The selection of DCS system is mainly based on the project scale and investment budget. The digital system-based DCS system and the early analog instrumentation control system have little difference in nature from the implementation of the project. Considering the project scale and investment budget, DCS is more complex and technically demanding than analog meters. DCS can be used with different process processes. It is universal, but DCS has expertise in manufacturing and a certain area. . Such as: HOMEYWELL is mainly used in the petrochemical sector, BAILEY's N90, INFI90 is mainly used for power systems, ROSEMOUNT RS3, Δ-V are mostly used in chemical systems. However, it cannot be denied that there will be some special requirements for different technological processes, such as: the power plant must have electrical adjustment equipment and SOE, the petrochemical sector must have selective control, and the cement industry must have large pure-lag control compensation.
The economics of the dcs system are also the focus of everyone’s attention. The first thing to consider is the price of the DCS itself and the expected benefits. DCS control system has domestic and imported, for the same grade, the import of the control function is stronger, there are some advanced control algorithms, such as Smith prediction, three-dimensional matrix operations, domestic DCS prices are much lower than the import, Can also meet technical requirements. From the structural point of view, the foreign DCS controller manufacturers are not too far apart, the preset algorithm of the controller is slightly different, and the connection mode between the controller and the I/O board is also different. The operating station differs greatly. There are PC-based, there is a small machine-based operating system is generally used UNIX system. The price of minicomputers is much higher than that of PCs. The price of imported minicomputer operating stations is higher than 40,000 US dollars, and many models have been discontinued (such as DEC's VAX and alpha machines). The operating station of the PC is less than 30,000 US dollars. Its operating system uses NT, and its stability is not as good as UNIX. The interface of the minicomputer adopts SCSI and the transmission rate is 8 times that of the serial. With the NT operating system as the operating station, the number of points is less, otherwise frequent crashes, domestic PCs are much cheaper, PC operating stations can be used, the latest models can be used, and the operating personnel install and debug the software. Networking and development are also much more familiar. The monitoring software has special or general-purpose, general-purpose monitoring software is more open, users should choose to use according to the size of the project and budget funds.
The economics of the dcs system are also the focus of everyone’s attention. The first thing to consider is the price of the DCS itself and the expected benefits. DCS control system has domestic and imported, for the same grade, the import of the control function is stronger, there are some advanced control algorithms, such as Smith prediction, three-dimensional matrix operations, domestic DCS prices are much lower than the import, Can also meet technical requirements. From the structural point of view, the foreign DCS controller manufacturers are not too far apart, the preset algorithm of the controller is slightly different, and the connection mode between the controller and the I/O board is also different. The operating station differs greatly. There are PC-based, there is a small machine-based operating system is generally used UNIX system. The price of minicomputers is much higher than that of PCs. The price of imported minicomputer operating stations is higher than 40,000 US dollars, and many models have been discontinued (such as DEC's VAX and alpha machines). The operating station of the PC is less than 30,000 US dollars. Its operating system uses NT, and its stability is not as good as UNIX. The interface of the minicomputer adopts SCSI and the transmission rate is 8 times that of the serial. With the NT operating system as the operating station, the number of points is less, otherwise frequent crashes, domestic PCs are much cheaper, PC operating stations can be used, the latest models can be used, and the operating personnel install and debug the software. Networking and development are also much more familiar. The monitoring software has special or general-purpose, general-purpose monitoring software is more open, users should choose to use according to the size of the project and budget funds.
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