CN115098218B - Description and simulation method from FMU model to function block model in configuration software - Google Patents

Abstract

The invention discloses a description and simulation method from an FMU model to a function block model in configuration software, which includes the following steps: S1: Encapsulate the FMU model and describe the FMU model as a function block in the configuration software that complies with the IEC 61131-3 standard. Model; S2: Analyze the FMU model described as a function block model, so that the FMU model can realize simulation loading. The FMI standard has good modeling and simulation capabilities for complex simulation models or systems. Integrating the FMI standard with the IEC 61131-3 standard can better solve the simulation verification and analysis problems of complex systems and increase the collaboration capabilities between different simulation software.

Description

Description and simulation method from FMU model to function block model in configuration software

Technical field

The invention belongs to the technical field of industrial control simulation, and specifically relates to a description and simulation method from an FMU model to a functional block model in configuration software.

Background technique

Facing new trends such as upstream and downstream coupling of smart factory production processes, complex and changeable objects that are difficult to control, network collaboration and multiple sources of information, traditional PLC and DCS on-site control stations cannot cope with non-linear, time-varying, The complex production process control requirements of distributed parameters are difficult to meet the urgent needs of smart factories for intelligent sensing, autonomous decision-making and network collaboration functions. It has become a new development trend of industrial control systems to equip controllers with intelligent control capabilities for cloud-edge collaboration and achieve real-time perception, real-time control and intelligent analysis close to the field. Since programmable controller development tools require comprehensive software technology, compilation technology, graphical language programming technology, operating systems, architecture and other computer fields, they also need to be familiar with professional knowledge in the industrial control field and PLC field, and have rich industry experience. Experience, development requirements are high, difficult, investment is large, and the cycle is long. In this context, domestic controllers are at a competitive disadvantage in the practical application of large-scale smart factories. Therefore, the development and application of edge smart controllers and their programming and simulation tools with real-time perception, real-time control and support for the operation of complex intelligent algorithms are carried out. Imminent.

Contents of the invention

In order to solve the above problems, the present invention proposes a description and simulation method from the FMU model to the function block model in the configuration software.

The technical solution of the present invention is: a description and simulation method from an FMU model to a function block model in configuration software includes the following steps:

S1: Encapsulate the FMU model and describe the FMU model as a function block model in the configuration software that complies with the IEC 61131-3 standard;

S2: Analyze the FMU model described as a function block model to enable simulation loading of the FMU model.

Further, step S1 includes the following sub-steps:

S11: Construct an xml object and create a function block XML style sheet that complies with the IEC61131-10 standard;

S12: Write the corresponding element names and attribute values in each node of the function block XML style sheet, and generate an XML file that does not contain the key information of the function block;

S13: Use DOM technology to parse the XML file that does not contain key information of the function block, and extract the FMU model name, unique identifier attribute value, and key attribute value in the FMU model variable node under the root node of the description file of the FMU model;

S14: Create an empty function block interface information TXT file, map the extracted FMU model name, unique identifier attribute value, and key attribute value in the FMU model variable node to the corresponding function block description information, and use structured text language Description, write the function block description information described in structured text language into a TXT file and save it;

S15: Encapsulate the mapped function block description information.

Further, in step S15, the specific method for information encapsulation is: obtain the system timestamp through the time function, convert the obtained system timestamp, and convert it into the yyyy-MM-ddTHH:mm:ss format, and store it in the character in string array;

Traverse the function block XML style sheet, and write the FMU model name, unique identifier attribute value and execution time of the model description into the corresponding attribute value position of the corresponding node in the function block XML style sheet; call the input interface variable writing function to write the FMU model The input variable name, data type and initial value information are written into the input variable node of the function block XML style sheet; the output interface variable writing function is called to write the output variable name, data type and initial value information of the FMU model into the function block XML. The output variable node of the style sheet; call the local variable writing function to write the internal variable name, data type and initial value information of the FMU model into the local variable node of the function block XML style sheet; call the function block declaration statement function to write the internal variable name, data type and initial value information of the FMU model to the local variable node of the function block The variable information of the model is written into the plain text interface node of the function block XML style sheet to complete the encapsulation of all information.

