input variables, and b is an output variable. Hereinafter, description will be given with reference to an example of the LD program data (XML document) 23 shown in FIG.

  First, the functional block extraction unit 31 determines whether or not there is only one reference ladder for the LD program data (XML document) 23 read from the HD 13 (step S501). When it is determined that there is only one reference ladder (step S501: Y), the process proceeds to step S507. On the other hand, when it is determined that there are two or more reference ladders (step S501: N), the lowest ladder (the line with the highest ladder number) is identified as the reference ladder (step S502). ). In the example of FIG. 6, the functional block extraction unit 31 determines that there are two or more reference ladders for the LD program data (XML document) 23 (step S501: N), and the ladder number 160 located at the lowest position. Is specified as a reference ladder (step S502). Hereinafter, the ladder with ladder number n is referred to as ladder n.

  The functional block extraction unit 31 extracts the functional block (1) from the ladder constituting the LD program data (XML document) 23 based on the reference ladder 160 (step S503). Specifically, the functional block extraction unit 31 identifies a ladder that uses the variables of the reference ladder 160, aligns the identified ladder in the order of the ladder numbers, and sets the sorted ladder group as a functional block. Extract as (1).

  FIG. 7 is a diagram for explaining the function block (1) extraction process. The functional block extraction unit 31 identifies the variables a4, a3, a2, a1, a of the reference ladder 160. First, a ladder that uses the variable a as a variable of interest for the variable a is changed from the ladder 150 to the ladder. In order to 100, it is determined and determined for each ladder. The same processing is performed for the variables a1, a2, a3, and a4, and the ladder that uses the variable is specified. In the case of the LD program data (XML document) 23 shown in FIG. 6, ladders 100, 110, 120, 130, and 140 are specified as shown in FIG. 7, and these ladder groups are function blocks (1), ie, function blocks. Extracted as block A. The ladder 150 is not included in the ladder of the functional block (1), that is, the functional block A because the variables a4, a3, a2, a1, and a of the reference ladder 160 are not used. Moved to. That is, the functional block extraction unit 31 extracts a functional block A including the ladders 100, 110, 120, 130, 140, and 160 in step S503. Note that the ladder 150 becomes a functional block B by the next processing in step S503.

  Returning to FIG. 5, the functional block extraction unit 31 determines whether or not there is only one line of a reference ladder in the extracted functional block (1) (step S504). When it is determined that there is only one reference ladder (step S504: Y), the process proceeds to step S501. On the other hand, when it is determined that there are two or more reference ladders (step S504: N), a new reference ladder (row) is specified in the extracted functional block (1) (step S505). . Then, the functional block extraction unit 31 newly extracts the functional block (2) based on the reference ladder (step S506).

  FIG. 8 is a diagram for explaining the function block (2) extraction process. The function block extraction unit 31 specifies the ladder that uses the variable a1 as an output variable as the variable of interest, using the input variable a1 of the ladder 160 that is the reference in step S502. In other words, the ladder that calculates the variable a of interest is specified, and the ladder is newly specified as a reference ladder. Then, the functional block extraction unit 31 performs the same processing as the processing in step S503 in the functional block A, and extracts the functional block (2). That is, in the example of FIG. 8, in step S506, the functional block extraction unit 31 converts the ladder 160 into the functional block A1 and the ladders 120, 130, and 140 into the functional block A2.

  In step S506, the functional block extraction unit 31 extracts the functional blocks A1 and A2, and then proceeds to step S504. Similarly, extraction of the function block (2) is repeated in the function block (1). In the example of FIG. 8, functional blocks A1, A2, A3, and A4 are extracted as the functional block (2). Here, when the functional block extraction unit 31 determines in step S504 that only one reference ladder exists in the functional block (1) (step S504: Y), the functional block extraction unit 31 converts the ladder into the functional block (2 ) And the process proceeds to step S501.

  In the flowchart shown in FIG. 5, the process of extracting the function block (1) and the function block (2) is shown, but the function block (3) is further extracted from the function block (2). Is done. That is, functional blocks are extracted hierarchically.

