PLC and DDC in building some of the more control field

Abstract: PLC and DDC in the field of building control some of the more information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Online about PLC and DDC contrast a lot, because for most of the articles after browsing feel are: sell good PLC said PLC, sell DDC said DDC well. 。 。 Tomorrow to give a good said ABC after ABC. Here the difference between the objective of the present situation of the PLC and DDC to it. More flow meter manufacturers choose model price quote you are welcome to inquire, here are some more in the field of PLC and DDC control in building the article details. Online about PLC and DDC contrast a lot, because for most of the articles after browsing feel are: sell good PLC said PLC, sell DDC said DDC well. 。 。 Tomorrow to give a good said ABC after ABC. The objective of the present situation of the PLC and DDC difference of it! Which application of PLC and DDC, have more advantages in building automation system, do the following: 1. Areas of application: DDC is developed by PLC, the PLC is applied in the field of industrial automation specialized, in almost all of the domestic industrial production line control system, thermal power plant control system, the steel mills are the application of PLC system control system, at present there are also a significant part of the floor also the application of PLC control system. Building automation DDC manufacturer is based on the characteristics of building automation from PLC, PLC and the difference is just in its internal curing a part of the program, but also a lack of flexibility of PLC and the ability to deal with complex electromagnetic interference environment. 2. Structure difference: through years of development, now of the PLC in the aspect of network with DDC is the same, actually also supports a variety of protocol, is also a hierarchical structure, also can realize the point-to-point communication, PLC distribution at the scene of the site is not to need to through the upper machine can communication management. 3. Software features: the PC software of DDC system for proprietary software, in fact, from another side it is not compatible, the software of each manufacturer are not the same, and many are in English, the more of a nightmare start for technicians. PC and PLC system software is proprietary software, however, and general configuration software, however, now the domestic general configuration software is pure Chinese, flexible configuration. General configuration software can handle complex industry control system, and what is the words to a mere floor control. Besides PLC system and DDC system debugging are debugging professionals complete configuration, retraining owners operating management, for the owner is actually the same, in contrast, general configuration software can not only realize all professional software function, and can realize many cannot realize the function of the professional software ( Such as high simulation interface, voice alarm, user customization, etc. ) 。 4. Professional: now many building control engineering is the application of PLC system, and proved the DDC functions of PLC system can be completed, experienced PLC building implementation, also have accumulated the whole control process program, energy management and energy saving, at the same time, due to its program with the source of all process, so can quickly make a tailored for different projects. Because there are ready-made process procedures, the scene debugging work also is very short, at the same time, it will more smoothly than DDC debugging, because DDC built-in programs only interface function, is a fixed format, in case of special requirements have to be in far away with factory engineer, and not necessarily can solve. 5. Extensibility: who knows PLC system is universal, open system. At present most of the PLC system and the most used between DDC system operator station are TCP/IP protocol, can do have Internet access. And the DDC charge expensive system software according to the users, the most completed building control system to control operation station dare not to want to! PLC system have the advantage. 6. Security: actually this question just imagine: a coal-fired power plant is power, it suddenly occurred to one of the PLC module is broken, as like the above said will stop to replace the whole system, it will be what kind of consequences, boiler may explode! Ha ha! Was much more serious than the floor control consequences! Now a lot of module of PLC system are pull plug, hot standby redundancy ( These functions, building like this a few years to learn PLC control! ) , PLC is an industrial environment development, in the complex industry control environment module failure or system downtime can have a major accident or loss of life, need the DDC far higher reliability and so on! I don't know how the argument is produced. PLC as control core to reliable, trouble-free operation in harsh environment for a long time, and easy connection, easy maintenance and good isolation, corrosion resistance is strong, can adapt to a wide range of temperature change, MTBF interval ( MTBF） More than 15 years. 7. Debugging and simplified degrees: USES the PLC programming now zui more is ladder diagram language, the language visualize, what you see is what you are, don't need English, common electrician to learn. Now PLC and DDC systems, can be sitting in a comfortable room by a laptop computer and a network cable to system debugging. As for the precision problem with product technical parameters last!

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