A method for online modification of control system logic algorithm program

Abstract

The invention discloses a method for amending the logic algorithm routine of a control system in an online mode. The control system comprises two major parts of configuration software and a controller; the configuration software is in charge of generating an algorithm routine, and the controller is in charge of executing the routine to finish the industrial control. The method comprises four stages of (1), a data generating stage: the configuration software generates the necessary data information for the online amending in an offline mode; (2) a data downloading stage: the configuration software downloads the generated data and the controller preserves the data into a corresponding storing area; (3) a routine configuration stage: the controller finishes the routine configuration in the idle time of executing the algorithm routine; (4) a routine switching stage: the old algorithm routine is stopped and a new algorithm routine is executed. The control system can still correctly execute the algorithm routine before the amending even if any stage has a fault. The algorithm routine can be amended in the online mode without influencing the on-going routine, and the original control routine can still be executed under the condition of failure amending.

Description

technical field [0001] The invention belongs to the technical field of industrial automation control systems, and more specifically relates to a method for online modification of a logic algorithm program of a control system. Background technique [0002] In industrial automation control, the control system composed of configuration software and controller (also known as upper computer and lower computer) is widely used in various control fields: such as distributed control system (DCS), programmable logic controller (PLC) ), safety instrumented control system (SIS), etc. Usually, the configuration software (upper computer) completes the configuration of the control algorithm, the generation of the algorithm program, the download of the algorithm program to the controller, and the online monitoring of the algorithm execution; the controller (the lower computer) completes the algorithm task scheduling, control Algorithm execution, on-site data acquisition and other work are ...

AI Technical Summary

Problems solved by technology

[0004] The first way is that the storage area of ​​the controller adopts a code area and a data area. Each sub-algorithm program in the algorithm program is stored in a designated area, and the newly added subroutine is stored in a new area. The subroutine can be replaced after the execution of the task is stopped, or it can be replaced during the execution process, but the replaced subroutine cannot be executed. This method has a great impact on the real-time performance of the control;

[0005] The second method is that two code areas are used in the storage area of ​​the controller, and the two code areas share one data area. This method can configure the other code area without affecting the running program to meet the control requirements. Real-time requirements, but its disadvantage is that the memory space of the original variables may be required to be initialized after the program is modified. If an exception occurs after this stage is executed, the system cannot return to the original algorithm program running state, and there is a risk of algorithm disturbance. The same problem exists in one way

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