CN109871585B - Drawing control method and system - Google Patents
Drawing control method and system Download PDFInfo
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- CN109871585B CN109871585B CN201910047876.4A CN201910047876A CN109871585B CN 109871585 B CN109871585 B CN 109871585B CN 201910047876 A CN201910047876 A CN 201910047876A CN 109871585 B CN109871585 B CN 109871585B
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Abstract
The invention discloses a drawing control method and a drawing control system, wherein an original CAD drawing file and a preset PLC control parameter are converted into a first CAD file with a specific data format, an HMI analyzes the first CAD file to obtain a preset PLC control parameter and a path coordinate set and sends the preset PLC control parameter and the path coordinate set to a PLC through a specific HMI-PLC protocol, so that the PLC controls a drawing motion mechanism to complete interpolation drawing according to the preset PLC control parameter and the path coordinate set, the technical problem of low communication speed of a drawing control method in the prior art is solved, the data rapid communication is realized, and the safety of transmitted data is high.
Description
Technical Field
The invention relates to the field of drawing, in particular to a drawing control method and a drawing control system.
Background
PLC: a programmable logic controller.
HMI is an abbreviation for Human Machine Interface, also called Human Machine Interface, also referred to as Human Machine interaction device. A human-machine interface (also called user interface or user interface) is a medium for interaction and information exchange between a system and a user, and it implements conversion between an internal form of information and a human-acceptable form.
The HMI consists of two parts of hardware and software, referring to fig. 1, fig. 1 is a hardware part schematic diagram of the HMI, and the hardware part comprises a processor, a display unit, an input unit, a communication interface, a data storage unit and the like, wherein the performance of the processor determines the performance of the HMI product, and is a core unit of the HMI. According to different product grades of the HMI, the processors can respectively adopt 8-bit processors, 16-bit processors and 32-bit processors. The HMI software is generally divided into two parts, i.e., system software running in the HMI hardware and screen configuration software (such as JB-HMI screen configuration software) running under the Windows operating system of the PC. The user must first use the HMI picture configuration software to make the project file, and then download the project file to the HMI processor through the serial communication port of PC and HMI product. The HMI can also be connected with industrial control equipment such as a Programmable Logic Controller (PLC), a frequency converter, a direct current speed regulator, an instrument and the like, display is carried out by utilizing a display unit, and working parameters or operation commands are written in through an input unit (such as a touch screen, a keyboard, a mouse and the like) to realize information interaction between a human and a machine.
As is known, many industries still adopt the scheme of 'industrial personal computer + motion controller', and the industrial personal computer + motion controller has the advantages of lower flexibility, heavier weight and higher cost. In industrial production, automatic path planning and corresponding operation execution are important issues of industrial automation. The combination of the PLC and the CAD path track can be applied to the fields of welding, cutting, dispensing and the like according to the track, and the great labor and time cost can be saved when a plurality of products with different properties or more complex are processed. For example, a graph generated by drawing of AutoCAD software is imported into a PLC, and 2 servo motors are driven by the PLC to easily meet the requirement of planar motion control, but the communication speed of the scheme is slow, and normal production work is seriously affected, so that the technology needs to be improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a drawing control method and system for increasing the communication speed of the drawing control method.
The embodiment of the invention adopts the technical scheme that:
in a first aspect, a drawing control method is provided, including:
CAD drawing file preprocessing: converting an original CAD drawing file and a preset PLC control parameter into a first CAD file with a specific data format;
HMI sending step: the HMI analyzes the first CAD file to obtain the preset PLC control parameter and the path coordinate set, and sends the preset PLC control parameter and the path coordinate set to the PLC according to a specific HMI-PLC protocol;
drawing: and the PLC controls the drawing motion mechanism to perform interpolation drawing according to the preset PLC control parameters and the path coordinate set.
Further, the CAD drawing file preprocessing step comprises the following steps:
and a CAD drawing file data extraction sub-step: extracting file data according to the original CAD drawing file and planning a path to obtain the path coordinate set;
a conversion substep: and converting the path coordinate set and the preset PLC control parameter to obtain the first CAD file.
Further, the drawing step includes:
the PLC sets working parameters of the PLC according to the preset PLC control parameters;
and the PLC generates a final path coordinate set according to the preset PLC control parameter, the path coordinate set and an interpolation algorithm so as to control a drawing motion mechanism to perform interpolation drawing.
Further, the preset PLC control parameter includes a total number of bytes of the file and/or a total number of graphics and/or a total number of bytes of the graphics and/or a name of the graphics and/or a serial number of the PLC control plane system and/or a drawing speed and/or an acceleration/deceleration and/or an offset.
Further, the path coordinate set comprises a path graph line number and/or a line type and/or a dashed solid line and/or line coordinate data.