Further, step S2 includes the following sub-steps:

S21: Create an ADS client and establish communication between the ADS client and TwinCAT3;

S22: Import the XML file generated after describing the FMU model as a function block model into the corresponding function block model in TwinCAT3, call the function block model by building the MAIN main program, and obtain the variable handle corresponding to the MAIN main program in the ADS client;

S23: Decompress the FMU model file and obtain the model description file and model implementation file;

S24: Obtain the handles of each interface function in the model implementation file;

S25: Read the unique identifier attribute value and model identification attribute value in the model description file, and call the FMU model instantiation function to instantiate the model. After the instantiation operation, enter step S26;

S26: Through the handle of the interface function, call the simulation time acquisition interface function to obtain the simulation start and end time and step size in the XML file, and set the simulation time information through the simulation time setting interface function to verify the simulation time;

S27: Solve the FMU model, and call the FMU model simulation solution interface function from the simulation start time to solve each simulation step until the verification pass simulation time is reached;

S28: Assign the FMU model solution result to the variable handle corresponding to the MAIN main program, so that the FMU model can be loaded for simulation.

Further, in step S25, calculating one simulation step size corresponds to calling the FMU model simulation solution interface function once.

The beneficial effects of the present invention are:

(1) The expression of the FMU model into the function block model can realize the reuse of the FMU model in the configuration programming software, avoid the manual reconstruction of the simulation model, and greatly expand the application field of the configuration programming software;

(2) The FMI standard has good modeling and simulation capabilities for complex simulation models or systems. Integrating the FMI standard with the IEC61131-3 standard can better solve the simulation verification and analysis problems of complex systems and increase collaboration between different simulation software. ability.

Description of the drawings

Figure 1 is a flow chart of the description and simulation method from the FMU model to the function block model in the configuration software;

Figure 2 is a schematic diagram of the overall model expression design plan;

Figure 3 is the flow chart of importing and converting FMU model description files;

Figure 4 is a flow chart describing the FMU model to the IEC61131-3 standard function block model;

Figure 5 is a schematic diagram of the overall functional design scheme of the model description middle plug-in.

Detailed ways

The embodiments of the present invention will be further described below with reference to the accompanying drawings.

Before describing the specific embodiments of the present invention, in order to make the solution of the present invention more clear and complete, the abbreviations and key terms appearing in the present invention are first explained:

IEC 61131-3 standard: IEC 61131-3 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. The common elements include: data type definitions, variables, software model elements, software models, program organization units, etc. The function block belongs to the program organization unit, which is a basic program organization unit that has been defined in advance and contains standard processing functions.

The FMI standard can be translated as "Functional Model Interface" standard, which is essentially a third-party universal model interface standard. FMU models packaged based on this standard can be used directly in any software that supports this standard; FMU can be translated as "Functional Model" "Unit" is a portable and callable model library encapsulated based on the FMI standard, which contains the source code and model description files required for model operation.

The IEC 61131-10 standard is developed on the basis of PLCopen XML and extends the functionality of PLCopen XML. The IEC 61131-10 standard specifies an XML-based exchange format for the export and import of IEC 61131-3 projects that enables the transfer of complete IEC 61131-3 projects implemented in an IEC 61131-3 environment between different programming environments, Including configuration elements, data types, and program organization units written according to standard programming languages.

As shown in Figure 1, the present invention provides a description and simulation method from the FMU model to the function block model in the configuration software, which includes the following steps:

S1: Encapsulate the FMU model and describe the FMU model as a function block model in the configuration software that complies with the IEC 61131-3 standard;

S2: Analyze the FMU model described as a function block model to enable simulation loading of the FMU model.

In the embodiment of the present invention, step S1 includes the following sub-steps:

S11: Construct an xml object and create a function block XML style sheet that complies with the IEC61131-10 standard;

S12: Write the corresponding element names and attribute values in each node of the function block XML style sheet, and generate an XML file that does not contain the key information of the function block;

S13: Use DOM technology to parse the XML file that does not contain key information of the function block, and extract the FMU model name, unique identifier attribute value, and key attribute value in the FMU model variable node under the root node of the description file of the FMU model;

S14: Create an empty function block interface information TXT file, map the extracted FMU model name, unique identifier attribute value, and key attribute value in the FMU model variable node to the corresponding function block description information, and use structured text language Description, write the function block description information described in structured text language into a TXT file and save it;

S15: Encapsulate the mapped function block description information.

In step S13, the FMU model name (modelName) and the value of the guid attribute in the FMU model description file as well as the key attribute information of the FMU model variable (model variable name, variable data type, including Real, Integer, Boolean, etc., variable property causality and the initial values of the model variables) are extracted.

