Fault diagnosis apparatus and method for sequence control system

DETAILED DESCRIPTION Accordingly, it is an object of the present invention to eliminate the disadvantages of the conventional methods/apparatuses and to shorten the time required for fault diagnosis on the one hand and to make fault diagnosis even by an inexperienced worker possible on the other hand, by automating the presumption of fault location which has so far been made by the operator.
According to the present invention, there is provided a fault diagnosis method and apparatus wherein by monitoring the progress of the sequence steps, identification of the sequence step where a fault has occurred may be facilitated, and in the case of any abnormal progress of sequence steps, the sequence step in trouble may be indicated.
The objects other than those mentioned above, features and advantages of the present invention will become apparent when reading the detailed description below with reference to the accompanying drawings.