DISPLAY DEVICE OF MEASURED VALUE

PURPOSE: To obtain a display device by which a trend in the past is reflected and by which the transition of a change in the future is displayed clearly by a method wherein a measured value which is measured in a time series manner is stored in a storage means, the change direction of a latest measured value and that of a stored measured value in the past are detected and a mode based on the detected change directions is updated. CONSTITUTION: A measuring point 1 is connected to a detector 11 via an interface 10, and a change in a measured value is always monitored. The detector 11 reports a digitally converted measured value to a state judgment part 31. The judgment part 31 judges the deviation between a reported measured value and a previously taken-into measured value, and it stores the measured value in a memory 201 as latest data 21A. A processing part 32 transmits the data 21A and past data 21B sequentially at a preset cycle so as to be shifted. When a communication processing part 33 received a polling from a transmission control device 60A, it reports the polling to the processing part, and it edits the returned data 21A and transition information together with a point as the identification code of the point 1 so as to be transmitted to the device 60A.