3500-53-133388-01 热工自动化领域

在热工自动化领域，主厂房控制系统基本上毫无例外地使用DCS。而在辅助车间才使用PLC。其主要原因是早期的DCS系统非常昂贵，人们认为辅助车间的运行可以间断，可靠性要求不是很高，且模拟量控制要求较少，从降低成本的角度出发，往往选择PLC来构建控制系统。而锅炉、汽机和发电机的控制系统，要求长期稳定可靠地运行，信号中含有相当比例的模拟量，从系统的性能出发，人们不得不选择了昂贵的DCS。

另外，分析一下主厂房DCS和辅助车间控制系统的市场竞争情况，我们会发现一个有趣的现象。主厂房DCS的竞争往往在不同品牌的供应商或代理商之间展开，竞争激烈，DCS的价格不断下调。而辅助车间控制系统的竞争往往在同一品牌PLC的各个工程商之间进行，门槛较低，竞争更加激烈，但是PLC的价格下调幅度却并不如DCS明显。主要原因是DCS的生产商直接参与竞争，在巨大的市场压力下，不断下调设备制造费用和工程实施费用。而PLC的生产商不直接参与竞争，各个工程商只能下调自身有限的工程费用，空间有限。从现在情况看来，DCS与高档PLC的价格差距已不明显，辅助车间仍然较多地采用PLC，是市场的惯性使然。

PLC和DCS产品市场可谓风起云涌、竞争激烈。纵观PLC市场群星璀璨：世界上有200多家公司生产400多个品种系列的PLC，应用于电力、石油石化、冶金、材料、包装、造纸、汽车和市政各个行业。从行业角度来看，国外厂商占山为王，有着属于各自的势力范围。

DCS市场与PLC相差无几，基本由国外业内强者所把持，可喜的是一批本土厂商如Hollysys、Supcon、Xinhua等企业逐渐发展壮大。由于DCS技术含量高，很多对产品的需求都建立在项目的基础上，这样对DCS的需求也将是一个周期性较长的过程，因此DCS市场格短时间内难有较大改变。当然，由于行业发展速度的不规律性，侧重行业不同的公司可能会因此而发生一些变化。

在今后的控制系统的发展中，我们将会看到DCS和PLC技术逐渐融合的面，这对它们各自的发展以及各行各业的发展都有种促进的作用。

In the field of thermal automation, the main plant control system uses DCS almost without exception. PLCS are used in auxiliary workshops. The main reason is that the early DCS system is very expensive, people think that the operation of the auxiliary workshop can be interrupted, the reliability requirements are not very high, and the analog control requirements are less, from the point of view of reducing costs, often choose PLC to build the control system. The boiler, steam engine and generator control system, requiring long-term stable and reliable operation, the signal contains a considerable proportion of analog, from the performance of the system, people have to choose expensive DCS.
In addition, the analysis of the main plant DCS and auxiliary workshop control system market competition, we will find an interesting phenomenon. The competition of DCS in the main factory is often launched between suppliers or agents of different brands, and the competition is fierce, and the price of DCS is constantly lowered. The competition of auxiliary workshop control system is often carried out between the various engineers of the same brand PLC, the threshold is lower, the competition is more intense, but the price reduction of PLC is not as obvious as DCS. The main reason is that DCS manufacturers directly participate in competition, under huge market pressure, and constantly reduce equipment manufacturing costs and engineering implementation costs. PLC manufacturers do not directly participate in the competition, each engineer can only reduce their own limited project costs, limited space. From the current situation, the price gap between DCS and high-grade PLC is not obvious, and the auxiliary workshop still uses PLC more, which is caused by the inertia of the market.
PLC and DCS product market can be described as surging, fierce competition. Throughout the PLC market stars: there are more than 200 companies in the world to produce more than 400 varieties of PLC series, used in power, petroleum and petrochemical, metallurgy, materials, packaging, paper, automotive and municipal industries. From the perspective of the industry, foreign manufacturers are king of the mountain and have their own spheres of influence.
The DCS market is almost the same as PLC, basically dominated by foreign industry strong, fortunately, a number of local manufacturers such as Hollysys, Supcon, Xinhua and other enterprises have gradually developed and grown. Due to the high technical content of DCS, many of the demand for products are based on the project, so the demand for DCS will also be a cyclical longer process, so the DCS market is difficult to change in a short time. Of course, due to the irregular pace of industry development, there may be some changes in companies that focus on different industries.
In the future development of control systems, we will see the gradual integration of DCS and PLC technology, which has a role in promoting their respective development and the development of all walks of life.