Programmable logic controller user program online modification system and method
A programming logic and user program technology, applied in the direction of instrumentation, software engineering design, calculation, etc., can solve problems affecting real-time performance and achieve good real-time performance
Active Publication Date: 2020-04-14
SHENZHEN INOVANCE TECH
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Problems solved by technology
[0008] The technical problem to be solved by the present invention is to provide a new programmable logic controller for the above-mentioned problem that the online modification of the user program of the programmable logic controller affects the real-time performance of the control and repeatedly switches the current execution area and the backup area. System and method for online modification of user program
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[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0033] Such as figure 1 As shown, it is a schematic diagram of an embodiment of the online modification system of the programmable logic controller user program of the present invention. The above-mentioned programmable logic controller 20 executes the program in the current program area and uses the current data area to access the running data during operation. The logic controller 20 also includes a backup program area and a backup data area. In this embodiment, the PLC user program online modification system includes a download unit 21, a validation unit 22, and an exit unit 24 located in the p...
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The invention provides a programmable logic controller user program online modifying system and a programmable logic controller user program online modifying method; the system comprises a downloading unit, an effecting unit and an exiting unit, wherein the downloading unit, the effecting unit and the exiting unit are positioned in a programmable logic controller; the downloading unit is used for storing configuration information from an upper computer to an online modification data storage area of the programmable logic controller; the effecting unit is used for modifying a program of a current program area according to the configuration information of the online modification data storage area, and synchronously modifying the data of the current data area; and the exiting unit is used for exiting an online modifying operation, and respectively synchronizing 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. According to the system and the method disclosed by the invention, by storing the configuration information separately, and modifying the current program area and the current data area according to the configuration information, the user program online update can be finished without switching an operating area back and forth for multiple times; and the real-time performance is relatively good.
Description
technical field [0001] The invention relates to the field of programmable logic controllers, in particular to a system and method for online modification of user programs of programmable logic controllers. Background technique [0002] With the expansion of PLC (programmable logic controller) application fields, the continuous enrichment of related peripheral equipment and the advancement of industrial automation control technology, the capacity and program complexity of PLC user programs continue to increase. It is difficult for users to complete all program-related operations in one step, such as checking whether the user program is written correctly, whether the operation is reliable and stable, and whether the logical relationship follows the requirements, etc. [0003] In addition, during the use of PLC, due to changes in the environment or requirements, it is often necessary to change the user program, and at the same time there is a requirement for continuity of opera...
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IPC IPC(8): G06F8/654
CPCG06F8/654
Inventor 孟国军
Owner SHENZHEN INOVANCE TECH