CN115098218A - Method for describing and simulating functional block model from FMU (functional modeling Unit) model to configuration software - Google Patents
Method for describing and simulating functional block model from FMU (functional modeling Unit) model to configuration software Download PDFInfo
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Abstract
The invention discloses a method for describing and simulating a functional block model from an FMU (functional modeling Unit) model to configuration software, which comprises the following steps of: s1: packaging an FMU model, and describing the FMU model as a functional block model which accords with IEC61131-3 standard in configuration software; s2: and analyzing the FMU model described as the function block model so as to enable the FMU model to realize simulation loading. The FMI standard has good modeling simulation capability on a complex simulation model or system, and the FMI standard and the IEC61131-3 standard are integrated, so that the problem of simulation verification analysis of the complex system can be better solved, and the cooperation capability among different simulation software is increased.
Description
Technical Field
The invention belongs to the technical field of industrial control simulation, and particularly relates to a method for describing and simulating a functional block model from an FMU (failure mode unit) model to configuration software.
Background
In the face of the new situations of upstream and downstream coupling of the production process of an intelligent factory, complex and variable objects, difficult control, network cooperation, multi-source information and the like, the field control station of the traditional PLC and DCS cannot meet the complex production process control requirements of nonlinear, time-varying and distributed parameters due to limited calculation and storage resources, and the urgent requirements of the intelligent factory on intelligent sensing, autonomous decision making and network cooperation functions are difficult to meet. The controller has the intelligent control capability of cloud-edge cooperation, realizes real-time sensing, real-time control and intelligent analysis close to a field end, and becomes a new development trend of an industrial control system. The programmable controller development tool needs to integrate professional knowledge in the computer fields of software technology, compiling technology, graphical language programming technology, operating system, system structure and the like, also needs to be familiar with professional knowledge in the industrial control field and the PLC field, has rich industrial experience, and has high development requirement, great difficulty, great investment and long period. Under the background, the domestic controller is in competitive disadvantage in the practical application of a large-scale intelligent factory, so that the development and application of the edge intelligent controller with real-time perception, real-time control and support of complex intelligent algorithm operation and the development and application of programming and simulation tools thereof are urgent.
Disclosure of Invention
In order to solve the problems, the invention provides a method for describing and simulating a function block model from an FMU (functional modeling unit) model to configuration software.
The technical scheme of the invention is as follows: a description and simulation method from an FMU model to a function block model in configuration software comprises the following steps:
s1: packaging an FMU model, and describing the FMU model as a functional block model meeting IEC61131-3 standard in configuration software;
s2: and analyzing the FMU model described as the function block model so as to enable the FMU model to realize simulation loading.
Further, step S1 includes the following sub-steps:
s11: constructing an XML object, and creating a function block XML style sheet which accords with IEC61131-10 standard;
s12: writing corresponding element names and attribute values into each node of the function block XML style sheet to generate an XML file which does not contain the key information of the function block;
s13: analyzing an XML file which does not contain the key information of the functional block through a DOM (document object model) technology, and extracting an FMU model name, a unique identifier attribute value and a key attribute value in an FMU model variable node under a description file root node of the FMU model;
s14: creating an empty functional block interface information TXT file, mapping the extracted FMU model name, unique identifier attribute value and key attribute value in FMU model variable node to corresponding functional block description information, describing by using a structured text language, and writing the functional block description information described by using the structured text language into the TXT file for saving;
s15: and packaging the information of the description information of the mapped functional blocks.
