6-12
FUNCTION
DESCRIPTION
CHAPTER 6 FUNCTION DESCRIPTION
6-6 Hysteresis
In this manual, hysteresis refers to a range that is provided above or below an OUT
set value to avoid comparative output from turning off unless the process value falls
outside the range, once the comparative output has turned on at the OUT set value.
Specifying the hysteresis suppresses chattering of comparative output caused by
fluctuations of the process value in the vicinity of OUT set value.
Comparative output ON/OFF conditions are as follows.
Upper-limit action
ON: Process value ≥ OUT set value
OFF: Process value ≤ OUT set value - Hysteresis
Lower-limit action
ON: Process value ≤ OUT set value
OFF: Process value ≥ OUT set value + Hysteresis
Hysteresis can be set to a desired value using parameter "hysteresis".