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Analysis of the application study of PLC and DCS
2023-12-08
PLC and DCS, as important control facilities in the field of automatic control, are increasingly being used in various production control sites. They have become indispensable control tools in the large production system of manufacturing industry. For the application of PLC and DCS system, we often have such doubts: What are the differences and connections between PLC and DCS? What are the aspects that need our special attention when using them? What are the bottlenecks that restrict their technical development at this stage?
First of all, if you want to be good at what you do, you must first be good at what you do. For the difference between PLC and DCS we must have a clear definition, do not see them as the same control tool, the actual function is very different. The so-called decentralized control system (DCS) is the integration of computer technology, control technology, communication technology, CRT technology, it is mainly for the production process monitoring, control, operation and management of a control system. DCS and PLC are similar in terms of the basic configuration of software configuration, but DCS is more powerful. For example, database generation, historical data generation, graphic generation, report generation and control configuration. While PLCs generally control simple objects, DCSs can control all the equipment of an enterprise and become a central hub. In the battlefield of production control they are one for the general and one for the marshal, and there is no mutual control between who controls whom. PLC can give signals to DCS, in turn DCS can also give signals to PLC, the two cooperate with each other, and their master-slave relationship depends mainly on the requirements of the equipment.
The development of PLC is very rapid, and with it also brings various challenges from the technology, talking about how to break through the bottleneck of the development of PLC at this stage, we should broaden our horizons and think about how to achieve a national level, common, common, comprehensive PLC platform, a PLC common platform, whether as information products, control technology products or the backbone of the integration of two, should be focused attention. The platform includes three parts: R&D/design, manufacturing, and application, and gives the specific product target requirements (system hardware and software) and functional requirements (hardware and software general technical indicators, advanced performance and reliability indicators) of a universal PLC platform.
Review the development of DCS road, the division of the various technical stages is very important point is dependent on the increase in the number of bits of microprocessors, some even proposed a microprocessor update, DCS technology will rise a level. In this regard, DCS is the product of a high degree of combination of computer technology, control technology and network technology. dcs usually uses a number of controllers (process stations) to control a number of control points in the production process, the controllers are connected through the network and can exchange data. A computer operating station is used to connect to the controller through the network to collect production data and communicate operating instructions. Therefore, DCS technology is inevitably updated with the technology of microprocessors to meet the needs of new systems.