PLC automatic control system

Introduction to PLC automatic control system:

Programmable logic controller (PLC) is an industrial automatic control device developed on the basis of relay contactor control and computer control. It is an application technology of computer technology in the field of industrial control.

With the development of micro electronic technologies such as large-scale and super large-scale integrated circuits, PLC technology has become very mature. It not only enhances control functions, reduces power consumption and volume, reduces cost, improves reliability, and makes programming and fault detection more flexible and convenient, but also with the development of remote I/O and communication networks, data processing, and image display, PLC is developing towards the direction of continuous production process control, and its functions are becoming more and more powerful, It has been widely used in the automatic control of various machines and production processes, and has become a major pillar to achieve industrial production automation.

At present, PLC has become the standard equipment for industrial control in advanced industries, with applications covering almost all industrial enterprises, such as steel, metallurgy, mining, cement (materials: powdered hydraulic inorganic cementing materials), petroleum, chemical industry, light industry, power, machinery manufacturing, automobile, loading and unloading, paper making, textile, environmental protection, transportation, construction, food, entertainment and other industries. With the progress of technology, the application field of PLC is expanding. Nowadays, it is not only used for switching value control, but also for analog and digital quantity control. It can collect and store data and monitor the control system; It can also be networked and communicated to achieve control and management across a wide range of regions. PLC can be large or small, so its control range can be large or small. Small ones only control one device, or even one component, or one site; Large can control multiple equipment, one production line and even the whole factory. It can be said that industrial control can not be separated from PLC in large and small occasions.