PURPOSE: To detect abnormality of each sensor even if a non-conforming article is not generated by inputting the working condition of operation condition detecting sensors and while operating working members, and judging normality or abnormality of the operation, and displaying abnormality of an abnormal sensor with a display.

CONSTITUTION: When inoperation condition detecting means 34, 35 detect the inoperation condition that an automatic production system is not operated, control means 30-33 input the working condition of an existence detecting sensor 25 to judge that this working condition is the normal condition corresponding to this inoperation conditioner not. Similarly, the control means 30-33 input the working condition of operation detecting sensors 11, 14, 15, 20, 21 and while operate working members 9, 13, 18 to judge that this working condition is the normal condition changing normally or not. The control means 30-33 display abnormality of a sensor of which working condition is judged not normal with respective judgement with a display 37.