  If the functional block extraction unit 31 determines in step S501 that there is only one reference ladder (step S501: Y), the functional block extraction unit 31 extracts the ladder as a functional block (1), and proceeds to step S507. The functional block extraction unit 31 generates a hierarchical structure from the functional blocks (1), (2), and the like obtained by the processing in steps S501 to S506 (step S507). Thereby, the functional blockization and the hierarchical structure generation process are completed.

  FIG. 9 is a diagram for explaining the hierarchical structure. The hierarchical structure shown in FIG. 9 is generated by the functional block extraction unit 31 in step S507. In the hierarchical structure of the functional blocks shown in FIG. 9, LD program data (XML document) 23, which is an original LD program, is divided into functional blocks A, B, etc., which are ladders using common variables. The function block A is divided into function blocks A1, A2, A3, and A4 that are ladders using common variables.

  Here, the functional blocks A, B, etc. are located at level 1 corresponding to the functional block (1), and the functional blocks A1, A2, A3, A4 are located at level 2 corresponding to the functional block (2). is doing. Similarly, when the functional block (3) exists, as shown by the dotted line, the functional block A2 is distinguished into functional blocks A2-1 and A2-2 composed of ladders using common variables. Has been.

  In the hierarchical structure shown in FIG. 9, the LD program in which the lowermost functional blocks are arranged in order from the top, the ladder constituting the LD program data (XML document) 23, which is the original LD program, is displayed for each functional block. This is an LD program that has been rearranged. In other words, this is an LD program in which ladders whose functions are closely related are collectively recombined as function blocks. However, each variable in the ladder is not rearranged.

  As described above, the functional block extraction unit 31 extracts a functional block in which a common variable is used from the LD program data (XML document) 23 read from the HD 13, and the common variable among the extracted functional blocks is extracted. By further extracting the functional blocks in which is used and repeating this process, a hierarchical structure of functional blocks is generated.

[FBD parts generation processing]
Next, the FBD component generation process in step S403 shown in FIG. 4 will be described in detail. FIG. 10 is a flowchart showing the FBD component generation process. The LD / FBD conversion unit 32 converts the LD program into the FBD program for each functional block with respect to the hierarchical structure data by the functional block by the processing shown in FIG.

  First, the LD / FBD conversion unit 32 determines whether or not there is an unprocessed functional block for which no FBD component has been generated (step S1001). Since all the functional blocks are unprocessed at first, it is determined that there are unprocessed functional blocks. If the LD / FBD conversion unit 32 determines that there is no unprocessed functional block after repeating the processing from step S1002 to step S1008 described later (step S1001: N), the FBD component generation processing ends.

  When the LD / FBD conversion unit 32 determines that there is an unprocessed functional block (step S1001: Y), the LD / FBD conversion unit 32 arbitrarily selects one unprocessed functional block from the lower-level functional blocks in the hierarchical structure of the LD program. Select (step S1002). For example, as shown in FIG. 9, the LD / FBD conversion unit 32 selects one functional block from among the functional blocks at the lower level with the original LD program as a base point. First, the LD / FBD conversion unit 32 determines the level 1 functional block A and the functional block B that are nested in the original LD program. Then, for the functional block A, the level 2 functional blocks A1 to A4 that are nested in the functional block A are determined, and for the functional block A2, the nested functional blocks A2-1 and A2-2 are determined. . Then, the lowest functional block is determined for each branch in order from the top. That is, since there is no level 3 nesting in the level 2 functional block A1, the lowest level functional block is the functional block A1. Further, since the level 3 function block A2 has a level 3 nesting and the level 3 function blocks A2-1 and A2-2 have no level 4 nesting, the lowest level function block is a function block. A2-1 and A2-2. In this way, the functional blocks A1, A2-1, A2-2, A3, A4,... Are determined as the lowermost functional blocks. Here, when one unprocessed functional block is selected from the level 2 functional blocks, the LD / FBD conversion unit 32 determines the functional block A2 whose level 2 functional block is not the lowest layer. The nested functional blocks A2-1 and A2-2 are replaced with the functional block A2. Then, the LD / FBD converter 32 selects one functional block from the functional blocks A1, A2, A3, A4 and the like. Although an example in which one unprocessed functional block is selected from the functional blocks at level 2 is shown here, the present invention is not limited to level 2, and the number of hierarchical functional blocks and The level may be determined according to the number of branches or the like. Moreover, although the example which selects one unprocessed functional block from the same level was shown, it does not necessarily need to be the same level and you may make it select a functional block of a different level.