Further, the drawing control method further includes:
a feedback display step: and when the PLC controls the drawing motion mechanism to perform interpolation drawing, the current drawing coordinate is fed back to the HMI in real time to be displayed.
In a second aspect, there is provided a drawing control system comprising:
the CAD drawing file preprocessing unit is used for executing the CAD drawing file preprocessing step and converting the original CAD drawing file and the preset PLC control parameters into a first CAD file with a specific data format;
the HMI is used for executing an HMI sending step, and the HMI analyzes the preset PLC control parameters and the path coordinate set according to the first CAD file and sends the preset PLC control parameters and the path coordinate set to the PLC according to a specific HMI-PLC protocol;
and the PLC is used for controlling the drawing motion mechanism to perform interpolation drawing according to the preset PLC control parameters and the path coordinate set.
Further, the CAD drawing file preprocessing unit includes:
the CAD drawing file data extraction module is used for extracting file data according to the original CAD drawing file and planning a path to obtain the path coordinate set;
and the conversion module is used for converting the path coordinate set and the preset PLC control parameter to obtain the first CAD file.
Further, the PLC sets working parameters of the PLC according to the preset PLC control parameters;
and the PLC generates a final path coordinate set according to the preset PLC control parameter, the path coordinate set and an interpolation algorithm so as to control a drawing motion mechanism to perform interpolation drawing.
Further, the drawing control system further includes:
and the feedback display unit is used for executing a feedback display step, and the PLC controls the drawing motion mechanism to feed the current drawing coordinate back to the HMI in real time for display when performing interpolation drawing.
The invention has the beneficial effects that:
according to the invention, the original CAD drawing file and the preset PLC control parameter are converted into the first CAD file with a specific data format, the HMI analyzes the first CAD file to obtain the preset PLC control parameter and the path coordinate set and sends the preset PLC control parameter and the path coordinate set to the PLC through the specific HMI-PLC protocol, so that the PLC controls the drawing motion mechanism to complete interpolation drawing according to the preset PLC control parameter and the path coordinate set, the technical problem of low communication speed of a drawing control method in the prior art is solved, the data rapid communication is realized, and the safety of transmitted data is high.
In addition, the invention also realizes interpolation drawing according to the path coordinate set and the interpolation algorithm.
Drawings
FIG. 1 is a hardware portion schematic of an HMI;
FIG. 2 is a flowchart of a method of an embodiment of a graphics control method of the present invention;
FIG. 3 is a flowchart illustrating an embodiment of a graphics control method according to the present invention;
FIG. 4 is a schematic diagram of an embodiment of the HMI transmitting data to the PLC according to the drawing control method of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Example 1
For the technical problem of slow communication speed of the conventional drawing control method, referring to fig. 2, fig. 2 is a flowchart of a method according to an embodiment of the drawing control method of the present invention; an embodiment 1 provides a drawing control method including:
generating a CAD drawing file: drawing a track by using drawing software and generating an original CAD drawing file;
CAD drawing file preprocessing: extracting effective information from an original CAD drawing file, and converting the effective information and preset PLC control parameters into a first CAD file with a specific data format;
HMI sending step: the HMI analyzes the first CAD file to obtain preset PLC control parameters and a path coordinate set, and sends the preset PLC control parameters and the path coordinate set to the PLC according to a specific HMI-PLC protocol;
drawing: the PLC controls the drawing motion mechanism to perform interpolation drawing according to preset PLC control parameters and a path coordinate set;
a feedback display step: and when the PLC controls the drawing motion mechanism to perform interpolation drawing, the current drawing coordinate is fed back to the HMI in real time to be displayed.
According to the drawing control method, drawing information of an original CAD drawing file can be simply and effectively transmitted to the HMI device through the first CAD file to be read and processed, data communication between the HMI device and the PLC device is achieved through a specific HMI-PLC data receiving and sending protocol, the correctness of data transmission is guaranteed, the data communication speed can be fast, the safety of data transmission is high, the drawing control method is easy to operate, and the practicability is high. In addition, the HMI and the PLC are combined to control the drawing movement mechanism to automatically draw by utilizing CAD data, and the drawing progress is monitored in real time, so that the production progress can be conveniently checked by workers.
The following describes the drawing control method specifically, referring to fig. 3, fig. 3 is a specific flowchart of an embodiment of the drawing control method according to the present invention:
s1, CAD drawing file generation: the dxf file is generated by drawing the control track by using CAD manufacturing software, specifically, an original CAD drawing file can be generated by using one of drawing software such as AutoCAD, CAXA, 3DMax and the like,
s2, preprocessing a CAD drawing file:
importing an original CAD drawing file into a PLC upper software client, extracting effective information of the original CAD drawing file by using the PLC upper software client, namely analyzing the original CAD drawing file to extract CAD coordinate data, and then obtaining a path coordinate set according to a path planning algorithm; the path coordinate set comprises the number of lines of a path graph, line types (line segments, arcs and splines), virtual solid lines and line coordinate data.
