TROUBLE DIAGNOSIS DEVICE IN SEQUENCE CONTROLLER

摘要

PURPOSE:To prevent stoppage of a manufacturing line for a long time by estimating an abnormal point of an input system by referring to the stopping state of the line and data accumulated in the past and informing an operator of the estimated abnormal point when the line abnormally stops. CONSTITUTION:Assuming that a manufacturing line is stopped due to the abnormality of the data of an input system. If a CPU 11 recognizes the abnormality in such state, the CPU 11 transfers the turn-on/turn-off state of input-output data at the moment when the abnormality occurs to a personal computer (analyzing means) 22 through a 2nd communication cable 23. An example of the abnormality recognizing means of the CPU 11 can be such that the turn-on/turn-off state of the input-output data at the time of normal operation of the manufacturing line is previously stored as reference data and the current turn-on/turn-off state is always compared with the reference data to discriminate whether they coincide with each other. The personal computer 22 checks the step number when abnormality occurs in the past and the turn-on/turn-off state of the input- output data in the step by utilizing a data base (data preserving means) 21.