  The LD / FBD conversion unit 32 replaces the LD functional element included in the functional block with the FB functional element for the functional block selected in step S1002 (step S1003). As a result, the functional block of the LD program is replaced with the FB diagram of the FBD program.

  FIG. 11 is a diagram for explaining the process of replacing the LD function element with the FB function element. FIG. 12 is a diagram for explaining the process of replacing the functional block A2 of the LD program with the FB diagram A2 of the FBD program. The FB diagram A2 shown in FIG. 12 expresses the FBD program data (XML document) for convenience in the form of an FBD for the sake of simplicity. As shown in FIG. 11, for example, the LD function elements of coils and relays are replaced with FB function elements with two inputs and one output. In FIG. 12, when an AND operation is performed between the α contact of the input variable a114 of the ladder 120 included in the functional block A2 and the a contact of the input variable a113, the LD functional elements of the input variables a114 and a113 in the functional block A2 are , FB function elements as shown in FIG. A2 (elements in which 2-input AND operation is performed with input variables a114 and a113, and the operation result is an output variable of 1 output) are replaced. In this way, by replacing all of the LD functional elements included in the ladder 120, 130, 140 constituting the functional block A2 with the FB functional elements, the functional block A2 of the LD program is placed in the FB diagram A2 of the FBD program. Be replaced.

  The LD / FBD conversion unit 32 sets an input variable for the FB diagram replaced from the functional block in step S1003 (step S1004). In the example of FIG. 12, a114, a113, a112, a12, and a13 are set as input variables. The input variable set here is input information for the entire FB diagram, and is input information for the FBD component. The input variable set in this way is used as reference information for connecting to the output variable when wiring the FBD component in the FBD wiring process described later.

  The LD / FBD conversion unit 32 sets an output variable for the FB diagram replaced from the functional block in step S1003 (step S1005). In the example of FIG. 12, a11, a111, and a1 are set as output variables. The output variable set here is output information of the entire FB diagram, and is output information of the FBD component. The output variable set in this way is used as reference information for connecting to the input variable when wiring the FBD component in the FBD wiring process described later.

  The LD / FBD conversion unit 32 sets a first-order lag variable according to the operation input of the operator for the FB diagram replaced from the functional block in step S1003 (step S1006). The primary delay variable is an input variable that is referred to before the variable value is determined by the output variable. Specifically, in the LD program, a first ladder that includes an input variable that is a first-order lag variable and a second ladder that includes an output variable that reflects the input variable that is the first-order lag variable exist in this order. In this case, the input value of the former ladder reflects the variable value of the output variable of the latter ladder in the next scan. Therefore, the input variable of the former ladder is a primary delay variable because the variable value is reflected with a delay of one scan.

  The operator determines the first-order lag variable while referring to the LD program, and the LD / FBD conversion unit 32 sets the first-order lag variable by operating the variable. Note that the LD / FBD converter 32 may automatically select and set the first-order lag variable using the LD program in consideration of the order of the input / output variables. The first-order delay variable set in this way is used as reference information for connecting to the output variable when wiring the FBD component in the FBD wiring process described later.

  The LD / FBD conversion unit 32 conceals preset input / output variables by the operator's operation input for the FB diagram replaced from the functional block in step S1003 (step S1007). Here, concealment means that the variable is not displayed when the generated FBD component is displayed on the screen. The operator sets only variables existing in one function block as input / output variables to be hidden, and does not set variables related to each other among a plurality of function blocks. The LD / FBD conversion unit 32 determines whether the variable exists in one functional block or is a variable related to each other among a plurality of functional blocks, and automatically sets the input / output variable to be concealed. It may be set and hidden.

