CN105653333B - Programmable logic controller user program online modification system and method - Google Patents
Programmable logic controller user program online modification system and method Download PDFInfo
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Abstract
The invention provides a programmable logic controller user program online modification system and a method, wherein the system comprises a downloading unit, an effect unit and an exit unit which are positioned on a programmable logic controller, wherein: the downloading unit is used for storing the configuration information from the upper computer into an online modified data storage area of the programmable logic controller; the validation unit is used for modifying the program of the current program area according to the configuration information of the online modified data storage area and synchronously modifying the data of the current data area; and the exit unit is used for exiting the online modification operation and synchronizing the program of the current program area and the data of the current data area to the backup program area and the backup data area of the programmable logic controller respectively. According to the invention, the configuration information is independently stored, and the current program area and the current data area are modified according to the configuration information, so that the user program can be updated on line without switching the operation area back and forth for multiple times, and the real-time performance is better.
Description
Technical Field
The invention relates to the field of programmable logic controllers, in particular to a system and a method for online modifying a user program of a programmable logic controller.
Background
With the expansion of the application field of PLC (programmable logic controller), the continuous enrichment of peripheral devices related to PLC, and the progress of industrial automation control technology, the capacity and program complexity of PLC user programs are continuously increasing. It is difficult for the user to complete all the related operations of the program in one step, such as checking whether the user program is written correctly, whether the operation is reliable and stable, whether the logical relationship complies with the requirements, and the like.
In addition, in the use process of the PLC, due to changes in environment or requirements, the user program often needs to be changed, and meanwhile, the requirement of continuity of operation is also met, that is, the user program of the PLC needs to be changed and the control logic needs to be adjusted in a state that the PLC is not shut down.
In order to improve the usability and the debugging performance of a PLC product and realize the modification of a user program in the running process of the PLC, part of manufacturers develop a PLC program online modification function to help a user to modify the user program in the using process.
The existing PLC online modification function scheme is as follows:
(1) the user program is modified directly. In the PLC operation, after receiving a new user program, inserting or changing the new user program into the original user program in the idle period of program operation, and simultaneously modifying the process variable data corresponding to the user program. In the scheme, however, in the operation process of the program area, the change of the program needs to monopolize the program area, which has an influence on the real-time performance of the control; moreover, if the user program is modified incorrectly, and the user program has been modified, an exception is directly caused.
(2) And directly modifying the program backup area and the data backup area, and synchronizing the current program area and the current data area after the modification is successful (when the online modification is carried out, the new program and the new data are stored in the program backup area and the data backup area). And after the modification is successful, switching the current program area and the data area to the program backup area and the data backup area to execute in an idle period, marking the current program area and the data area as a current execution unit, and marking the original program area and the original data area as a backup unit. However, in this scheme, program adjustment is generally difficult to be performed in one step, continuous adjustment needs to be performed for many times, and the controller needs to switch the current execution area and the backup area back and forth during the modification process; in addition, the program area and the data area are backed up, and more system resources are needed.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a new system and method for online modification of a user program of a programmable logic controller, aiming at the problems that the control real-time performance is affected and the current execution area and the backup area are repeatedly switched when the user program of the programmable logic controller is online modified.
The technical solution for solving the above technical problems is to provide an online modification system for a user program of a programmable logic controller, where the programmable logic controller executes a program in a current program area and accesses operating data using a current data area when operating, and the programmable logic controller further includes a backup program area and a backup data area; the system comprises a downloading unit, an effect unit and an exit unit which are positioned on a programmable logic controller, wherein: the downloading unit is used for storing configuration information from an upper computer into an online modification data storage area of the programmable logic controller after online modification operation is started, and the configuration information comprises a new program; the validation unit is used for modifying the program of the current program area according to the configuration information of the online modified data storage area and synchronously modifying the data of the current data area when the scanning period is finished or the idle running period is run; and the exit unit is used for exiting the online modification operation and synchronizing the program of the current program area and the data of the current data area to the backup program area and the backup data area of the programmable logic controller respectively.
In the online modification system for the user program of the programmable logic controller, the system further comprises a compiling unit positioned on the upper computer, and the compiling unit is used for compiling and generating configuration information.
In the online modification system of the user program of the programmable logic controller, the programmable logic controller further comprises a starting unit and an uploading unit, and the system further comprises a judging unit and a sending unit which are positioned on the upper computer, wherein:
the starting unit is used for enabling the programmable logic controller to start online modification operation when receiving an online modification starting signal of the upper computer;
the uploading unit is used for uploading the program of the current program area to the upper computer after the programmable logic controller starts the online modification operation;
the judging unit is used for judging whether the program uploaded by the programmable logic controller is matched with the program to be modified;
and the issuing unit is used for sending the configuration information to the programmable logic controller when the judging unit confirms the matching, so that the configuration information is stored in the online modified data storage area by a downloading unit of the programmable logic controller.
