The origin of the respective technological development
A computer is a device designed to meet the requirements of rapid and massive data processing. In terms of hardware structure, the bus has a high degree of standardization, strong compatibility, and rich software resources, especially with the support of real-time operating systems.
The distributed system has developed from an industrial automation instrument control system to a distributed system centered on an industrial control computer, so it has certain advantages in analog quantity processing and loop adjustment. It was mainly used in continuous process control at the initial stage, focusing on the loop adjustment function.
PLC is developed from the relay logic system. It is mainly used in discrete manufacturing and process control. In the initial stage, it mainly replaced the relay control system, focusing on the switch sequence control.
In recent years, with the development of microelectronics technology, large-scale integrated circuit technology, computer technology and communication technology, PLC has made a leap in technology and function. On the basis of the initial logic operation, functions such as numerical operation and closed-loop adjustment have been added, and functional modules such as analog quantity and PID adjustment have been added; the operation speed has been improved, and the capability of the CPU has caught up with the industrial control computer; the improvement of communication capability has developed many It is a kind of local bus and network (LAN), so it can also be constituted as a distributed system. Especially personal computers are also absorbed into PLC systems.
The development of PLC in process control will be an intelligent transmitter and field bus, and it will expand its functions downward and open the bus.
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