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12.4. Hysteresis
A hysteresis width and time is provided for the output relay on/off timing to prevent the
output terminals from chattering.
When the measured value exceeds the set value, the relay is turned on. If the measured
value falls below the set value and it is further reduced by the hysteresis width, or if the
hysteresis time has elapsed, the relay is turned off.
The hysteresis mode, time and width can be set in the function modes (
f1-05
to
f1-07
).
12.4.1. Hysteresis upward 2-level judgment (
f1-05
=
1
)
Relation between HI and OK
When the measured value exceeds the upper limit value, HI is output immediately.
Even if the measured value falls below the upper limit value, OK is not output
immediately. OK will be output when the measured value falls below the hysteresis
width, or when the hysteresis time has elapsed.
Relation between LO and OK
When the measured value exceeds the lower limit value, OK is output immediately.
Even if the measured value falls below the lower limit value, LO is not output
immediately. LO will be output when the measured value falls below the hysteresis
width, or when the hysteresis time has elapsed.
Judgment example
Hysteresis width
Hi
lo
HI output
OK output
LO output
ON
OFF
ON
OFF
ON
OFF
Hysteresis time
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