Further, in step S15, the specific method for encapsulating information is as follows: acquiring a system time stamp through a time function, converting the acquired system time stamp, converting the system time stamp into yyyy-MM-ddTHH (MM: ss format), and storing the converted system time stamp into a character string array;
traversing the function block XML style sheet, and writing the FMU model name, the unique identifier attribute value and the time for executing the model description into the position of the corresponding attribute value of the corresponding node of the function block XML style sheet; calling an input interface variable write-in function, and writing the input variable name, the data type and the initial value information of the FMU model into an input variable node of an XML style sheet of a functional block; calling an output interface variable write-in function, and writing the output variable name, the data type and the initial value information of the FMU model into an output variable node of the XML style sheet of the functional block; calling a local variable write-in function, and writing the internal variable name, the data type and the initial value information of the FMU model into a local variable node of an XML style sheet of a functional block; and calling a function block declaration sentence function, writing variable information according to the FMU model into a plain text interface node of the function block XML style sheet, and finishing the packaging of all information.
Further, step S2 includes the following sub-steps:
s21: establishing an ADS client, and establishing communication between the ADS client and TwinCAT 3;
s22: importing an XML file generated after an FMU model is described as a function block model into a corresponding function block model in TwinCAT3, calling the function block model by constructing an MAIN MAIN program, and acquiring a variable handle corresponding to the MAIN MAIN program from an ADS client;
s23: decompressing the FMU model file to obtain a model description file and a model implementation file;
s24: acquiring handles of all interface functions in a model implementation file;
s25: reading the unique identifier attribute value and the model identification attribute value in the model description file, calling an FMU model instantiation function to perform instantiation operation on the model, and entering step S26 after the instantiation operation;
s26: calling a simulation time acquisition interface function to acquire simulation start-stop time and step length in an XML file through a handle of the interface function, setting simulation time information through the simulation time setting interface function, and verifying simulation time;
s27: solving the FMU model, calling an FMU model simulation solving interface function from the simulation starting time to solve each simulation step length until the simulation time duration is passed through verification;
s28: and assigning the solving result of the FMU model to a variable handle corresponding to the MAIN program of the MAIN so as to realize the simulation loading of the FMU model.
Further, in step S25, calculating a simulation step size and calling an FMU model simulation solving interface function once.
The beneficial effects of the invention are:
(1) the FMU model can be reused on the configuration programming software through the expression from the FMU model to the function block model, the manual reconstruction work of the simulation model can be avoided, and the application field of the configuration programming software is greatly expanded;
(2) the FMI standard has good modeling simulation capability on a complex simulation model or system, and the FMI standard and the IEC61131-3 standard are integrated, so that the problem of simulation verification analysis of the complex system can be better solved, and the cooperation capability among different simulation software is increased.
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FIG. 1 is a flow chart of a method for describing and simulating a function block model from an FMU model to configuration software;
FIG. 2 is a schematic representation of a global model expression design;
FIG. 3 is a flow chart of import and transformation of an FMU model description file;
FIG. 4 is a flow chart of FMU model to IEC61131-3 standard function block model description;
FIG. 5 is a diagram illustrating the overall functional design of the middleware for model description.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
Before describing particular embodiments of the present invention, in order to make the aspects of the present invention more clear and complete, the definitions of abbreviations and key terms appearing in the present invention will be explained:
IEC61131-3 standard: IEC61131-3 is a globally relevant standard for the development of Programmable Logic Controllers (PLCs). The IEC61131-3 standard contains a lot of content, including five programming languages and common elements. Wherein the common elements include: data type definitions, variables, software model elements, software models, program organization units, and the like. The function block belongs to a program organization unit, and is a basic program organization unit which is defined in advance and contains standard processing functions.
The FMI standard can be translated into a 'functional model interface' standard, and is essentially a third-party universal model interface standard, and an FMU model packaged based on the standard can be directly used in any software supporting the standard; the FMU can be translated into a 'functional model unit', and is a portable and callable model library packaged based on the FMI standard, and the model library internally contains source codes required by the running of a model and a model description file.
The IEC61131-10 standard was developed on the basis of PLCopen XML and extends the functionality of PLCopen XML. The IEC61131-10 standard specifies an XML-based interchange format for the export and import of IEC61131-3 items, and the complete IEC61131-3 items implemented in the IEC61131-3 environment can be transferred between different programming environments, including configuration elements, data types, and program organization units written according to standard programming languages, etc.
