DUPLEX MPU CALL STAND-BY METHOD

摘要

PURPOSE:To enable restoring the process corresponding to a control frame by executing the process received from an input/output device at the time of MPU default or switching period due to it, after switching of MPU. CONSTITUTION:A host computer 2 having an MPU 4 with duplexed configuration which is controlled by an input/output device 1 via a communication line is provided with a communication control part 3 including the first step which receives a control frame from the input/output device, stores the control frame received in a storage device 7 and then hands over the control frame to the MPU 4 and the second step which receives a response frame from the MPU 4, and in response to that, deletes corresponding control frame from the storage device 7.