In the online modification system of the user program of the programmable logic controller, when the configuration information stored in the downloading unit is abnormal, the programmable logic controller exits the online modification operation.
In the online modification system for the user program of the programmable logic controller, the programmable logic controller further comprises a recovery unit, which is used for covering the program of the backup program area with the program of the current program area and synchronously modifying the data of the current data area when the program of the current program area after the programmable logic controller executes modification has an error.
The invention also provides a programmable logic controller user program online modification method, the programmable logic controller executes the program of the current program area and uses the current data area to access the running data when running, the programmable logic controller also comprises a backup program area and a backup data area; the method comprises the following steps:
(a) after the online modification operation is started, the programmable logic controller receives configuration information from an upper computer and stores the configuration information into an online modification data storage area of the programmable logic controller, wherein the configuration information comprises a new program;
(b) when the scanning period is finished or the idle running period is in operation, the programmable logic controller modifies the program of the current program area according to the configuration information of the modified data storage area and synchronously modifies the data of the current data area;
(c) when the online modification operation is quitted, the programmable logic controller respectively synchronizes the program of the current program area and the data of the current data area to the backup program area and the backup data area of the programmable logic controller.
In the online modification method for the user program of the programmable logic controller, the configuration information is compiled and generated by an upper computer.
In the method for online modifying a user program of a programmable logic controller according to the present invention, the step (a) includes:
(a1) the programmable logic controller starts online modification operation when receiving an online modification starting signal of the upper computer;
(a2) the programmable logic controller uploads the program of the current program area to the upper computer;
(a3) and when the upper computer confirms that the program uploaded by the programmable logic controller is matched with the program to be modified, the upper computer sends the configuration information to the programmable logic controller and stores the configuration information in the online modified data storage area by the programmable logic controller.
In the method for online modifying a user program of a programmable logic controller according to the present invention, the step (a) includes: and the programmable logic controller exits the online modification operation when the configuration information is stored abnormally.
In the method for online modifying a user program of a programmable logic controller according to the present invention, the step (b) includes: and when the program of the current program area after the modification is executed has an error, the programmable logic controller enables the program of the backup program area to cover the program of the current program area and synchronously modifies the data of the current data area.
According to the system and the method for the online modification of the user program of the programmable logic controller, the configuration information is stored independently, the current program area and the current data area are modified according to the configuration information, the online update of the user program can be completed without switching the operation area back and forth for multiple times, and the real-time performance is good.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a programmable logic controller user program online modification system of the present invention.
FIG. 2 is a flow chart of an embodiment of the method for online modification of the user program of the programmable logic controller according to the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, which is a schematic diagram of an embodiment of the system for online modifying a user program of a programmable logic controller according to the present invention, the programmable logic controller 20 executes a program in a current program area and accesses operating data using a current data area when operating, and the programmable logic controller 20 further includes a backup program area and a backup data area. The system for online modification of the user program of the programmable logic controller in this embodiment includes a downloading unit 21, an effecting unit 22, and an exiting unit 24 located in the programmable logic controller 20, where the downloading unit 21, the effecting unit 22, and the exiting unit 24 may be formed by combining software running in the programmable logic controller 20.
The downloading unit 21 is used for storing the configuration information from the upper computer 10 into an online modification data storage area 23 of the programmable logic controller after the online modification operation is started. The configuration information may be generated by a compiling unit of the upper computer 10 according to a code input by a user, and specifically may include a position of a program to be modified, a length to be modified, a new program, a length of the new program, and the like. The online modified data storage area 23 is a logical storage space in the plc independent of the current program area, the current data area, the backup program area, and the backup data area.
In particular, when the configuration information stored in the download unit 21 is abnormal, the programmable logic controller 20 exits the online modification operation. Therefore, when the transmission of the configuration information between the upper computer 10 and the programmable logic controller 20 is wrong, the online modification operation of the user program can be stopped in time.
The validation unit 22 is configured to modify the program in the current program area according to the configuration information of the online modification data storage area 23 at the end of the scanning cycle or during the idle running period, and synchronously modify data (specifically, data such as a program pointer and a running process variable) in the current data area, so that the current online modification is validated.
The exit unit 24 is used for exiting the online modification operation and synchronizing the program in the current program area and the data in the current data area to the backup program area and the backup data area of the programmable logic controller 20, respectively. Specifically, the exit unit 24 exits the online modification operation upon receiving an exit online modification instruction from the upper computer 10.
Before the upper computer 10 sends out the instruction of online modification quitting, the downloading unit 21 and the validation unit 22 can acquire the configuration information from the upper computer 10 for many times, and perform online modification for many times according to the configuration information. Moreover, the plc 20 and the upper computer 10 in the background can communicate in different ways, including but not limited to serial port, USB, ethernet, etc.
