Network extension method of programmable logic controller and network extention system using the same

The PLC network expansion method and a network system using the same extension are provided. Network expansion system according to the present invention expand the manager to write and receive control data from the controller and the controller for controlling the at least one extended base, the network frame, and forwarding the created network frame to the at least one expansion base consists of the main base, and at least one extended base that includes extension driver for extracting the control data from the network frame received from the expansion manager unit and to control the module group attached on the basis of said control data including a do. Whereby the distance and only be able to compensate for the constraints of performance, but is able to have the best / optimal resource efficiency and high performance, system programmers who are familiar with the system of the existing expansion scheme is one and a succession of program ideas from the expansion system using the network by maintaining a castle it is possible to maintain the existing system and program compatibility.