Functions and Operations
Section 5 Functions and Operations
5-38
5.13 Preventing Output Chattering
Comparative output chattering results from drift in measurement value near the comparative set value.
Chattering can be prevented by adjusting the hysteresis value.
Hysteresis is a range between the value for which a comparative output turns ON and the value for which
the comparative output turns OFF. When the comparative output turns ON, it only turns OFF after the
change in measurement values is greater than the set hystresis.
The hysteresis can be used to prevent comparative output chattering resulting from measurement value
drift near the comparative set value.
Hysteresis works in direction of decreasing measurement values for comparative set values HH and H
and works in the increasing measurement value direction for comparative set values LL and L.
Hysteresis is set using the following parameter.
* The decimal point depends on the "decimal point position" setting.
Explanation of Functions Hysteresis
Advanced-function setting level
Comparative set value
Comparative
set value
Measurement
value
Measurement
value
Chattering removed
Comparative outputs
(when hysteresis is not used)
Comparative outputs
(when hysteresis is used)
Hysteresis
width
Comparative
set vaLue HH/H
Comparative
set value LL/L
Output HH/H
Output LL/L
Hysteresis
Hysteresis
Parameter Set value Meaning of set value
Hysteresis
hys
0 to 9999 0 to 9,999 *
hys
L
f
(HYS)
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