Who can teach me how to learn SCM, what to learn first and how to get started?

 

1. If you just watch videos on the Internet , And supporting teaching materials , so to speak , Never learn . I have a set of free and not boring novice textbooks here （ I will send messages in the comment area in order ）, Take a look in your spare time , Can you insist that we talk about the following after reading .
2. Why does the study of single chip microcomputer need us to practice , Just look at the training materials , Maybe you can understand something when you read it , But after a few days , Will be completely forgotten .

3) Learn SCM technology , Hands on ability is very important .

Be sure to build a suitable test site for yourself , Combined with specific practical objects , It is easy to understand the circuit configuration principle of single chip microcomputer °, Understand the programming principle of single chip microcomputer .

Suggest ： Give yourself a topic of home intelligence , Single chip microcomputer is used as the main control unit , Build a satisfactory intelligent effect for your home . Learning through practice , It's more useful than reading online videos a hundred times .

 

Tell me something about learning SCM by myself .

I read SCM in school , I have also done experiments , But these are like passing clouds , After the final exam , I almost forgot .

After entering the workplace , As a result of technological innovation , Need their own SCM control device . So I purchased a single-chip computer , I have made a single-chip microcomputer and a front and back channel circuit board , And peripheral circuits °. It is equipped with procedures , Thoroughly understand the principle and practice of the single chip microcomputer . When I see that the system I designed works perfectly , Very happy. !

How good the conditions are now ! We can buy SCM learning machine online , You can have whatever you want . Compared with us then , The current level of material abundance is completely incomparable . However, it is this abundance of materials that limits our practical ability . This point , The topic should be fully understood .

in addition , At that time, I solved a small problem incidentally : Because the upper computer of the single chip microcomputer control device is PLC,PLC Only floating point numbers are accepted , Therefore, it also makes industrial control data conversion in the single chip microcomputer system 、 And four arithmetic operations of floating point numbers . At that time, the performance of single chip microcomputer was weak , I thought about it 2 Genius can be realized .

Experience is : SCM technology and PLC The technology is the same , Very practical . Only practical operation , So that we can fully understand .

 

Finally, let me give you a question :

The single chip microcomputer system designed in the campus is compared with the single chip microcomputer system designed under the actual industrial control environment , What is the essential difference ?

See from the comments section , Some say it is reliable , There is talk of power consumption 、 Cost and stability , And software redundancy . So what is the answer ?

We all know PLC, Its essence is actually a single-chip microcomputer system .PLC The stability of 、 Very reliable , Used in industrial environment , Generally, no problem will occur .

why PLC Can have such high stability and reliability ? This is related to many of its design and performance .

 

In an industrial environment , Electromagnetic interference is very strong . Ordinary single chip microcomputer system ( The board ） Working in this environment , Scrapped almost immediately . I did a test , The single board computer sold in the market was used ( It's not a single chip , It is CPU+PIO+CTC And other modules to form a full-featured circuit board ） Directly placed in the distribution box for control , When the contactor is disconnected , The high voltage generated by a slight electric arc breaks down the power supply of the single board computer , Then there was a fire .

Later we made our own circuit board , Many improvements have been made in the power supply , The input part is also isolated by optocoupler , The stability of the system has been improved a lot . But one day , Something's wrong . Consult an expert , Just know this is called EMC Electromagnetic disturbance .

EMC Electromagnetic disturbance consists of two parts , One is the resistance of the machine to external electromagnetic impact , The second is the electromagnetic disturbance caused by the machine to the outside world . The single board computer we started to use , It is because they can not resist the external electromagnetic disturbance that the problem arises .

After knowing the reason , We specialize in purchasing EMC Tester and operating platform , Any electronic circuit we develop °, Before putting into operation, you must go through EMC Test of , It can only be used on the equipment site after passing .

This is only the hardware part , For Software , I studied it carefully PLC Assembly language of , Find out why it adopts non - circular line by line statements , In fact, it is to improve reliability .

After understanding this truth , Our final control center , Of course, it is sold on the market PLC Products . Of course , We are right. PLC Also done screening . We use it EMC The test bench is right PLC Send out strong group pulses , The grade is industrial grade IV , ordinary PLC Also damaged , Only a few PLC The product can resist this EMC The impact of a group of pulses .

thus it can be seen ,EMC The test is an electronic circuit ° The most important application condition of .

Electronic products designed on campus , even EMC There's nothing on the side of the , How can it be applied in the industrial environment ?

 

That's the answer .