PURPOSE: To exactly and accurately, namely, synchronously set a dummy fault by setting the dummy fault corresponding to a dummy fault parameter by starting a dummy fault processing program at the time of normal interruption to a communication control part and the like. ;CONSTITUTION: The device of a dummy fault setting object is provided with an empty area 10 for writing a dummy fault processing program 11 and a dummy fault parameter 12 and an interruption area 8 for writing a branching instruction to this dummy fault program 11. The dummy fault processing program 11 and the dummy fault parameter 12 are written in the empty area 8, the branching instruction to this dummy fault processing program 11 is written in the interruption area 7, the dummy fault processing program 11 is activated by the branching instruction wirtten in this interruption area 8 when any interruption is generated, the instruction is wirtten back to the original instruction, and this activated dummy fault processing program 11 sets the dummy fault to the device according to the dummy fault parameter 12.;COPYRIGHT: (C)1994,JPO&Japio
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