APPARATUS AND A METHOD FOR COMMUNICATING EXPENDED MODULES IN A PROGRAMMABLE LOGIC CONTROLLER, PARTICULARLY FOR IMPROVING THE OPERATING PERFORMANCE OF A PLC THROUGH RAPID DATA COMMUNICATION

摘要

PURPOSE: An apparatus and a method for communicating expended modules in a programmable logic controller are provided to perform a data communication operation by connecting a basic unit to plural extension modules through a communication line.;CONSTITUTION: A basic unit controls the operation of a PLC(Programmable Logic Controller), and plural extension modules(110) operates based on the control of the basic unit. A first interface card is installed at the basic unit, and plural second interface cards(310) are respectively at each extension module. The plural interface cards includes first and second communication ports(312,314).;COPYRIGHT KIPO 2010