Fault detecting system and fault detecting method

A fault detecting system comprising:

• a manipulated variable calculating portion that calculates and outputs a manipulated variable MV based on a setting value SP and a process variable PV;
• a setting value operating portion that changes a setting of the setting value SP in accordance with an operation by an operator;
• a summation information processing portion that tabulates and holds operation summation information for indicating a sum total of the magnitudes of changes of the setting value SP by the setting value operating portion;
• and
• a resetting portion that resets to zero the operation summation information that is held in the summation information processing portion when a reset signal is received from the outside.

The fault detecting system as set forth in claim 1, further comprising:

• a frequency information acquiring portion that acquires, at intervals prescribed in advance, operation frequency information held in the frequency information processing portion;
• a reset value transmitting portion that transmits a reset signal to the resetting portion after the operation frequency information has been acquired;
• a frequency information history storing portion that stores operation frequency information acquired by the frequency information acquiring portion;
• and
• an evaluating portion that outputs an alarm when an amount of increase in a value of a most recent operation frequency information relative to a value of the operation frequency information hat an arbitrary point in the past, stored in the frequency information history storing portion, exceeds a threshold value prescribed in advance.

A fault detecting method comprising:

• a manipulated variable calculating step for calculating and outputting a manipulated variable MV based on a setting value SP and a process variable PV;
• a frequency information processing step for tabulating and holding, by a frequency information processing portion, operation frequency information for indicating a frequency of change of the setting value SP by an operation by an operator;
• and
• a resetting step for resetting to zero the operation frequency information that is held in the frequency information processing portion when a reset signal is received from the outside.

A fault detecting method comprising:

• a manipulated variable calculating step for calculating and outputting a manipulated variable MV based on a setting value SP and a process variable PV;
• a summation information processing step for tabulating and holding, by a summation information processing portion, operation summation information for indicating a summation of change of the setting value SP by an operation by an operator;
• and
• a resetting step for resetting to zero the operation summation information that is held in the summation information processing portion when a reset signal is received from the outside.