CONTROLLER WITH DOUBLE STRUCTURE AND METHOD FOR OPERATING THAT CONTROLLER

PURPOSE: A controller including duplication structure and operating method are provided to effectively embody duplication structure by monitoring two independent stations. CONSTITUTION: A first station(110a) includes a first processor module which creates result data by executing an application program. A second station(110c) includes a second processor module which creates the result data by executing the application program and the first processor at the same time. Third stations(110c-110n) outputs the result data received from the processor module which is operated as a master module between the first and the second processor module and passes the result data received from the processor module which is operated as a slave module.