As shown in fig. 1, the present invention provides a method for describing and simulating an FMU model to a function block model in configuration software, comprising the following steps:
s1: packaging an FMU model, and describing the FMU model as a functional block model which accords with IEC61131-3 standard in configuration software;
s2: and analyzing the FMU model described as the function block model so as to enable the FMU model to realize simulation loading.
In the embodiment of the present invention, step S1 includes the following sub-steps:
s11: constructing an XML object, and creating a function block XML style sheet which accords with IEC61131-10 standard;
s12: writing corresponding element names and attribute values into each node of the function block XML style sheet to generate an XML file which does not contain the key information of the function block;
s13: analyzing an XML file which does not contain the key information of the functional block through a DOM (document object model) technology, and extracting an FMU model name, a unique identifier attribute value and a key attribute value in an FMU model variable node under a description file root node of the FMU model;
s14: creating an empty functional block interface information TXT file, mapping the extracted FMU model name, unique identifier attribute value and key attribute value in FMU model variable node to corresponding functional block description information, describing by using a structured text language, and writing the functional block description information described by using the structured text language into the TXT file for saving;
s15: and packaging the mapped function block description information.
In step S13, the values of the FMU model name (modelName) and the guid attribute in the FMU model description file and the key attribute information of the FMU model variable (model variable name, variable data type including Real, Integer, Boolean, etc., variable property, and initial value of the model variable) are extracted.
In the embodiment of the present invention, in step S15, a specific method for performing information encapsulation is: acquiring a system time stamp through a time function, converting the acquired system time stamp, converting the converted system time stamp into yyyy-MM-ddTHH (MM: ss) format, and storing the converted system time stamp in a character string array;
traversing the function block XML style sheet, and writing the FMU model name, the unique identifier attribute value and the time described by the execution model into the position of the corresponding attribute value of the corresponding node of the function block XML style sheet; calling an input interface variable write-in function, and writing the input variable name, the data type and the initial value information of the FMU model into an input variable node of an XML style sheet of a functional block; calling an output interface variable write-in function, and writing the output variable name, the data type and the initial value information of the FMU model into an output variable node of the XML style sheet of the functional block; calling a local variable write-in function, and writing the internal variable name, the data type and the initial value information of the FMU model into a local variable node of an XML style sheet of a functional block; and calling a function block statement function, writing variable information according to the FMU model into a plain text interface node of the function block XML style sheet, and finishing the packaging of all information.
In the embodiment of the invention, an FMU model is described as a function block model, a generated 'FMU' function block only contains information such as basic input/output interface variables, data types of the variables, initial values and the like, and a specific logic implementation is realized by mapping input/output data to corresponding function block input/output variables after an analyzer analyzes the FMU model, that is, the FMU function block can be regarded as an 'empty box' from the surface, and a specific logic calculation is realized by analyzing the model through an FMU analyzer in the 'box'. Step S2 includes the following substeps:
s21: establishing an ADS client, and establishing communication between the ADS client and TwinCAT 3;
s22: importing an XML file generated after an FMU model is described as a function block model into a corresponding function block model in TwinCAT3, calling the function block model by constructing an MAIN MAIN program, and acquiring a variable handle corresponding to the MAIN MAIN program from an ADS client;
s23: decompressing the FMU model file to obtain a model description file and a model implementation file;
s24: acquiring handles of all interface functions in a model implementation file;
s25: reading the unique identifier attribute value and the model identification attribute value in the model description file, calling an FMU model instantiation function to perform instantiation operation on the model, and entering step S26 after the instantiation operation;
s26: calling a simulation time acquisition interface function to acquire simulation start-stop time and step length in an XML file through a handle of the interface function, setting simulation time information through the simulation time setting interface function, and verifying simulation time;
s27: solving the FMU model, calling an FMU model simulation solving interface function from the simulation starting time to solve each simulation step length until the simulation time duration is passed through verification;
s28: and assigning the solving result of the FMU model to a variable handle corresponding to the MAIN program of the MAIN so as to realize the simulation loading of the FMU model.
