WO2013005350A1 - シンボルテーブル生成方法、周辺機器との通信方法およびプログラマブルロジックコントローラ - Google Patents
シンボルテーブル生成方法、周辺機器との通信方法およびプログラマブルロジックコントローラ Download PDFInfo
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- WO2013005350A1 WO2013005350A1 PCT/JP2011/076579 JP2011076579W WO2013005350A1 WO 2013005350 A1 WO2013005350 A1 WO 2013005350A1 JP 2011076579 W JP2011076579 W JP 2011076579W WO 2013005350 A1 WO2013005350 A1 WO 2013005350A1
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- programmable logic
- symbol table
- logic controller
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/23—Pc programming
- G05B2219/23334—Use of table with addresses for different modules, write new table if modified
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/40—Transformation of program code
- G06F8/41—Compilation
Definitions
- the present invention relates to a symbol table generation method for a program executed by a programmable logic controller in an industrial automation (automated) environment, a communication method with a peripheral device using the programmable logic controller, and a programmable logic controller.
- the low-level automation system may include a dedicated robotic device or automation system that is controlled or monitored by a programmable logic controller (PLC: Programmable logic controller).
- PLC programmable logic controller
- sensing devices and instruments may be used to monitor such processes, such as machine vision systems, bar code readers, temperature sensors, and the like.
- FIG. 1 shows a conventional industrial automation environment / production system 100.
- the peripheral device 101 is connected to the PLC 102 via the network 103.
- the PLC 102 executes a ladder program that controls various devices.
- the administrator can access the execution state and the results of various devices by making an inquiry (query) to the PLC 102 via the peripheral device 101.
- peripheral devices include a SCADA (supervision control and data acquisition) system, a human machine interface (HMI) system, and a user application activated on a computer.
- the PLC is connected to a power supply module and a network module that transmits PLC information to peripheral devices.
- device includes a physical device attached to a PLC and controlled by the PLC. Sensors, switches, relays, etc. are examples of devices described in this disclosure. However, the “device” according to the present disclosure is not limited to a physical apparatus.
- a device may refer to an internal element such as a register or an internal relay that is assigned a memory address in the PLC.
- a device may also refer to software that can communicate with a PLC via a shared access memory.
- the inquiry indicates the device in the controller that the peripheral device wants to monitor. For example, the inquiry is “Is device X on or off?”.
- controller executes a high-level language program that does not recognize the device, such an inquiry may not be recognized by the controller.
- a controller that executes a high-level language program (for example, a program written in C language) recognizes a variable name and a physical address in the controller's memory for the variable name instead of a device name.
- the existing peripheral device cannot communicate with the controller.
- the high-level language program is easy to use and maintain and the programmer prefers the high-level language program over the ladder program, the customer desires to use a new controller that can execute the high-level language program. As a possible solution to such a problem, although not sufficient, it is conceivable to use expensive middleware between the controller and peripheral devices.
- the embodiment of the present invention addresses at least the above problems and disadvantages and other disadvantages not described above. It should be noted that the present invention is not required to overcome the above disadvantages, and embodiments of the present invention may not overcome any of the above problems.
- An example of a method for generating a symbol table of a programmable logic controller that executes a high-level language program comprises the steps of reading a high-level language program, an association table that defines the relationship between devices controlled by the programmable logic controller and variable names in the high-level language program, and the physical of each variable name. Compiling and linking the high-level language program and the association table to determine the address and the corresponding device, and defining the physical address determined for each device by the compiling and linking. Generating a symbol table; and storing the symbol table in a memory of the programmable logic controller.
- an example of a method of communication between a peripheral device and a programmable logic controller that executes a high-level language program includes a step of receiving a request to read or write to a device controlled by the programmable logic controller from the peripheral device, and reading a symbol table to determine a physical address of the device in the memory of the programmable logic controller. And a step of reading or writing the determined physical address.
- the symbol table generation method, the communication method with the peripheral device, and the programmable logic controller according to the present invention have an effect that the programmable logic controller that can execute the high-level language program can easily communicate with the existing peripheral device.
- FIG. 1 is a diagram illustrating a conventional industrial automation environment / production system.
- FIG. 2 is a diagram showing a program configuration in physical memory after compiling and compiling and linking three different programs according to the conventional method.
- FIG. 3 is a diagram showing a program configuration in the physical memory after compiling and compiling and linking three different programs according to the embodiment.