In the embodiment of the present invention, in step S15, the specific method for encapsulating information is: obtaining the system timestamp through a time function, converting the obtained system timestamp, and converting it into the yyyy-MM-ddTHH:mm:ss format , stored in the string array;

Traverse the function block XML style sheet, and write the FMU model name, unique identifier attribute value and execution time of the model description into the corresponding attribute value position of the corresponding node in the function block XML style sheet; call the input interface variable writing function to write the FMU model The input variable name, data type and initial value information are written into the input variable node of the function block XML style sheet; the output interface variable writing function is called to write the output variable name, data type and initial value information of the FMU model into the function block XML. The output variable node of the style sheet; call the local variable writing function to write the internal variable name, data type and initial value information of the FMU model into the local variable node of the function block XML style sheet; call the function block declaration statement function to write the internal variable name, data type and initial value information of the FMU model to the local variable node of the function block The variable information of the model is written into the plain text interface node of the function block XML style sheet to complete the encapsulation of all information.

In the embodiment of the present invention, the FMU model is described as a function block model. The generated "FMU" function block only contains information such as basic input and output interface variables, data types of variables, and initial values. The specific logic implementation is through analysis. After the processor parses the FMU model, it maps the input and output data to the corresponding function block input and output variables. That is, from the surface, the FMU function block can be regarded as an "empty box", and the specific logical calculation is through " The FMU parser in the "box" is implemented by parsing the model. Step S2 includes the following sub-steps:

S21: Create an ADS client and establish communication between the ADS client and TwinCAT3;

S22: Import the XML file generated after describing the FMU model as a function block model into the corresponding function block model in TwinCAT3, call the function block model by building the MAIN main program, and obtain the variable handle corresponding to the MAIN main program in the ADS client;

S23: Decompress the FMU model file and obtain the model description file and model implementation file;

S24: Obtain the handles of each interface function in the model implementation file;

S25: Read the unique identifier attribute value and model identification attribute value in the model description file, and call the FMU model instantiation function to instantiate the model. After the instantiation operation, enter step S26;

S26: Through the handle of the interface function, call the simulation time acquisition interface function to obtain the simulation start and end time and step size in the XML file, and set the simulation time information through the simulation time setting interface function to verify the simulation time;

S27: Solve the FMU model, and call the FMU model simulation solution interface function from the simulation start time to solve each simulation step until the verification pass simulation time is reached;

S28: Assign the FMU model solution result to the variable handle corresponding to the MAIN main program, so that the FMU model can be loaded for simulation.

In step S21, if TwinCAT3 is integrated in the local Visual Studio, you do not need to set the AMSNETID and only need to establish communication through the 851 port number. If TwinCAT3 is not local, you need to set the port number and the target AMSNETID at the same time.

In step S23, the model description file is obtained by calling 7-Zip software to decompress the FMU file.

In the embodiment of the present invention, in step S25, calculating one simulation step corresponds to calling the FMU model simulation solution interface function once.

In the embodiment of the present invention, the problem that the present invention needs to solve is to provide a description method of the FMU model to the IEC61131-3 standard function block model and a joint simulation method of the FMU model under the IEC61131-3 standard at the presentation layer. FMI/FMU is introduced into the field of industrial control to solve the problems of poor compatibility and poor openness of traditional configuration software.

The present invention designs an intermediate plug-in based on the characteristics of the FMU model and the IEC 61131-3 standard function block model structure and the model description file under the presentation layer FMI standard, and uses XML technology to describe the FMU model as the IEC 61131-3 standard function block model; The model execution layer designs the solution of the FMU model based on the joint simulation method. It calls the FMU model DLL library function to solve the FMU model by parsing the FMU file, and establishes communication with the configuration software based on the ADS communication method and performs the calculation of the FMU model. Interface binding and data transmission, and finally the expression of the FMU model is realized. The overall model expression design plan is shown in Figure 2.

In view of the fact that models under both standards can store model variable information in the form of XML files, through the IEC61131-3 standard and FMI standard in data type, function block, name space, storage space, task binding, target platform service interface specification Research in other aspects uses XML technology to realize the mapping of FMU model analysis and its data parameters to a unified software model, and presents it as a function block that can be configured and programmed together with POU, as shown in Figure 2.

