A single chip microcomputer in the industrial field can take the place of the PLC? - - - - - -

Not see a post of BBS 'SCM can change the world'. All sorrow to death me, claim to make your own engineering control what I really want to ask you all went to the factory? Read industry environment? Just in the control room to see most.

understand industrial protection grade? Understand the redundant systems? What is needed to understand industry?

real-name against all think a microcontroller can take the place of PLC in the field of industry, you are the lab to stay outside for a long time do not know the fog haze.

one, from the basic first, stability and reliability, are you a piece of the stability of the single chip microcomputer and reliable performance is better than IP67 kind of products? Understand the degree of protection? Seen bad industrial site? Seen the open equipment operation?

after a heavy rain wet and tide are you sure you that SCM can line? In winter the temperature of minus you dare to ensure that it can also run? I can't believe this.

three, industrial field control is just a part of, still need to collect, communication, superior, configuration, motion control and display, etc, all these things need to rely on a complete industrial system and communication protocol, such as Siemens has a complete set of things can realize these functions, microcontroller is you want to how to do it? Behavior of various Modbus, profibus and profinet, OPC, etc) is how to achieve like?

4, development cycle, and the PLC manufacturers are constantly improve their own programming software, allowing it to become more and more simple service engineers, and all kinds of block is also more and more convenient and humanized to call, such as PID module, motor control module, etc. , greatly reduce the pressure of the development of the engineers also shorten the development cycle, single chip? Own thing don't have confidence to beat the Siemens engineer?

this is a configuration software, single-chip computer how to do? By a person development? Dead tired, home at the time of bid is prone to severe lack of time limit for a project, highly integrated modular PLC how things a lot of time in front of the time limit for a project are stretched, the single chip microcomputer development is estimated date, let alone to support HMI, visual control system, hundreds of brands and hardware driver on the market, even if you really do, meet dozens of frequency converter, do you think of the single chip microcomputer interference can carry it live? Large projects, got a high voltage high power motor, start the whole grid quiver, the single chip microcomputer up various numerical may not like channeling day too?

5, distance problems sometimes

industry is to cross-regional integration and monitoring, communication methods are used in the Ethernet ( Communication distance) Add repeater, or direct civil broadband optical fiber ( Sometimes distance to several kilometers a few tens of kilometers) And that in the end is likely to be used in Microsoft's Internet explorer ( Yes, you heard me, Siemens WINCC WEB) , you give me support MCU give it a try? As well as meet the case, if unattended or serious accident, need by PLC communication module according to send text messages to relevant personnel ( Lead, for example) , single chip microcomputer can? How long does it take to develop?

say so many, also didn't say, just don't like those who believe that use the single chip microcomputer instead of the PLC laboratory personnel, can use, so what do you think of those in power plant at hundreds of thousands of millions of a system of AB is a waste?

although most of the main control chip in the PLC controller is MCU microcontroller.

PLC's advantage is can use ladder diagram for secondary development, first you have to be clear: PLC is used for electrical engineers. Electrical engineer is not electronic engineers, their work is not only to consider how the MCU you relay to control the machine tool. Even some electrical engineer will not MCU development language such as C language and assembly language ( How do you let people play? ) On 21 IC, a few years ago a guy said that to develop new PLC, using C language to replace the ladder diagram, as a result, he on the BBS scampering disappeared after a month or two.

next PLC has the advantage of strong stability. You may think the iPhone's APP suddenly back a moment do not have what problem, back on the line, is not restart.

so you want to do with MCU, relay, optical coupling PLC can, but not carefully planning and design, debugging, testing, all kinds of immunity test certification, best known as the relay controller, rather than a true can be used for industrial field of PLC. General industrial site equipment, development and design is completed, the certification test, won't change, after the mass production is according to the set of circuit, the underlying process certification test to production, modify any chip driver code all needs to be certified.

MCU is components, PLC is made up of components and large set of software system, the former can replace the latter is asked: can take the place of icebox wan chai pier leek pig pork meat dumplings?

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