- FIG. 4 is a diagram illustrating a symbol table and a memory configuration of the controller according to the embodiment.
- FIG. 5 is a diagram illustrating an example of a method for generating a symbol table.
- FIG. 6 is a diagram illustrating an example of a method corresponding to a data read / write request from the peripheral device to the controller.
- FIG. 7 is a diagram illustrating an example of a method corresponding to a data read / write request from the peripheral device to the controller.
- FIG. 8 is a diagram illustrating an example of the configuration of the controller.
- the embodiment disclosed in the present application solves the problems described in the background art by providing a related table in which each device is mapped by a corresponding variable name.
- each device is mapped by a corresponding variable name.
- it is necessary to understand the compilation process of the high-level application program.
- the compiling section compiles high-level language programs (also called “high-level programs”) into object modules. That is, the compiling unit converts the high-level program source code into assembly code understood by basic hardware (for example, a pipeline processor).
- the link unit assigns a physical address to each object file and each variable declared in the high-level program. Further, the link unit generates a symbol table in which each variable is mapped to each physical address in the memory of the controller (PLC is referred to as a controller here).
- FIG. 2 shows the compilation of three different programs and the program structure in physical memory after compilation and linking. As can be seen from FIG. 2, the link unit generates a symbol table 201 for mapping each variable to each physical address in the controller memory.
- the related table 301 is given when compiling.
- This association table 301 is given by a developer or an engineer who develops a high-level program.
- the compiling and linking processes are described in FIG. 3, but the difference between the prior art and the embodiment is that the related table 301 exists during compiling.
- the symbol table 302 is generated as a result of compiling and linking processing. As can be seen from FIG. 3, the symbol table 302 includes correspondences between device names, variables (declared by high-level programs), and physical addresses in the memory.
- the symbol table 302 has columns 311, 312, 313, 314, 315, and 316.
- a column 311 describes a device name (device memory name)
- a column 312 describes a device number (device #)
- a column 313 describes a data type or a data unit
- a column 314 describes an information amount of the data type of the column 313
- Column 315 describes the variable name associated with the device.
- the device D200 (which describes the temperature measured by the temperature sensor of the controller) is represented as a variable “Temperature_in_system” in the high level program.
- the physical address (# Address3) is assigned to the variable “Temperature_in_system” in the controller memory as seen in the column 316 describing the physical address in the new controller.
- Fig. 4 shows the memory structure of the controller after compiling and linking. As shown in FIG. 4, the symbol table 302 is stored in the memory of the controller.
- FIG. 5 shows a method of creating a symbol table that stores the correspondence between device names, variable names, and physical addresses.
- the high-level program and the related table (for example, 301) are read by the compiling unit.
- the compiling unit generates an assembly language file for each high-level program and related tables.
- the link unit assigns a physical address to each variable declared in the high-level program, and creates the symbol table 302 by reading the related table and the compiled high-level program.
- the compiling unit stores the generated symbol table 302 in the memory of the controller.
- a high-level language processing tool can be provided outside the controller 102 that generates an object file and a symbol file by compiling and linking a high-level language program. That is, the programming tool 400 performs the process shown in FIG.
- the programming tool 400 may receive the association table 301 and the high level program as input and output a symbol table 302 that is later downloaded to the controller.
- the programming tool compiles and links the source program, compiles and links the device association table and variable names, and generates a symbol table. That is, the programming tool 400 prepares an execution file including the symbol table 302 and downloads the execution file to the PLC.
- the programming tool 400 includes a high-level language program compiling unit 401 that compiles the high-level language source program 21 input to the programming tool 400.
- the high level language source program 21 is a program written in a high level programming language.
- the high-level language program compilation unit 401 outputs the object module 24 (object file 24).
- the object file 24 corresponds to the high level language source program 21.
- the object file 24 includes machine instruction code compiled from the source code of the high-level language source program 21 and symbol information representing variables used in the high-level language source program 21.
- the programming tool 400 further includes a librarian 402 that creates the user library 26 by integrating the object file 24 and other object files.
- the link unit 403 included in the programming tool 400 links the object file 24, the user library 26, and the high-level language program standard library 27 to create the load module 29 and the symbol table 302.
- the high-level language program standard library 27 includes machine command codes for frequently used subroutines.
- the high-level language program standard library 27 is mainly provided by the provider of the high-level language program compilation unit 401. However, users can prepare their own standard library.
