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
Set the system speed error coefficient to 10, with a gain margin greater than 10 dB and a phase margin greater than 50 degrees. % Lead-lag compensation numeratornum1=10*1;% Expected speed error coefficientden1=conv(conv([1,0],[0.4,1]),[1.2,1]);% Denominator polynomial[Gn1,Ph1,Wg1,Wp1]=margin(num1,den1);% Frequency variablew1=logspace(-2,2,1000);% Frequency response[mag1,pha1]=bode(num1,den1,w1);k1=find(abs(w1-Wg1)==min(abs(w1-Wg1)));Wc=Wg1;w_c2=Wc/12;beta=15;num_c2=[1/w_c2,1];den_c2=[beta/w_c2,1];w_c1=w_c2;mag_k=mag1;mag_k(k1)=2;i1=1;while(mag_k(k1)>1) num_c1=[1/w_c1,1]; den_c1=[1/(w_c1*beta),1]; w_c1=w_c1+0.01; [num_c,den_c]=series(num_c1,den_c1,num_c2,den_c2); [num2,den2]=series(num1,den1,num_c,den_c); [mag_k,pha_k]=bode(num2,den2,w1); i1=i1+1; if(i1>9000) break; endend[Gn2,Ph2,Wg2,Wp2]=margin(num2,den2);% Frequency response[mag2,pha2]=bode(num2,den2,w1);[mag_c,pha_c]=bode(num_c,den_c,w1);subplot(2,1,1);semilogx(w1,20*log10(mag1),’b’,w1,20*log10(mag2),’r’,w1,20*log10(mag_c),’g’);grid;ylabel(‘Magnitude (dB)’);title(‘Blue line – Before compensation, … Read more
Entering a modern factory, we can see various devices operating automatically: robotic arms precisely grabbing items, conveyor belts orderly transporting parts, and indicator lights flashing status information. Behind all this efficient operation lies a core control device – the PLC. Many people find terms like “PLC” and “industrial automation” very complex, thinking they are advanced … Read more
Using the series lag compensation method, the system speed error is set to 5, with a phase margin greater than 50 degrees and a gain margin greater than 10 dB. %chuanlianzhihoujiaozhengnum1=5*1;%expected speed error xishuden1=conv(conv([1,0],[0.2,1]),[0.8,1]);%denominator polynomial [Gn1,Ph1,Wg1,Wp1]=margin(num1,den1);%desired phase margin PH_1=50;%expected gain margin GN_1=10;%expected value w1=logspace(-3,1,1000);%frequency variable [mag1,pha1]=bode(num1,den1,w1);for ang1=5:1:15%angle offset ph_i=PH_1+ang1-180 ; [min1,id1]=min(abs(pha1-ph_i)) ;%cross frequency w_c1=w1(id1) ; … Read more
1. Introduction A PLC (Programmable Logic Controller) is a core device in modern industrial automation control, widely used in manufacturing, energy, transportation, and other fields. It achieves automated control of machinery through programming, offering high reliability, flexibility, and ease of maintenance. The core of a PLC lies in its logical control capabilities, which can perform … Read more
Hello everyone! Today, I bring you two PLC control cases that are very suitable for beginners in electrical automation, helping you quickly grasp basic programming logic. Remember to bookmark and share this with your classmates to progress together! 💡 01Sequential Start and Stop 📌 Application Scenario: In industrial ventilation systems, multiple fans often need to … Read more
Click the blue text above to follow us~ If you want to know more, feel free to ask me! I have been in the automation field for half a year, earning about 80,000 to 90,000 yuan while working away from home. I send some money home each month and have saved quite a bit. Now … Read more
Imagine an automated factory: conveyor belts operating precisely, robotic arms moving freely, production lines running 24/7… Who is giving the orders behind this orderly operation? Is it a group of engineers frantically operating computers in the background? No! The true conductor is a metal box called PLC. It is the “strongest brain” in the field … Read more
Low water levels in factory production water tanks can affect normal production, while high levels can lead to overflow accidents. Therefore, it is necessary to monitor the water level in the factory water tank in real-time and automatically issue an alarm when the water level is abnormal. The specific requirements for the water level monitoring … Read more
MitsubishiFXSeriesPLCData Types and Array Types Explained 1. Introduction TheMitsubishiFXSeriesPLCis a widely used programmable logic controller in the field of industrial automation. In its programming, the proper use of data types and arrays is crucial for the structure and efficiency of the program. This article will provide a detailed introduction to the basic and complex data … Read more