  By performing the processing in steps S1001 to S1007 described above, an FBD part corresponding to the functional block selected in step S1001 is completed (step S1008). Then, the process proceeds to step S1001, and when the LD / FBD conversion unit 32 completes the FBD parts corresponding to all the lower-layer functional blocks, the FBD part generation process ends.

  As described above, the LD / FBD conversion unit 32 converts the LD function element into the FB function element for each of the lower-level function blocks with respect to the hierarchical structure data generated by the function block extraction unit 31, and the input variable and the output variable. Then, by setting a first-order lag variable and further setting an input / output variable to be concealed, an FBD component corresponding to the functional block is generated. Thereby, FBD parts corresponding to all lower-layer functional blocks can be completed. Since the input variable, the output variable, and the first-order lag variable are set, the FBD parts can be wired by referring to these variables in the FBD wiring process described later. Since the input / output variables to be concealed are set, when the FBD program is displayed on the screen, the concealed variables are not displayed and the program is easy to see as a whole.

[FBD wiring processing]
Next, the FBD wiring process in step S404 shown in FIG. 4 will be described in detail. FIG. 13 is a flowchart showing the FBD wiring process. The FBD program generation unit 33 generates FBD program data (XML document) 24 by wiring FBD parts for each functional block by the processing shown in FIG.

  First, the FBD program generation unit 33 inputs the FBD part for each functional block generated by the LD / FBD conversion unit 32, and determines whether there is an unwired FBD part (step S1301). Since all the FBD parts are unwired at first, it is determined that there is an unwired FBD part. If the FBD program generation unit 33 repeats the processing from step S1302 to step S1310, which will be described later, and determines that there is no unwired FBD part (step S1301: N), the FBD wiring processing ends.

  When the FBD program generation unit 33 determines that there is an unwired FBD part (step S1301: Y), the FBD program generation unit 33 arbitrarily identifies one FBD part from the unwired FBD parts, and performs the processing illustrated in FIG. Based on the hierarchical structure data obtained in this way, the group of the FBD parts is selected (step S1302). Here, the group refers to a set of lower-level FBD parts in the case where the same functional block is provided at the upper level in the hierarchical structure of functional blocks. For example, in FIG. 9, the set of FBD parts corresponding to the functional blocks A1, A2, A3, and A4 belongs to the group of functional blocks A. That is, in the example of FIG. 9, the FBD program generation unit 33 selects a group of level 1 functional blocks A when the identified FBD component is an FBD component corresponding to the functional block A1.

  The FBD program generation unit 33 selects a central FBD component (central FBD component) from the group of FBD components belonging to the group selected in step S1302 (step S1303). Specifically, the FBD program generation unit 33 associates each FBD part of the FBD part group based on the input / output variable, and the number of connection lines when the input variable and the output variable are connected by the connection line. Count. Then, the FBD component having the largest number of connection lines among the number of connection lines for each FBD component is selected as the central FBD component.

  The FBD program generation unit 33 arranges the central FBD part selected in step S1303 in the center of the drawing when the screen on which the FBD program of the group is displayed is a drawing (step S1304). For example, the coordinate data of the center of the drawing is set as the arrangement position data in the drawing of the central FBD part.

  The FBD program generation unit 33 determines whether or not there is an unselected FBD part for the FBD parts belonging to the group (step S1305). Initially, since all FBD parts are not selected, it is determined that there is an unselected FBD part. If the FBD program generation unit 33 determines that there is no unselected FBD part after repeating the processing from step S1307 to step S1310 described later (step S1305: N), it is assumed that the wiring in the group has been completed. (Step S1306), the process proceeds to Step S1301.

  If it is determined that there is an unselected FBD part (step S1305: Y), the FBD program generation unit 33 arbitrarily selects one FBD part from the unselected FBD parts (step S1307).

  If the FBD part selected in step S1307 has a first-order lag variable, the FBD program generation unit 33 specifies the FBD part that determines the first-order lag variable, and places the specified FBD part on the right side of the selected FBD part. Then, the first-order lag variable and the output variable of the identified FBD part are wired (step S1308).

