A1893 原装正品质保一年

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Comparison of PLC control system and computer control system:
Performance index Computer control system PLC control system
Reliability Commercial Grade Industrial Grade
Working mode Interrupt mode, the program waits for conditions to be met Scan mode, the program continues to execute if the conditions are not met
Programming Language Assembly Language, High Level Programming Language Standard Programming Language
High requirements for working environment Not high requirements for the environment, adapt to the requirements of industrial site environment
User skill requirements Special training is required The programming language is easy to master, and there are many programming languages
System software Strong function, and occupies a large storage space Special function, occupies a small storage space
Applicable fields Home, office, management, scientific computing Specially used for industrial process control
high price low
Comparison of PLC control system and distributed control system:
Distributed control system is a process instrument control system specially designed for industrial process control, also known as distributed control system. According to the analysis of the development history of programmable controller and the development history of DCS, the main application occasion of the distributed control system is the analog control of continuous quantity, while the main occasion of the programmable controller is the logic control of switch quantity. Therefore, there are certain differences in design thinking.
In factory automation or computer integrated process control system, in order to disperse danger and 
disperse functions, a decentralized and integrated control system structure is adopted. Programmable controller is a decentralized autonomous control system, which can be used as a lower computer to complete decentralized control functions, which is a qualitative leap compared with the centralized control of direct digital computers. This hierarchical control system is also the basis of the distributed control system.
The programmable controller works according to the scanning mode, and the distributed control system works according to the instructions of the user program. Therefore, the sampling speed of the programmable controller for each sampling point is the same, while in the decentralized control system, different sampling speeds can be used according to the characteristics of the detected object. For example, the sampling speed of the flow point is 1S, and the temperature point The sampling speed is 20S and so on. In addition, in a distributed control system, multi-level interrupt priorities can be set, while programmable controllers usually do not set interrupt methods.
In terms of memory capacity, most of the operations required by the