PID controller, parameter self-tuning extension module and implementation method thereof

Abstract

The invention discloses a PID controller, a parameter self-tuning extension module and an implementation method thereof. The PID controller and the parameter self-tuning extension module thereof comprise a temperature signal acquisition unit and a PID control and parameter self-tuning unit. The temperature signal acquisition unit is used for collecting temperature data of a controlled object and sending the temperature data to the PID control and parameter self-tuning unit. The PID control and parameter self-tuning unit is used for conducting parameter self-tuning according to the temperature data and outputting a tuning result to a main controller through an extension bus so that the parameter of the PID controller can be examined and / or modified conveniently through the main controller. Temperature measurement and PID control can be achieved on a PLC extended function module, user PLC program resources are saved, the self-tuning function is further achieved, hence, user parameter setting time is saved, parameter setting accuracy is improved, and therefore the control quality and robustness of the controller are guaranteed.

Description

technical field [0001] The invention relates to the field of PLC control system and industrial temperature control, in particular to a PID controller and its parameter self-tuning expansion module and its realization method. Background technique [0002] PLC (Programmable Logic Controller Programmable Logic Controller) is an electronic system for digital operations, designed for use in industrial environments. It uses a type of programmable memory for its internal storage program, execution of user-oriented instructions such as logic operations, sequence control, timing, counting and arithmetic operations, and controls various types of machinery through digital or analog input / output or production process. It is the core part of industrial control. [0003] PID (proportion, integral, derivative) controller has been the earliest practical controller for more than 70 years, and it is still the most widely used industrial controller. The PID controller is easy to understand ...

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a PID controller and its parameter self-tuning expansion module and its implementation method, aiming to solve the problem that the parameter setting of the PID controller of the existing industrial temperature PLC control system is manually controlled. Problems such as low efficiency and low accuracy caused by carrying out

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