Patent ID: 6772046
Filing Date: 2004-08-03
Classification: G05B,H01L,Y02P,Y10S

Abstract:
An apparatus for monitoring an operational failure of at least one stocker for stocking a semiconductor wafer cassette, wherein said stocker is divided into a plurality of parts, comprising:a generation means for generating stocker state information representing an operational state of said stocker in response to a stocker state signal issued from said stocker, said stocker state information including identification information representing said stocker; identification information representing at least one part contained in said stocker; and a flag representing whether at least one part contained in said stocker has failed; a monitoring means for inspecting the stocker state information to update the operational state of said stocker previously stored; and for generating a warning signal when at least one part contained in said stocker has failed; and a warning means for generating an audiovisual warning sign in response to the warning signal.