Patent Number: 6,324,655

Title: Input/output controller providing preventive maintenance informationregarding a spare I/O unit

Abstract: A I/O controller which is connected to a plurality of I/O units and onespare I/O unit, controls a plurality of I/O units based on a command froma master unit, and allows a spare I/O unit to be used in place of an I/Ounit where an abnormality is found, when an abnormality is found in any ofa plurality of I/O units. This I/O controller gives a decision aboutnormality at a time interval not in use for an operation when no commandfrom a master unit (10) is being processed, after selecting I/O units (30)or a spare I/O unit (31). When it gives a decision of abnormality, thecontroller stores information about the abnormality in preventivemaintenance information storage register (25) as preventive maintenanceinformation.

Inventors: Matoba; Tatsuo (Kawasaki, JP), Yorimitsu; Keiichi (Kawasaki, JP)


International Classification: G06F 11/20 (20060101); G06F 11/10 (20060101); G06F 11/22 (20060101); H02H 003/05 (); H03K 019/003 ()

Expiration Date: 11/27/2014