- the symbol table 302 includes a column or list of definitions of relationships between devices, variables, and physical addresses.
- step S601 the controller receives a request for information on a device provided in the controller or controlled by the controller. This request may be a request for reading the status of the device.
- the controller reads the symbol table 302 from the memory.
- step S ⁇ b> 603 the controller determines the physical address of the device based on the symbol table 302.
- the controller reads data stored in the physical address in the memory, and in S605, transmits the read information to the requesting peripheral device.
- An independent program may be stored in the controller, and the program may read the symbol table and read the physical address from the controller memory.
- step S701 the controller receives a data write request for a device provided in the controller or controlled by the controller.
- the controller reads the symbol table 302 from the memory.
- step S ⁇ b> 703 the controller determines the physical address of the device based on the symbol table 302.
- step S704 the controller writes data to the physical location in the read memory.
- FIG. 8 shows an example of the configuration of the controller 800 (controller 102) that performs the processing of FIGS.
- the controller 800 includes a request receiving unit 801 that receives a request from a peripheral device and determines the content of the request.
- the symbol table reading unit 802 reads the symbol table 302 stored in the memory of the controller.
- the physical address read / write unit 803 reads or writes data to / from the memory location of the controller based on the symbol table 302 and the reception request.
- the controller's memory may consist of a limited list of storage media, such as an electrical connection with one or more wires, a portable computer diskette such as a flexible disk, magnetic tape or other magnetic media, a hard disk, RAM (Random access memory), ROM (read-only memory), EPPEOM (erasable programmable memory-and-flash memory), memory cards, other memory chips and memory cartridges, optical fibers, portable CD-ROM (compact disc read) only memory), other optical media, punch cards, paper tape, other physical media with hole patterns, computers / Controller include those appropriate combination of those other medium or above, which can be read.
- a portable computer diskette such as a flexible disk, magnetic tape or other magnetic media, a hard disk
- RAM Random access memory
- ROM read-only memory
- EPPEOM erasable programmable memory-and-flash memory
- memory cards other memory chips and memory cartridges
- optical fibers portable CD-ROM (compact disc read) only memory
- punch cards paper tape, other physical media with hole patterns
- the request receiving unit 801, the symbol table reading unit 802, and the physical address reading / writing unit 803 may be implemented using a processor.
- the above embodiment provides a new controller that can execute a high-level program and further process a request specifying a device name for reading from or writing to a device from a peripheral device.
- the new controller reads the symbol table and translates the device name into a physical address that can be read or written. As a result, the new controller can respond to data access requests from peripheral devices without requiring middleware or peripheral device updates.
- the symbol table may be prepared externally by a programming tool and downloaded to the controller by the programming tool.
- the programming tool 400 may include a processor such as an application-specific integrated circuit or a digital signal processor that performs the tasks of the high-level language program compilation unit 401, the librarian 402, and the link unit 403.
- the programming tool 400 may also include suitable means for communicating with the PLC.
- the programming tool 400 may communicate with a PLC via a USB (universal serial bus).
- FIGS. 5 to 7 may be performed by a special-purpose computer that operates according to instructions stored in a tangible computer-readable storage medium.
