The communication between PLC and PLC, and between PLC and upper computer, must adopt its special communication module, and use RS-232 or RS-422A interface, and use twisted pair to connect them into a network through coaxial cable or optical cable. A distributed control system composed of one computer and multiple PLCs carries out "centralized management and decentralized control" to establish an automation network for the factory. The PLC can also be connected to a CRT monitor or printer to realize display and printing.
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