What is plc control system?

Plc control system is a new generation of industrial control device developed on the basis of introducing microelectronic technology, computer technology, automatic control technology and communication technology. It aims to replace relays, perform sequential control functions such as logic and time counting, and establish a flexible remote control system.

It has the characteristics of strong universality, convenient use, wide adaptability, high reliability, strong anti-interference ability and simple programming.

Brief introduction of PLC technology

PLC uses modular signals to provide broadband data communication on wires used for power transmission. It can be realized through the wiring of homes or houses, but it can also be realized through the power system.

The application scope of PLC technology includes not only transmitting radio programs, switching mechanism controlled by public utilities, transmission line protection and automatic meter reading. It can also be used in some automobile applications, sending data, voice and music through the power cord of a direct current (DC) battery, with a special filter to filter out line noise.

PLC must use one of these technologies to prevent distribution system transformers from blocking modular signals from exceeding them. In addition, the ability of power line to carry high frequency is limited. One technology is called electronic circuit. It allows conductors to be used as waveguides, radio frequency signals and full duplex communication, and the transmission rate is many Gbps. However, without this technology or similar technology, the transmission rate is limited to several hundred bps.

The circuit may be miles long. But for short LAN transmission lines, it is allowed to run at the speed of Mbps. This is enough for the first floor of an office building or family, and no special data transmission wiring is needed.

The above contents refer to Baidu Encyclopedia-Control System.