- High-level language source program 24
- Object file 26
- User library 27
- High-level language program standard library 29
- Load module 100
- Production system 101
- Network 201 302
- Symbol table 301 Related table 311 to 316 Column 400
- Programming tool 401
- High-level language program compiling unit 402
- Librarian 403
- Link unit 801
- Request receiving unit 802
- Symbol table reading unit 803 Physical address reading / writing unit
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Abstract
Description
以下の説明では、異なる図面であっても同様の構成要素には同様の参照符号を用いる。明細書中に定義された詳細な構成や構成要素といった事項は、本発明の包括的な理解のためのものである。しかしながら、本発明は、このように特別に定義された事項がなくても実施することができる。また、徒に本発明を不明瞭とする恐れがあるため、公知の機能や構造の詳細は記載しない。
24 オブジェクトファイル
26 ユーザーライブラリ
27 高レベル言語プログラム標準ライブラリ
29 ロードモジュール
100 生産システム
101 周辺機器
102、800 コントローラ
103 ネットワーク
201、302 シンボルテーブル
301 関連テーブル
311~316 列
400 プログラミングツール
401 高レベル言語プログラムコンパイル部
402 ライブラリアン
403 リンク部
801 要求受信部
802 シンボルテーブル読み取り部
803 物理アドレス読み取り/書き込み部
Claims (5)
- 高レベル言語プログラムを実行するプログラマブルロジックコントローラのシンボルテーブルを生成するシンボルテーブル生成方法であって、
高レベル言語プログラムと、前記プログラマブルロジックコントローラにより制御されるデバイスと前記高レベル言語プログラム内の変数名との関係を規定する関連テーブルと、を読み取るステップと、
各前記変数名の物理アドレスおよび対応する前記デバイスを判定するために、前記高レベル言語プログラムと前記関連テーブルとをコンパイルしリンクさせるステップと、
前記コンパイル及びリンクにより、前記デバイスそれぞれに対して判定された前記物理アドレスを定義する前記シンボルテーブルを生成するステップと、
前記シンボルテーブルを前記プログラマブルロジックコントローラのメモリに記憶するステップと、
を含むことを特徴とするシンボルテーブル生成方法。 - 高レベル言語プログラムを実行するプログラマブルロジックコントローラによる周辺機器との通信方法であって、
前記プログラマブルロジックコントローラにより制御されるデバイスに対し読み取りまたは書き込みを行う要求を前記周辺機器から受信するステップと、
シンボルテーブルを読み取り、前記デバイスに対し前記プログラマブルロジックコントローラのメモリ内の物理アドレスを判定するステップと、
前記判定された物理アドレスに対し読み取りまたは書き込みを行うステップと、
を含むことを特徴とする周辺機器との通信方法。 - デバイスを制御するための高レベル言語プログラムを実行するプログラマブルロジックコントローラであって、
前記プログラマブルロジックコントローラにより制御されるデバイスに対し読み取りまたは書き込みを行う要求を周辺デバイスから受信する要求受信部と、
シンボルテーブルを読み取り、前記デバイスに対し前記プログラマブルロジックコントローラのメモリ内の物理アドレスを判定するシンボルテーブル読み取り部と、
前記判定された物理アドレスに対し読み取りまたは書き込みを行う物理アドレス読み取り/書き込み部と、
を備えることを特徴とするプログラマブルロジックコントローラ。 - 前記要求は前記デバイスの名称を含み、
前記シンボルテーブルは、前記デバイスの前記名称と、前記デバイスに対応し前記高レベル言語プログラムで使用される変数名と、前記変数名に対応する前記プログラマブルロジックコントローラの前記メモリ内の物理アドレスとの関係を定義することを特徴とする請求項2に記載の周辺機器との通信方法。 - 前記要求は前記デバイスの名称を含み、
前記シンボルテーブルは、前記デバイスの前記名称と、前記デバイスに対応し前記高レベル言語プログラムで使用される変数名と、前記変数名に対応する前記プログラマブルロジックコントローラの前記メモリ内の物理アドレスとの関係を定義することを特徴とする請求項3に記載のプログラマブルロジックコントローラ。
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JP2012510458A JP5079166B1 (ja) | 2011-07-01 | 2011-11-17 | シンボルテーブル生成方法、周辺機器との通信方法およびプログラマブルロジックコントローラ |
DE112011105402.5T DE112011105402T5 (de) | 2011-07-01 | 2011-11-17 | Symboltabellen-Erzeugungsverfahren; Kommunikationsverfahren mit peripherer Ausrüstung und programmierbare Logiksteuerung |
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US13/175,106 US8832670B2 (en) | 2011-07-01 | 2011-07-01 | Programmable controller and programming tool for communication with legacy equipment |
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JP2020071833A (ja) * | 2018-11-02 | 2020-05-07 | 横河電機株式会社 | エンジニアリング装置、エンジニアリング装置の制御方法及びプログラム |
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JP5864033B1 (ja) * | 2014-07-14 | 2016-02-17 | 三菱電機株式会社 | Plcシステムおよび演算式データ作成支援装置 |
JP6821497B2 (ja) * | 2017-04-27 | 2021-01-27 | 株式会社日立産機システム | 産業用コントローラのプログラム開発システム及び産業用コントローラのプログラム開発システムにおけるデータ共有方法 |
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- 2011-11-17 WO PCT/JP2011/076579 patent/WO2013005350A1/ja active Application Filing
- 2011-11-17 DE DE112011105402.5T patent/DE112011105402T5/de active Pending
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JP2020071833A (ja) * | 2018-11-02 | 2020-05-07 | 横河電機株式会社 | エンジニアリング装置、エンジニアリング装置の制御方法及びプログラム |
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