11-18
IM 05P02C41-01EN
11.3 Setting Hysteresis to Alarm Operation
Description
If the On/Off switch of the alarm output is too busy, you can alleviate the busyness by
increasing the alarm hysteresis.
Hysteresis for PV High Limit Alarm
Point of ON/OFF action
(alarm setpoint)
PV
Output
ON
OFF
Hysteresis
When Setting Hysteresis of 5ºC and 15ºC for PV High Limit Alarm
Closed (ON)
Open
Time
Alarm-1 setpoint:
100
ºC
(example)
Closed (ON)
Open
Time
Alarm-1 setpoint:
100
ºC
(example)
HYS: 15
ºC
(example)
HYS: 5
ºC
(example)
PV
PV
Alarm ON
OFF
ON
OFF
ON
OFF
Alarm ON
OFF
Setting Details
Parameter
symbol
Name
Display
level
Setting range
Menu symbol
HY1 to HY8
Alarm-1 to -8
hysteresis
EASY
Sets the hysteresis setpoint as a
display value.
-19999 to 30000 (set it within the
input range)
The decimal point position
depends on the input type.
ALRM
Note1: In Cascade control, the LP2 lamp is lit while the Loop-2 parameter is displayed.
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