Abstract: A PID controller includes: a manipulated variable calculating portion that calculates a manipulated variable MV based on a set point SP and a process variable PV through a PID control calculation; a manipulated variable outputting portion that outputs a manipulated variable MV to outside of the controller; an alarm notifying portion that generates an alarm when a problem has been detected; a data recording portion that temporarily records time series data for the process variable PV; and a data storing portion that reads out and storing data recorded by the data recording portion 15 before and after the alarm event.

Abstract: A PID controller includes: a manipulated variable calculating portion that calculates a manipulated variable MV based on a set point SP and a process variable PV through a PID control calculation; a manipulated variable outputting portion that outputs a manipulated variable MV to outside of the controller; an alarm notifying portion that generates an alarm when a problem has been detected; a data recording portion that temporarily records time series data for the process variable PV; and a data storing portion that reads out and storing data recorded by the data recording portion 15 before and after the alarm event.

Abstract: A PID controller includes: a manipulated variable outputting portion that outputs, to a subject of control, a manipulated variable MV calculated by a manipulated variable calculating portion; a long cycle data storing portion that stores, with each first cycle, time series data for the process variable PV; a short cycle data recording portion that records temporarily, with each second cycle that is shorter than the first cycle, time series data for the process variable PV; and a short cycle data storing portion that reads out from the short cycle data recording portion, and stores, data for an interval wherein there has been a change of at least a prescribed amount in the process variable PV, when there has been a change of at least the prescribed amount in the process variable PV that is recorded in the short cycle data recording portion.

Abstract: A regulator includes an elapsed time measuring portion that measures an elapsed time after commencement of data collection, a data recording portion that records a setting value, a process variable and a manipulated variable, a data collection initiating portion that initiates the data collection when a direction of change of the setting value, when the data collection is stopped, is in a same direction as a direction of change that is a trigger for initiating the data collection, and a data collection terminating portion that terminates the data collection when the direction of change of the setting value, when data is being collected, is in the direction opposite from the direction of change that is the trigger for initiating the data collection, or when time elapsed after the commencement of data collection arrives at a time limit stored in a time limit recording portion of the regulator.

Abstract: A regulator has: a data recording portion recording a setting value; an elapsed time measuring portion measuring elapsed time after commencement of data collection; a data collection initiating portion initiating the data collection if a direction of change of the setting value is a direction of change of the setting value that is a trigger for starting the data collection, when the data collection is stopped; a data collection terminating portion terminating the data collection when time elapsed after the commencement of the data collection has arrived at a data collection termination time limit, when the data collection is being performed; and a data displaying portion switching a display of a graph display of most recent time-series data, from the commencement of most recent data collection until termination of the most recent data collection, recorded by the data recording portion, when the data collection has been completed.