What is the difference between PLC and single-chip computer? How to distinguish between PLC and single-chip microcomputer -

PLC, the actual is microcontroller running, it is only the basis of based on single chip microcomputer, developed a second application of industrial logic controller, convenient user with the electrician thinking to use, so PLC microcontroller is the biggest advantage of simple and easy to use. Since PLC is based on single chip microcomputer to develop, PLC all functions, single chip microcomputer can certainly do it, such as some timing, counting, interruption, analogue processing, communication, logic control, the single chip microcomputer can be realized, and much faster than a PLC on the response speed, precision will be higher than PLC.

PLC hardware circuit, the general power grid will take into account the industry pollution, did a lot of design on voltage filter. Input and output circuit, also tend to use optical coupling isolation, circuit component selection are strict with the industrial level, the circuit board wiring will also consider the interference problems, such as PCB board will add coating protection. And single chip microcomputer, often from the perspective of commercial civil to selection and design of high reliability without PLC, electronic components is not as strict as industrial choice, the overall reliability of the PLC controller. For industrial sites, product stability, reliability and durability, it is very important, industrial equipment, after all, the more valuable, need to 24 hours of continuous electric operation for a long time, many will work continuously for more than ten years.

PLC easy to learn and easy to use

microcontroller too troublesome, first of all, have a certain foundation of electronic circuit, software and hardware were often apart, but you have to write software, usually also want to know something hardware, this is for general engineering staff, is more laborious, after all, electric and electronic still has certain gap. If in a kind of industrial equipment to develop a MCU, not three days two head can make good, involves the selection and adjustment, stable really need a period of time.

microcontroller early use of assembly language, although progress now, basically can use the C programming language, but C is process oriented language, the average person learning time also is not very good grasp of. Even if you have mastered a microcontroller programming, in a, learning together is still take the time, after all the details of the things a lot.

and PLC controller ladder diagram programming, and offline relay circuit is almost the same, as long as there is an electrician foundation, basically can be up to grope for a month, there is a kind of PLC application base, in a brand, usually can also be very quickly. And hardware products in the market has a ready-made, does not have to worry about the underlying electronic hardware circuit.

PLC conform to used in the electrician

habits of thinking is to look for the line, relocate and wiring, the PLC is to cater to the design, on the computer, and is basically a face often and often a combination of closed contact problem, some self-preservation and interlock circuit, programming and wiring is the same. And PLC controller and periphery connection, the somebody else has been designed to rows of terminals, directly connected to go, do not think too much details.

flower of programming and single chip microcomputer is completely letters, is not straightforward, some loop jump structure can be used to deal with, but with wiring is different feeling, want to make an electrician to master these complex logical thinking, and to take into account the peripheral circuit and control problems, is worrying.

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