PLC networking and communication capabilities are very strong, and new networking structures are constantly being introduced.
The PLC can be connected with the personal computer for communication, and the computer can be used to participate in the programming and management of the PLC control, making the PLC more convenient to use.
In order to give full play to the role of the computer, one computer can control and manage multiple PLCs, up to 32. One PLC can also communicate with two or more computers to exchange information to monitor the PLC control system in multiple places.
PLC and PLC can also communicate. One-to-one PLC communication is possible. Can communicate with several PLCs. Can be as many as tens or hundreds.
PLC, intelligent instruments and intelligent executive devices (such as frequency converters) can also communicate on the Internet, exchange data and operate with each other.
It can be connected into a remote control system, and the system range can be as large as 10 kilometers or more.
It can form a local network, not only PLC, but also high-end computers and various intelligent devices can also access the network. The bus network can be used, and the ring network can also be used. The net can also be set. Networks can also be bridged. Networking can organize thousands of PLCs, computers, and intelligent devices in a network.
The nodes in the network can communicate and exchange information directly or indirectly.
Networking and communication are meeting the needs of today’s computer integrated manufacturing system (CIMS) and the development of intelligent factories. It can make industrial control from point (Point), to line (Line) to plane (Aero), so that equipment-level control, production line control, factory management control into a whole, and then can create higher Benefit. This infinitely bright future has become more and more clearly displayed in front of our generation.
The above applications are focused on qualitative aspects. Quantitatively speaking, PLCs are large and small. Therefore, its control range can also be large or small. Small ones only control one equipment, even one component, one station; large ones can control multiple equipments, one production line, and even the entire factory. It can be said that the large and small occasions of industrial control are inseparable from PLC.
Generally speaking, industrial production processes can be divided into two types; continuous production processes (such as chemical industry) and discontinuous, that is, discrete production processes (such as machinery manufacturing). The former production objects are continuous and cannot be separated into pieces; the latter are discrete and piece by piece. Since PLC has the application of the above-mentioned aspects, and the scale of control can be large or small, both types of production processes have their place.
In fact, PLC has been widely used in various fields of industrial production. From the industry perspective, metallurgy, machinery, chemical industry, light industry, food, building materials, etc., almost all do not use it. It is not only used in industrial production, but also used in some non-industrial processes, such as building automation and elevator control. It is also used in the regulation of environmental parameters of agricultural greenhouses and water conservancy irrigation.
PLC can have the above-mentioned wide range of applications, which is determined by the characteristics of PLC itself, and is also the result of the continuous improvement of PLC technology.
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