The online modification system for the user program of the programmable logic controller can directly face an application field, the program which is successfully debugged can be directly used for production operation, the re-debugging is not needed, the modification and the adjustment of the user program in the operation of the programmable logic controller are successfully realized, and the online modification system is simple and easy to implement. And the system can solve the real-time problem well by downloading the configuration information to the online modification data storage area 23. The online modification times are not limited, and the execution area does not need to be switched back and forth for many times, so that the system resources are saved.
The programmable logic controller 20 may further include a starting unit, an uploading unit, and correspondingly, the upper computer 10 may include a judging unit and a sending unit, which may also be implemented in combination with software.
The starting unit is used for enabling the programmable logic controller 20 to start the online modification operation when receiving an online modification starting signal of the upper computer 10. After the programmable logic controller 20 starts the re-modification operation, the upload unit uploads the program of the current program area to the upper computer 10. After receiving the uploaded program, the determining unit of the upper computer 10 determines whether the uploaded program matches the program to be modified, and if not, reports an error and causes the programmable logic controller 20 to exit the online modification operation. If the judging unit confirms that the uploaded program is matched with the program to be modified, the issuing unit sends the configuration information generated by compiling by the compiling unit to the programmable logic controller 20, so that the configuration information is stored in the online modified data storage area 23 by the downloading unit 21 of the programmable logic controller 20.
The uploaded new program can be ensured to be consistent with the program to be modified through the starting unit, the uploading unit, the judging unit and the issuing unit. In practical applications, the upper computer 10 may also determine whether the program to be modified matches the program currently being executed by the programmable logic controller 20 by checking the program data of the programmable logic controller 20.
The programmable logic controller 20 may further include a recovery unit, configured to, when the modified program in the current program area executed by the programmable logic controller 20 has an error, overwrite the program in the backup program area with the program in the current program area, and modify the data in the current data area synchronously. That is, when an error occurs in the program execution process during or after the program being modified online, the program in the current program area may be overwritten by the program in the backup program area (the program is the program modified online), and the data such as the program pointer and the operating process variable in the online data area may be modified synchronously, and then the error may be reported to make the programmable logic controller 20 exit the online modification operation.
Through the recovery unit, even if the online modification fails, the programmable logic controller 20 can be switched to the original program to continue to operate, so that the risk of online modification of the user program is reduced.
Fig. 2 is a schematic flow chart of an embodiment of a method for online modifying a user program of a programmable logic controller according to the present invention, where the programmable logic controller executes a program in a current program area and accesses operating data using a current data area when operating, and the programmable logic controller further includes a backup program area and a backup data area; the method comprises the following steps:
step S31: after the on-line modification operation is started, the programmable logic controller receives configuration information (compiled and generated by the upper computer) from the upper computer and stores the configuration information into an on-line modification data storage area of the programmable logic controller, wherein the configuration information comprises a new program. And if the configuration information is stored abnormally (or is transmitted abnormally), the programmable logic controller exits the online modification operation.
In the step, the programmable logic controller starts online modification operation when receiving an online modification starting signal of the upper computer; then the programmable logic controller uploads the program of the current program area to an upper computer; and when the upper computer confirms that the program uploaded by the programmable logic controller is matched with the program to be modified, the upper computer sends the configuration information to the programmable logic controller and stores the configuration information in an online modified data storage area of the programmable logic controller.
Step S32: and at the end of the scanning period or the idle running period, the programmable logic controller modifies the program of the current program area according to the configuration information of the modified data storage area and synchronously modifies the data of the current data area.
In this step, if the program in the current program area after the programmable logic controller executes modification (i.e. the program after online modification) is faulty, the original program in the backup program area is overwritten on the current program area, and data such as a program pointer, an operating process variable and the like in the current data area are modified. Therefore, even if the online modification of the user program is wrong, the operation of the programmable logic controller is not influenced.
Step S33: when the online modification operation is quitted, the programmable logic controller respectively synchronizes the program of the current program area and the data of the current data area to the backup program area and the backup data area of the programmable logic controller.
Before the above step S33, the steps S31 and S32 may be executed multiple times to perform multiple online user program modifications.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A programmable logic controller user program online modification system, the said programmable logic controller carries out the procedure of the present program area and uses the present data area to access the running data while running, the programmable logic controller also includes backup program area and backup data area; the method is characterized in that: the system comprises a downloading unit, an effect unit and an exit unit which are positioned on a programmable logic controller, wherein: the downloading unit is used for storing configuration information from the upper computer into an online modification data storage area of the programmable logic controller after online modification operation is started, and the configuration information comprises a new program and the position of the program to be modified; the validation unit is used for modifying the program of the current program area according to the configuration information of the online modified data storage area and synchronously modifying the data of the current data area when the scanning period is finished or the idle running period is run; the exit unit is used for exiting the online modification operation according to an exit online modification instruction of the upper computer, synchronizing the program of the current program area and the data of the current data area to the backup program area and the backup data area of the programmable logic controller respectively, and before the upper computer sends the exit online modification instruction, the downloading unit and the validation unit acquire configuration information from the upper computer for many times and perform online modification for many times according to the configuration information.