Then converting the path coordinate set and preset PLC control parameters to obtain a first CAD file, wherein the preset PLC control parameters comprise total byte number of the file, number of graphs, total byte number of the graphs, names of the graphs, serial numbers of a PLC control plane system, drawing speed, acceleration and deceleration and offset, and encrypting the path coordinate set and the preset PLC control parameters according to a specific data format to generate the first CAD file, and the file is defined as ssd type; one example of a program of a specific data format is as follows:
the data of the initial part of the program is used for the PLC, and the PLC can extract useful data from the data according to the requirement. The "solid line and dotted line" mean whether the straight line is added for assistance in the analysis process for completing the drawing of the graph or the straight line is included in the CAD drawing itself, and in the numerical control industry, the added straight line is referred to as "idle stroke". The CAD drawings are shown with solid lines and not with dashed lines. With the word "(none)" representing that the content is temporarily absent.
S3, HMI sending step:
the first CAD file is imported into the HMI through a U disk or a USB port, and the graph of the first CAD file can be previewed in the HMI, wherein in the embodiment, a display unit of the HMI is a touch screen, and a user can directly input a control command by using the display unit to control the work of the HMI and display information. A first CAD file list directory is generated on the left side of the HMI screen, and a screen window is provided on the right side of the screen for previewing a currently selected first CAD file. In addition, the HMI image is provided with a button of 'downloading to PLC', and the data (data refers to the preset PLC control parameters and the path coordinate set) of the selected file can be sent to the PLC by clicking the button of 'downloading to PLC'.
Specifically, the HMI is responsible for receiving a newly generated first CAD file, decrypting the first CAD file to obtain preset PLC control parameters and a path coordinate set, generating data frames from the preset PLC control parameters and the path coordinate set according to a specific HMI-PLC protocol, and transmitting data into the PLC through the serial port according to a specific transmission flow. The specification of the specific HMI-PLC protocol includes HMI start frame and PLC return frame formats, HMI data frame and PLC return frame formats, and HMI end frame and PLC return frame formats. Each frame comprises a specific function code, sending or returning data and CRC (cyclic redundancy check); for example, 0x83 is the start function code for the HMI to send data to the PLC; 0x84 is a data function code for HMI to send data to PLC; the format of each data frame is specifically as follows:
1. format of HMI start frame:
the return frame format of the PLC corresponding to the HMI initial frame is as follows:
2. format of HMI data frame:
the return frame format of the PLC corresponding to the HMI data frame:
3. HMI end frame format:
the return frame format of the PLC corresponding to the HMI end frame:
as shown in fig. 4, fig. 4 is a schematic diagram of a specific embodiment of the HMI for transmitting data to the PLC in the drawing control method of the present invention, the HMI sends preset PLC control parameters and a path coordinate set to the PLC through a specific sending flow, specifically: firstly, the HMI sends an HMI initial frame to the PLC, the PLC clears the extended Flash after receiving the HMI initial frame, prepares to download a graphic file (namely presetting PLC control parameters and a path coordinate set), and after the preparation is finished, the PLC returns to receive a correct frame. If the received frame is wrong and comprises frame length error, initial data sending error, CRC error and the like, the PLC returns the received frame is wrong. The HMI receives the error receiving frame returned by the PLC and retransmits the HMI initial frame, and if errors are returned for multiple times, the HMI prompts that the downloading is failed. The HMI sends HMI data frames with the frame number (data frame of the second packet), the PLC receives the frame only when the correct frame number and the correct data are received, and the error processing is the same as the HMI initial frame. When the reception of the HMI data frame is complete, the HMI may send an HMI end frame with a frame number of a particular value, representing an end, e.g., a frame number of 0xFFFF, representing an end.
S4, drawing:
the PLC sets working parameters of the PLC according to the received preset PLC control parameters; the PLC generates a final path coordinate set according to the received preset PLC control parameters, the path coordinate set and the interpolation algorithm to control the drawing motion mechanism to perform interpolation drawing, and specifically, the PLC obtains the final path coordinate set through primitive analysis and the interpolation algorithm according to the received path coordinate set and sends corresponding pulses to the drawing motion mechanism according to the final path coordinate set to control the drawing motion mechanism to complete CAD interpolation drawing. The PLC collects coordinates of interpolation points by adopting different interpolation algorithms according to the line types in the received path coordinate set, and interpolation errors are determined by drawing speed and acceleration and deceleration in preset PLC control parameters; and the interpolation process is completed in the burst send command.
S5, feedback display step:
when the PLC sends the pulse to control the drawing motion mechanism to draw the graph, the PLC sends the current drawing coordinate to the HMI to feed back coordinate information, so that the HMI draws the CAD simulation graph on the display picture of the HMI in real time and displays the drawing track in real time, and a user can know the drawing progress conveniently.