  The FBD program generation unit 33 identifies the FBD component that determines the input variable for the input variable of the FBD component selected in step S1307, places the identified FBD component on the left side of the selected FBD component, and sets the input variable. And the output variable of the identified FBD part are wired (step S1309).

  The FBD program generation unit 33 identifies the FBD part that refers to the output variable for the output variable of the FBD part selected in step S1307, places the identified FBD part on the right side of the selected FBD part, and outputs the output variable. And the input variable of the specified FBD part are wired (step S1310). Then, control goes to a step S1305.

  In this way, by repeating the processing from step S1307 to step S1310, wiring of all the FBD parts belonging to the group is performed, and the group FBD program is generated around the center FBD part arranged at the center of the drawing. Is done. Then, the process proceeds to step S1301, the same process is performed for the other groups, and the FBD wiring process ends.

  As described above, according to the PLC programming language conversion device 1 according to the embodiment of the present invention, the functional block extraction unit 31 extracts a functional block from the LD program data (XML document) 23 to generate hierarchical structure data, The LD / FBD conversion unit 32 converts the LD program into an FBD program for each functional block in the hierarchical structure data, generates an FBD component for each functional block, and the FBD program generation unit 33 performs an FBD component for each functional block. The FBD program data (XML document) 24 is generated by wiring. As a result, it is possible to eliminate the time and labor problems caused by the conventional manual work, and it is possible to eliminate errors associated with the conversion work. Therefore, it is possible to reduce the load of conversion work from the LD program to the FBD program, and to improve the reliability of the conversion work.

  Also, according to the PLC programming language conversion device 1 according to the embodiment of the present invention, the conversion source LD program is unified in order to convert from the conversion source LD program that is not unified among the control device manufacturers to the conversion destination FBD program. The LD program data (XML document) 23 is converted in advance, and the LD program data (XML document) 23 is converted into LD program data (XML document) 23. Then, the LD program data (XML document) 23 is converted into a conversion destination FBD program. Therefore, even if a conversion source LD program that is not unified among control device manufacturers is converted into LD program data (XML document) 23 according to specifications unified among control device manufacturers, LD program data (XML document) 23 to FBD program data (XML document) 24 can be uniformly converted. That is, a conversion method that can be used universally and can be incorporated among the control device manufacturers can be incorporated into the conversion process from the conversion source LD program to the conversion destination FBD program. Thereby, the conversion from the LD program to the FBD program can be realized for general purposes.

  The present invention has been described with reference to the embodiment. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical idea thereof. For example, the LD program and the like shown in FIGS. 6, 7, 8, and 12 and the hierarchical structure shown in FIG. 9 are merely examples for explaining the embodiment of the present invention, and the present invention is not limited thereto. There is no limit.

  In the above embodiment, the XML document has been described as an example. However, the present invention is not limited to this, and HTML (Hyper Text Markup Language), SGML (Standard Generalized Markup Language), and RTF (Rich Text Format). Any document in a markup language such as TeX may be used.

It is a figure explaining a series of flows about the conversion process from the LD program of a conversion source to the FBD program of a conversion destination. It is a block diagram which shows the hardware constitutions of the PLC programming language converter by embodiment of this invention. It is a block diagram which shows the function structure of the PLC programming language converter by embodiment of this invention. It is a flowchart which shows the whole flow of a language conversion process. It is a flowchart which shows a function block formation and hierarchical structure production | generation process. It is a figure expressing LD program (original). It is a figure explaining the extraction process of a functional block (1). It is a figure explaining the extraction process of a functional block (2). It is a figure explaining the hierarchical structure by a functional block. It is a flowchart which shows a FBD component production | generation process. It is a figure explaining the process which replaces LD function element with FB function element. It is a figure explaining the process which replaces the functional block of LD program with the FB figure of an FBD program. It is a flowchart figure which shows FBD wiring processing.