2. The programmable logic controller user program online modification system of claim 1, further comprising a compiling unit located on the upper computer, the compiling unit being configured to compile the generated configuration information.
3. The programmable logic controller user program online modification system of claim 1, wherein: the programmable logic controller also comprises a starting unit and an uploading unit, the system also comprises a judging unit and a sending unit which are positioned on the upper computer, wherein:
the starting unit is used for enabling the programmable logic controller to start online modification operation when receiving an online modification starting signal of the upper computer;
the uploading unit is used for uploading the program of the current program area to the upper computer after the programmable logic controller starts the online modification operation;
the judging unit is used for judging whether the program uploaded by the programmable logic controller is matched with the program to be modified;
and the issuing unit is used for sending the configuration information to the programmable logic controller when the judging unit confirms the matching, so that the configuration information is stored in the online modified data storage area by a downloading unit of the programmable logic controller.
4. The programmable logic controller user program online modification system of claim 1, wherein: and when the configuration information stored in the downloading unit is abnormal, the programmable logic controller exits the online modification operation.
5. The programmable logic controller user program online modification system of claim 1, wherein: the programmable logic controller also comprises a recovery unit which is used for covering the program of the backup program area with the program of the current program area and synchronously modifying the data of the current data area when the program of the current program area after the programmable logic controller executes modification has an error.
6. A programmable logic controller user program online modification method, the said programmable logic controller carries out the procedure of the present program area and uses the present data area to access the running data while running, the programmable logic controller also includes backup program area and backup data area; the method is characterized in that: the method comprises the following steps:
(a) after the online modification operation is started, the programmable logic controller receives configuration information from an upper computer and stores the configuration information into an online modification data storage area of the programmable logic controller, wherein the configuration information comprises a new program and the position of the program to be modified;
(b) when the scanning period is finished or the idle running period is in operation, the programmable logic controller modifies the program of the current program area according to the configuration information of the modified data storage area and synchronously modifies the data of the current data area;
(c) when the online modification operation is quitted according to the quitting online modification instruction of the upper computer, the programmable logic controller respectively synchronizes the program of the current program area and the data of the current data area to a backup program area and a backup data area of the programmable logic controller;
before step (c), steps (a) and (b) are executed for a plurality of times to perform a plurality of online user program modifications.
7. The programmable logic controller user program online modification method of claim 6, wherein: the configuration information is compiled and generated by an upper computer.
8. The programmable logic controller user program online modification method of claim 6, wherein: the step (a) includes:
(a1) the programmable logic controller starts online modification operation when receiving an online modification starting signal of the upper computer;
(a2) the programmable logic controller uploads the program of the current program area to the upper computer;
(a3) and when the upper computer confirms that the program uploaded by the programmable logic controller is matched with the program to be modified, the upper computer sends the configuration information to the programmable logic controller and stores the configuration information in the online modified data storage area by the programmable logic controller.
9. The programmable logic controller user program online modification method of claim 6, wherein: the step (a) includes: and the programmable logic controller exits the online modification operation when the configuration information is stored abnormally.
10. The programmable logic controller user program online modification method of claim 6, wherein: the step (b) comprises: and when the program of the current program area after the modification is executed has an error, the programmable logic controller enables the program of the backup program area to cover the program of the current program area and synchronously modifies the data of the current data area.
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| CN102968089A (en) * | 2012-10-23 | 2013-03-13 | 深圳市汇川控制技术有限公司 | Programmable logic controller and implementing method |
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| CN102945179B (en) * | 2012-11-28 | 2016-06-29 | 青岛海信宽带多媒体技术有限公司 | Method for upgrading software and device based on MTD subregion |
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| CN202632043U (en) * | 2012-04-25 | 2012-12-26 | 山东省计算中心 | Online programmable controller |
| CN102968089A (en) * | 2012-10-23 | 2013-03-13 | 深圳市汇川控制技术有限公司 | Programmable logic controller and implementing method |
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Effective date of registration: 20221212 Address after: 518000 Huichuan technology headquarters building, Guanlan high tech Industrial Park, Longhua New District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN INOVANCE TECHNOLOGY Co.,Ltd. Address before: 518000 room 306, 3rd floor, building 16, Shangsha innovation and Technology Park, Binhe Road, Futian District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Inovance Control Technology Co.,Ltd. |