17
5
SETTING OF FUNCTIONS
17
SETTING OF FUNCTIONS
Chapter
5
5-2.
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.
< Comparison conditions >
- HH
ON condition:
Indicated value > HH limit value
OFF condition:
Indicated value
≦
(HH limit value - hysteresis value)
- HI
ON condition:
Indicated value > HI limit value
OFF condition:
Indicated value
≦
(HI limit value - hysteresis value)
- LO
ON condition:
Indicated value < LO limit value
OFF condition:
Indicated value
≧
(LO limit value + hysteresis value)
- LL
ON condition:
Indicated value < LL limit value
OFF condition:
Indicated value
≧
(LL limit value + hysteresis value)
< The example of hysteresis operation >
Hysteresis setting is the same for HH/HI/LO/LL limit.
Point
HI limit
LO limit
+
0
Hysteresis range
Time
-
Indicated value
OFF
ON
With hysteresis
Without hysteresis
By setting hysteresis, cha
ttering can be prevented
in such a case as subtle
fluctuations of signals.
HI limit
HI
LO
OFF
ON
OFF
ON
OFF
ON
Summary of Contents for F331
Page 1: ...OPERATION MANUAL 26MAY2014REV 1 02 DIGITAL INDICATOR F331 ...
Page 79: ...70 8 SPECIFICATIONS 70 SPECIFICATIONS Chapter 8 8 2 Dimensions Unit mm ...
Page 82: ...73 8 SPECIFICATIONS 73 SPECIFICATIONS Chapter 8 When the RS 485 option is equipped Unit mm ...
Page 83: ...74 8 SPECIFICATIONS 74 SPECIFICATIONS Chapter 8 When the RS 232C option is equipped Unit mm ...