The present disclosure provides a serial backplane based PLC system with a hot swap function in which when an extended module fails during communication between the backplane master unit and the backplane slave unit, communication between the backplane master unit and the backplane slave unit via the backplane bus is maintained using a backplane design technique. The system includes a central processor unit (CPU) module for transmitting an operation command; at least one extended module for receiving and processing the operation command; a backplane bus connected to a bus line for communication between the CPU module and the extended modules; and at least one backplane module connected to the backplane bus, wherein the at least one backplane module is physically detachably coupled to the at least one extended module, respectively.
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