In step S21, if the TwinCAT3 is integrated in the local Visual Studio, the AMSNETID may not be set, and the communication may be established only by the port number 851, and if the TwinCAT3 is not local, the port number and the target AMSNETID may be set at the same time.
In step S23, the FMU file is decompressed by calling 7-Zip software to obtain a model description file.
In the embodiment of the present invention, in step S25, calculating a simulation step size corresponds to calling an FMU model simulation solving interface function once.
In the embodiment of the invention, the problems to be solved by the invention are that a description method of an FMU model to an IEC61131-3 standard function block model and an FMU model combined simulation method under the IEC61131-3 standard are provided at a presentation layer, and the problems of poor compatibility and poor openness of the traditional configuration software are solved by introducing FMI/FMU into the field of industrial control.
In the invention, an intermediate plug-in is designed according to the characteristics of FMU model, IEC61131-3 standard function block model structure and model description files under the presentation layer FMI standard, and the FMU model is described as the IEC61131-3 standard function block model by adopting XML technology; the FMU model based on the combined simulation mode is designed on a model execution layer, an FMU file is analyzed to call an FMU model DLL library function to solve the FMU model, communication is established with configuration software based on an ADS communication mode, interface binding and data transmission of the FMU model are carried out, and finally the FMU model is expressed, and the overall model expression design scheme is shown in figure 2.
Considering that models under two standards can store model variable information in the form of XML files, by researching IEC61131-3 standard and FMI standard in the aspects of data types, function blocks, name spaces, storage spaces, task bindings, target platform service interface specifications and the like, the XML technology is adopted to realize the parsing of FMU models and the mapping of data parameters thereof to uniform software models, and the FMU models are presented as function blocks which can be configured and programmed together with POUs, as shown in fig. 2.
The whole model description process can be divided into two layers, wherein the first part is to import an FMU model description file (model description.xml) and extract key parameter information of an FMU model from the FMU model description file; and the second part is to construct an engineering file style sheet of the IEC61131-10 standard, write the extracted information into the style sheet of the IEC61131-10 standard to generate an XML engineering file, then import the XML file into a simulation tool through an XML interface and operate the XML file, and finally generate a function block model of the IEC61131-3 standard. The flow of the FMU model file as a function block is shown in FIG. 4.
The middleware realizes that the FMU model is described as a function block model of IEC61131-3 standard, the functions of the middleware are subdivided and designed by adopting a modularized idea according to the flow described by the model, the function of the middleware is shown in figure 5,
the invention has the beneficial effects that:
(1) the FMU model can be reused on the configuration programming software through the expression from the FMU model to the function block model, the manual reconstruction work of the simulation model can be avoided, and the application field of the configuration programming software is greatly expanded;
(2) the FMI standard has good modeling simulation capability on a complex simulation model or system, and the FMI standard and the IEC61131-3 standard are integrated, so that the problem of simulation verification analysis of the complex system can be better solved, and the cooperation capability among different simulation software is increased.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (5)
1. A description and simulation method from an FMU model to a function block model in configuration software is characterized by comprising the following steps:
s1: packaging an FMU model, and describing the FMU model as a functional block model meeting IEC61131-3 standard in configuration software;
s2: and analyzing the FMU model described as the function block model so as to enable the FMU model to realize simulation loading.
