6.COMPARISON FUNCTIONS
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6-2. Hysteresis
The hysteresis value may be determined so as to allow a margin for timing the turning off
of the HI-LO limit comparison. Normally, it is turned on when the indicated value
exceeds the HI limit and is turned off when the indicated value falls below it. However,
by setting the hysteresis, it is turned off when the indicated value falls below the HI limit
further lowered by the hysteresis value.
This function is effective to prevent chattering in such a case where signals fluctuate
(vibrate) subtly.
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Comparison conditions
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- HI limit
ON condition: indicated value>HI limit value
OFF condition: indicated value<=(HI limit value-hysteresis value)
- LO limit
ON condition: indicated value<LO limit value
OFF condition: indicated value>=(LO limit value+hysteresis value)
- HI-HI limit
ON condition: indicated value>HI-HI limit value
OFF condition: indicated value<=(HI-HI limit value-hysteresis value)
- LO-LO limit
ON condition: indicated value<LO-LO limit value
OFF condition: indicated value>=(LO-LO limit value+hysteresis value)
