To cancel the controllable poles and zeros of the control system and eliminate unnecessary states, the minreal() function can be used for this processing. % System minimal realization % minreal() % ss2tf() %%%%%%%%%%% clear all; clc; close all; %%%%%%%%%%%%% %%%% Example 1 A1=[-3.9 -1.303 0 0 1.304 0 0 0 1.0 2.608 -11.22 -5.503 0 … Read more
Classification of PLCs PLC (Programmable Logic Controller) can be classified in various ways, primarily based on its hardware structure, I/O point count, and functional range. This is similar to classifying cars by structure (sedan, SUV), size (compact, mid-size), or performance (family, performance). The following are the most common and important classification methods for PLCs: 1. … Read more
The Emergence, Definition, and Core Characteristics of PLCs PLC (Programmable Logic Controller) is the “brain” of industrial automation, born from the innovation of traditional control technologies. Its core value lies in using the “flexibility of software” to address the “complexity of control” in industrial scenarios. It remains the core control device for production lines, machine … Read more
Linear matrix inequalities are a core tool in control systems, optimization, and many engineering fields. 1. What is a Linear Matrix Inequality? Linear matrix inequality refers to inequalities of the following form: Where: is the decision variable (a vector) we need to solve for. is a given symmetric matrix. indicates that the matrix is negative … Read more
In the control of urban centralized heating systems, particularly in boiler operations at heat source plants and control at heat exchange stations, we commonly encounter control methods such as PLC, DCS, and SCADA. However, based on my understanding, I believe that most operational and management personnel in heating companies do not fully grasp the true … Read more
What is a PLC? How is it Smarter than a Relay? —— An explanation from an electrical teacher who has worked with Siemens S7-300 for ten years When I was a child, my father, who worked in electric welding, once told me: “Relays are not useless; you just have to keep an eye on them.” … Read more
The Development of PLC: From Relays to Intelligent Controllers ——A lecture by an electrician teacher who transitioned from a “traditional electrical worker to an automation expert” When it comes to PLCs, they are now the “intelligent controllers” that everyone in factories is clamoring for. However, if you really ask how they came to be and … Read more
First, obtain the closed-loop function of the system from the open-loop function, and expand this function into a Taylor series with respect to the variable s. The constant coefficients c0, c1, c2, etc., in the series are the dynamic error coefficients. Typically, c0 is referred to as the dynamic position error coefficient, c1 as the … Read more
Choosing between a Programmable Logic Controller (PLC) and a Distributed Control System (DCS) requires a specific analysis based on the situation, as different applications have varying requirements for control systems. When communicating with clients, we can approach the discussion from the following aspects! PLC and DCSPLC 1. Development from switch control to sequential control, transport … Read more
Introduction As an industrial control computer, PLCs have a modular structure, flexible configuration, high processing speed, and precise data processing capabilities. PLCs also have good control capabilities for stepper motors, utilizing their high-speed pulse output function or motion control function to achieve control over stepper motors. For specific devices where both the distance and speed … Read more