48
7−2−5.
Hysteresis on comparator
The comparator S1, S2, S3 and S4 in the instrument can set hysteresis for prevention from
chattering at output relay.
Hysteresis can be used by the combined setting of data width and time width. Moreover,
effective direction for hysteresis can be selected from either “OFF delay” or “ON delay”.
These selection can be made in Function mode. (Related Functions are FUNC−14, FUNC−15
and FUNC−24). As for default, hysteresis “OFF” is set.
Warning ● Depending on the setting of comparator hysteresis, ON/OFF
condition for each contact output may differ. If wrong mode is
selected, ON/OFF condition for each contact output become
inadequate and it may cause an unexpected accident due to
malfunction on peripheral instruments, so care should be taken fully.
As for example of S1, the operation of judgement display section and contact output when
hysteresis on comparator is set, will be shown as follows: Same operation will be performed in
case of S2, S3 and S4.
(1)
When the operation of “contact ON at more than or equal to set value” is selected at S1 and
also effective direction for hysteresis is set as “ON delay”
ON
OFF
S! Set Value
Hysteresis time width
Time
Hysteresis
data width
Display
S1 judgement display,
S1 contact output
(2)
When the operation of “contact ON at more than or equal to set value” is selected at S1 and
also effective direction for hysteresis is set as “OFF delay”.
ON
ONON
ON
OFF
S1 Set value
Hysteresis data
width
Time
Hysteresis time width
S1 Judgement display,
S1 Contact output
Display
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