The entire model description process can be divided into two levels. The first part is to import the FMU model description file (modelDescription.xml) and extract the key parameter information of the FMU model; the second part is to build the IEC 61131-10 standard. Project file style sheet, and write the extracted information into the IEC 61131-10 standard style sheet, generate an XML project file, and then import it into the simulation tool through the XML interface and run it, and finally generate the IEC61131-3 standard function block model. The process of describing the FMU model file as function blocks is shown in Figure 4.

The middle plug-in implementation describes the FMU model as a function block model according to the IEC 61131-3 standard. According to the process described by the model, the modular idea is used to subdivide the functions of the middleware. The middle plug-in function is shown in Figure 5.

The beneficial effects of the present invention are:

(1) The expression of the FMU model into the function block model can realize the reuse of the FMU model in the configuration programming software, avoid the manual reconstruction of the simulation model, and greatly expand the application field of the configuration programming software;

(2) The FMI standard has good modeling and simulation capabilities for complex simulation models or systems. Integrating the FMI standard with the IEC61131-3 standard can better solve the simulation verification and analysis problems of complex systems and increase collaboration between different simulation software. ability.

Those of ordinary skill in the art will appreciate that the embodiments described here are provided to help readers understand the principles of the present invention, and it should be understood that the scope of the present invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations based on the technical teachings disclosed in the present invention without departing from the essence of the present invention, and these modifications and combinations are still within the protection scope of the present invention.

Claims (3)

1. The method for describing and simulating the function block model from the FMU model to the configuration software is characterized by comprising the following steps:

s1: packaging an FMU model, and describing the FMU model as a functional block model conforming to IEC61131-3 standard in configuration software;

s2: analyzing the FMU model described as the functional block model so as to enable the FMU model to realize simulation loading;

said step S1 comprises the sub-steps of:

s11: constructing an XML object and creating a function block XML style sheet conforming to IEC61131-10 standard;

s12: writing corresponding element names and attribute values in each node of the function block XML style sheet to generate an XML file which does not contain key information of the function block;

s13: analyzing an XML file which does not contain key information of the functional blocks through a DOM technology, and extracting an FMU model name, a unique identifier attribute value and a key attribute value in a variable node of the FMU model under a description file root node of the FMU model;

s14: creating an empty function block interface information TXT file, mapping the extracted FMU model name, unique identifier attribute value and key attribute value in FMU model variable nodes into corresponding function block description information, describing by using a structured text language, and writing the function block description information described by using the structured text language into the TXT file for storage;

s15: information packaging is carried out on the mapped functional block description information;

said step S2 comprises the sub-steps of:

s21: creating an ADS client, and establishing communication between the ADS client and TwinCAT 3;

s22: the FMU model is described as a functional block model, an XML file generated after the functional block model is described is imported into a corresponding functional block model in TwainCAT 3, the functional block model is called through a MAIN MAIN program, and a variable handle corresponding to the MAIN MAIN program is obtained from an ADS client;

s23: decompressing the FMU model file to obtain a model description file and a model realization file;

s24: acquiring handles of all interface functions in the model realization file;

s25: reading a unique identifier attribute value and a model identification attribute value in a model description file, calling an FMU model instantiation function to carry out instantiation operation on a model, and entering step S26 after the instantiation operation;

s26: calling a simulation time obtaining interface function to obtain 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 the simulation time;

s27: solving the FMU model, and starting to call an FMU model simulation solving interface function from simulation starting time to solve each simulation step length until verification passes simulation time duration;

s28: and assigning the FMU model solving result to a variable handle corresponding to the MAIN MAIN program so as to enable the FMU model to realize simulation loading.

2. The method for describing and simulating the functional block model from the FMU model to the configuration software according to claim 1, wherein in step S15, the specific method for performing information encapsulation 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 yyyy-MM-ddTHH: MM: ss format in a character string array;

traversing the XML style sheet of the functional block, 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 XML style sheet of the functional block; calling an input interface variable writing function, and writing the input variable name, the data type and initial value information of the FMU model into input variable nodes of the XML style sheet of the functional block; calling an output interface variable writing function, and writing the output variable name, the data type and 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 writing function, and writing the internal variable name, the data type and initial value information of the FMU model into local variable nodes of the XML style sheet of the functional block; calling a statement sentence function of the functional block, writing variable information according to the FMU model into a plain text interface node of an XML style sheet of the functional block, and completing encapsulation of all information.

3. The method for describing and simulating a functional block model from an FMU model to configuration software according to claim 1, wherein in step S25, a simulation step is calculated and a simulation solution interface function of the FMU model is called once.