Explanation of symbols

1 PLC programming language conversion device 2 Display device 3 Keyboard 4 Mouse 10 CPU
11 RAM
12 ROM
13 HD
14 Communication interface 15 Display interface 16 Operation interface 20 OS
21 Screen control program 22 Language conversion program 23 LD program data (XML document)
24 FBD program data (XML document)
30 Control Unit 31 Functional Block Extraction Unit 32 LD / FBD Conversion Unit 33 FBD Program Generation Unit

Claims (6)

In a programming language conversion device that converts an LD (Ladder Diagram) program that realizes a predetermined sequence process by combining a plurality of variables into an FBD (Function Block Diagram) program,
A functional block consisting of a ladder group having the common variable is extracted from the LD program expressed in a markup language, and a lower functional block consisting of a ladder group having the common variable is extracted from the extracted functional block. Functional block extraction unit that sequentially extracts the hierarchically and generates hierarchical structure data,
Using the hierarchical structure data generated by the functional block extraction unit, for each functional block, the LD functional element constituting the LD program of the functional block is replaced with the FB functional element constituting the FBD program, and the function An LD / FBD converter that generates FBD parts for each block;
An FBD program generation unit for wiring FBD parts for each functional block generated by the LD / FBD conversion unit and generating an FBD program expressed in a markup language;
A programming language conversion device characterized by comprising: In a programming language conversion method for converting an LD program that realizes a predetermined sequence process by combining a plurality of variables into an FBD program,
A first step of extracting a functional block consisting of a ladder group having the variables in common from an LD program expressed in a markup language;
A second step of hierarchically extracting the lower-layer functional blocks consisting of ladder groups having the variables that are common to each other from the functional blocks extracted in the first step;
A third step of generating hierarchical structure data by repeating the first step and the second step;
Using the hierarchical structure data generated in the third step, for each functional block, the LD functional element constituting the LD program of the functional block is replaced with the FB functional element constituting the FBD program, and the functional block A fourth step of generating each FBD part;
A fifth step of wiring between FBD parts for each functional block generated in the fourth step and generating an FBD program expressed in a markup language;
A programming language conversion method characterized by comprising: The programming language conversion method according to claim 2, wherein
The first step selects a reference ladder among LD programs expressed in a markup language, specifies another ladder that uses a variable of the reference ladder, and selects the other ladder. Extract as a functional block,
In the second step, a ladder that uses an input variable of the reference ladder as an output variable is newly selected as a reference ladder from the functional blocks extracted in the first step, and the new ladder is selected. The other ladders that use the variables of the reference ladder are identified, the other ladders are extracted as lower-level functional blocks, and the selection of the new reference ladder and the extraction of the lower-level functional blocks are hierarchical. To do,
A programming language conversion method characterized by the above. In the programming language conversion method according to claim 2 or 3,
In the fourth step, a lower-layer functional block is selected from the hierarchical structure data generated in the third step, and an LD functional element constituting an LD program of the functional block is selected for each lower-layer functional block. An FB diagram is generated by replacing the FB function elements constituting the FBD program, and input variables, output variables, and first-order lag variables are set from the FB diagram, and variables for hiding the screen display are set. Generate FBD parts,
A programming language conversion method characterized by the above. The programming language conversion method according to claim 4,
In the fifth step, the FBD program is configured such that the FBD parts for each functional block generated in the fourth step are wired based on the set input variable, output variable, and first-order lag variable, and expressed in a markup language. Generate
A programming language conversion method characterized by the above. A programming language conversion program for converting an LD program that realizes a predetermined sequence process by combining a plurality of variables into an FBD program,
A process of extracting a functional block consisting of a ladder group having the variables in common from an LD program expressed in a markup language;
A process of sequentially extracting hierarchically functional blocks consisting of ladder groups having the variables that are common to each other from the extracted functional blocks;
Processing for generating hierarchical structure data by repeating the extracting process;
Using the generated hierarchical structure data, for each functional block, the LD functional element constituting the LD program of the functional block is replaced with the FB functional element constituting the FBD program, and the FBD part for each functional block is Process to generate,
Wiring between the generated FBD parts for each functional block and generating an FBD program expressed in a markup language;
Programming language conversion program that runs

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