CENTRAL PROCESSING UNIT FOR DATA TRANSFER SYSTEM

PURPOSE:To improve the reliability of received data by judging either an interruption signal based on a data reception completing signal from a communication processor or an interruption signal caused by external noise and ignoring this interruption signal in the latter case. CONSTITUTION:A central control unit(CCU) 100 exchanges data with a local control unit(LCU) through a multiple communication line 112 and outputs the control instruction of an actuator connected to each LCU based on the data of the respective LCUs obtained by communication. An interruption signal 204 is the data reception completing signal to be outputted when a communication processor 101 of the CCU 100 receives serial data as the input data of the respective LCUs from the multiple communication line 12 and converts the serial data to parallel data and a CPU 200 can read data. A confirmation signal 205 is used for judging whether the interruption signal is the data reception completing signal or not, and a, mask signal 206 prevents the interruption signal from being outputted to the CPU 200 when it is not the data reception completing signal.