Example 2
the CAD drawing file generating unit is used for executing the CAD drawing file generating step, drawing tracks by using drawing software and generating an original CAD drawing file;
the CAD drawing file preprocessing unit is used for executing the CAD drawing file preprocessing step and converting the original CAD drawing file and the preset PLC control parameters into a first CAD file with a specific data format;
the HMI is used for executing the HMI sending step, analyzing by the HMI according to the first CAD file to obtain a preset PLC control parameter and a path coordinate set, and sending the preset PLC control parameter and the path coordinate set to the PLC according to a specific HMI-PLC protocol;
the drawing unit is used for executing the drawing step, and the PLC controls the drawing motion mechanism to perform interpolation drawing according to preset PLC control parameters and a path coordinate set; the PLC sets working parameters of the PLC according to preset PLC control parameters, and the PLC generates a final path coordinate set according to the preset PLC control parameters, the path coordinate set and an interpolation algorithm so as to control a drawing motion mechanism to perform interpolation drawing;
and the feedback display unit is used for executing a feedback display step, and the PLC controls the drawing motion mechanism to feed the current drawing coordinate back to the HMI to be displayed in real time when performing interpolation drawing.
Wherein, CAD drawing file preprocessing unit includes:
the CAD drawing file data extraction module is used for extracting file data according to an original CAD drawing file and planning a path to obtain a path coordinate set;
and the conversion module is used for converting the path coordinate set and the preset PLC control parameters to obtain a first CAD file.
The specific working process of the drawing control system refers to the description of embodiment 1, and is not described again.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A drawing control method, comprising:
CAD drawing file preprocessing: converting an original CAD drawing file and a preset PLC control parameter into a first CAD file with a specific data format;
HMI sending step: the HMI analyzes the first CAD file to obtain the preset PLC control parameter and the path coordinate set, and sends the preset PLC control parameter and the path coordinate set to the PLC according to a specific HMI-PLC protocol;
drawing: the PLC controls a drawing motion mechanism to perform interpolation drawing according to the preset PLC control parameters and the path coordinate set;
the CAD drawing file preprocessing step comprises the following steps:
and a CAD drawing file data extraction sub-step: extracting file data according to the original CAD drawing file and planning a path to obtain the path coordinate set;
a conversion substep: and converting the path coordinate set and the preset PLC control parameter to obtain the first CAD file.
2. The drawing control method according to claim 1, wherein the drawing step includes:
the PLC sets working parameters of the PLC according to the preset PLC control parameters;
and the PLC generates a final path coordinate set according to the preset PLC control parameter, the path coordinate set and an interpolation algorithm so as to control a drawing motion mechanism to perform interpolation drawing.
3. The drawing control method according to claim 2, wherein the preset PLC control parameter includes a total number of bytes of a file and/or a number of drawings and/or a total number of bytes of drawings and/or a name of a drawing and/or a PLC control plane system number and/or a drawing speed and/or an acceleration/deceleration and/or an offset.
4. The drawing control method according to any one of claims 1 to 3, wherein the path coordinate set includes a path figure line number and/or a line type and/or a dashed solid line and/or line coordinate data.
5. The drawing control method according to any one of claims 1 to 3, further comprising:
a feedback display step: and when the PLC controls the drawing motion mechanism to perform interpolation drawing, the current drawing coordinate is fed back to the HMI in real time to be displayed.
6. A graphics control system, comprising:
the CAD drawing file preprocessing unit is used for executing the CAD drawing file preprocessing step and converting the original CAD drawing file and the preset PLC control parameters into a first CAD file with a specific data format;
the HMI is used for executing an HMI sending step, and the HMI analyzes the preset PLC control parameters and the path coordinate set according to the first CAD file and sends the preset PLC control parameters and the path coordinate set to the PLC according to a specific HMI-PLC protocol;
the PLC controls the drawing motion mechanism to perform interpolation drawing according to the preset PLC control parameters and the path coordinate set;
the CAD drawing file preprocessing unit comprises:
the CAD drawing file data extraction module is used for extracting file data according to the original CAD drawing file and planning a path to obtain the path coordinate set;
and the conversion module is used for converting the path coordinate set and the preset PLC control parameter to obtain the first CAD file.
7. The drawing control system according to claim 6,
the PLC sets working parameters of the PLC according to the preset PLC control parameters;
and the PLC generates a final path coordinate set according to the preset PLC control parameter, the path coordinate set and an interpolation algorithm so as to control a drawing motion mechanism to perform interpolation drawing.
8. The drawing control system according to any one of claims 6 to 7, further comprising:
and the feedback display unit is used for executing a feedback display step, and the PLC controls the drawing motion mechanism to feed the current drawing coordinate back to the HMI in real time for display when performing interpolation drawing.
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