R-S108V01-16-24VDC-C10-1模块仓库现货PLC工控自动化卡件

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专业销售进口DCS 、PLC系统备件模块 、大型伺服系统配件

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专业销售进口DCS PLC系统备件模块

PLC模块，可编程控制器，CPU模块，IO模块，AI模块，通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗等

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PLC first appeared in the United States in the late 1960s. Its purpose is to replace the relay, perform logic, timing, counting and other sequential control functions, and establish a flexible program control system. Formally named and defined in 1976: PLC is a special electronic computer for digital control. It uses programmable memory to store instructions, perform functions such as logic, sequence, timing, counting and calculus, and control various mechanical or working programs through analog and digital input and output components. After more than 30 years of development, PLC has been very mature and perfect, and has developed the analog closed-loop control function. The position of PLC in FCS system seems to have been determined without much debate. PLC is hung on the high-speed bus as a station. Give full play to the advantages of PLC in processing switching value. In addition, in the auxiliary workshops of thermal power plant, such as makeup water treatment workshop, circulating water workshop, ash and slag removal workshop, coal handling workshop, etc., the process in these workshops is mainly controlled by sequence. PLC has its unique advantages for sequence control. The editor thinks that the control system of the auxiliary workshop should take the PLC that follows the fieldbus communication protocol or the PLC that can communicate and exchange information with FCS as the preferred object.Since the first microprocessor-based controller was proposed in 1973, it has been gradually improved and finally formed a fully functional, safe and reliable digital distributed control system DCS. Its performance is much better than that of any control system. It can meet the various requirements of DAS, MCS, SCS and APS systems in thermal power plants. At present, it can also establish a management network through industrial Ethernet to meet the growing demand of thermal power plants to strengthen management. It can be said that the monitoring of DCS system can cover the whole process of large thermal power units.However, since FCS came into being and became practical in the 1990s, the following arguments have been published in public publications: "from now on, the new Fieldbus Control System FCS will gradually replace the traditional DCS"; "When the regulation function is released to the site, the traditional DCS will disappear automatically without the necessity of existence"; "In the next decade, the traditional 4~20ma analog signal system will be gradually replaced by the two-way digital communication fieldbus signal system, and the analog and digital distributed control system DCS will be replaced by the full digital Fieldbus Control System FCS". These arguments are summed up in one sentence: FCS will replace DCS, and DCS will die from then on.The above arguments are all from the mouth of authoritative experts, and are indeed reasonable. Digital communication is a trend, which represents technological progress and can not be blocked by anyone. The two-way digital communication field bus signal system and its huge driving force accelerate the reform of field devices and control instruments, and develop more and more digital intelligent field devices with perfect functions. These are not possessed by DCS system, and the resulting advantages and benefits to the design, configuration, configuration, operation, maintenance, management and other aspects of thermal power plant are also inferior to DCS system. Furthermore, FCS is developed from DCS and PLC, which retains the characteristics of DCS. In other words, FCS absorbs the experience of DCS development research and field practice for many years, including lessons. It seems logical to conclude that "FCS will replace DCS".At the same time, we should also see that DCS system has been developed for nearly 30 years and has been widely used in thermal power plants. Its design idea, configuration and function matching have reached a very perfect level (of course, DCs also has the need for further development, such as advanced software development, to meet the requirements of information integration). It has penetrated into all fields of thermal power plant control system and is also reflected in FCS system. From this point of view, DCS system can not be said to die from now on. Moreover, as mentioned in the previous chapters, DCS system is still useful in those areas where FCS system can not give full play to its characteristics and advantages.It seems that there is no need for us to argue too much about words. We must emphasize who will replace who. Just like the current DCS and the new PLC, due to years of development and research, they both retain their own original characteristics and complement each other to form a new system. The current DCS is not the original DCS. Similarly, the new PLC is not the PLC in the early stage of development. We can say that DCs replaces PLC or PLC replaces DCS, which is obviously inappropriate.