| 摘要 |
<P>PROBLEM TO BE SOLVED: To secure the soundness of an important circuit that secures the reliability of a system, and to ensure control output result to be a reliable result. <P>SOLUTION: This programmable control device has a BIST (built-in self test) controller 009 and has a function of diagnosing the important circuit 014 (comprising a comparator 005 and a memory controller 006) by the BIST controller 009 to secure the soundness of the comparator 005 for comparing the output of two processors 002, 003, the memory controller 006, and the like. The BIST controller 009 is controlled by the processor 002 to make a BIST diagnosis of the important circuit 014, immediately before periodically performing control arithmetic processings (inputting, arithmetic and output processings). Control operation can thereby be performed, after the reliability of the system LSI004 is secured. As a result, the reliability of control arithmetic processing is improved. <P>COPYRIGHT: (C)2009,JPO&INPIT |