2. The method for describing and simulating a functional block model from an FMU model to a configuration software as claimed in claim 1, wherein the step S1 comprises the following sub-steps:
s11: constructing an XML object, and creating a function block XML style sheet which accords with the IEC61131-10 standard;
s12: writing corresponding element names and attribute values into each node of the function block XML style sheet to generate an XML file which does not contain the key information of the function block;
s13: analyzing an XML file which does not contain the key information of the functional block through a DOM (document object model) technology, and extracting an FMU model name, a unique identifier attribute value and a key attribute value in an FMU model variable node under a description file root node of the FMU model;
s14: creating an empty functional block interface information TXT file, mapping the extracted FMU model name, unique identifier attribute value and key attribute value in FMU model variable node to corresponding functional block description information, describing by using a structured text language, and writing the functional block description information described by using the structured text language into the TXT file for saving;
s15: and packaging the mapped function block description information.
3. The method for describing and simulating the functional block model from the FMU model to the configuration software as claimed in claim 2, wherein the step S15 comprises the following steps: acquiring a system time stamp through a time function, converting the acquired system time stamp, converting the converted system time stamp into yyyy-MM-ddTHH (MM: ss) format, and storing the converted system time stamp into a character string array;
traversing the function block XML style sheet, and writing the FMU model name, the unique identifier attribute value and the time for executing the model description into the position of the corresponding attribute value of the corresponding node of the function block XML style sheet; calling an input interface variable write-in function, and writing the input variable name, the data type and the initial value information of the FMU model into an input variable node of an XML style sheet of a functional block; calling an output interface variable write-in function, and writing the output variable name, the data type and the initial value information of the FMU model into an output variable node of the XML style sheet of the functional block; calling a local variable write-in function, and writing the internal variable name, the data type and the initial value information of the FMU model into a local variable node of the XML style sheet of the function block; and calling a statement function of the functional block declaration, and writing variable information according to the FMU model into a plain text interface node of the XML style sheet of the functional block to finish the packaging of all information.
4. The method for describing and simulating a functional block model from an FMU model to a configuration software as claimed in claim 1, wherein the step S2 comprises the following sub-steps:
s21: establishing an ADS client, and establishing communication between the ADS client and TwinCAT 3;
s22: importing an XML file generated after an FMU model is described as a function block model into a corresponding function block model in TwinCAT3, calling the function block model by constructing an MAIN MAIN program, and acquiring a variable handle corresponding to the MAIN MAIN program from an ADS client;
s23: decompressing the FMU model file to obtain a model description file and a model implementation file;
s24: acquiring handles of all interface functions in a model implementation file;
s25: reading the unique identifier attribute value and the model identification attribute value in the model description file, calling an FMU model instantiation function to perform instantiation operation on the model, and entering step S26 after the instantiation operation;
s26: calling the simulation time acquisition interface function to acquire the simulation start-stop time and the simulation step length in the XML file through the handle of the interface function, setting the simulation time information through the simulation time setting interface function, and verifying the simulation time;
s27: solving the FMU model, calling an FMU model simulation solving interface function from the simulation starting time to solve each simulation step length until the simulation time duration is passed through verification;
s28: and assigning the solving result of the FMU model to a variable handle corresponding to the MAIN program of the MAIN so as to realize the simulation loading of the FMU model.
5. The method for describing and simulating an FMU model to a function block model in configuration software as claimed in claim 4, wherein the step S25 is performed by calculating a simulation step size and calling an FMU model simulation solution interface function once.
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| PL442676A1 (en) * | 2022-10-28 | 2024-04-29 | Politechnika Śląska | Multi-channel pulse duration measurement system |
| CN117632114A (en) * | 2024-01-24 | 2024-03-01 | 浙江大学 | FMU file importing method and device based on file analysis |
| CN117632114B (en) * | 2024-01-24 | 2024-05-17 | 浙江大学 | FMU file importing method and device based on file analysis |
| CN117785430A (en) * | 2024-02-23 | 2024-03-29 | 湖南汇创玮达信息科技有限公司 | FMU model hybrid simulation scheduling method and device based on theme |
| CN117785430B (en) * | 2024-02-23 | 2024-05-14 | 湖南汇创玮达信息科技有限公司 | FMU model hybrid simulation scheduling method and device based on theme |
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