YOKOGAWA UT55A - Page 278

11-3
IM 05P01C31-01EN
AlarmFunctions
11
DeviationHighLimitAlarmandDeviationLowLimitAlarm
PV
Alarm hysteresis
Alarm hysteresis
Deviation low limit
alarm setpoint (negative setpoint)
Time
ON OFF
OFF
ON OFFOFF
Deviation high limit
alarm output
Deviation low limit
alarm output
Target setpoint
(SP)
Contact type in the figure above: Energized when an event occurs (factory default).
When a negative setpoint is set for the deviation high limit alarm setpoint, the deviation setpoint will be
lower than the SP.
Moreover, when a positive setpoint is set for the deviation low limit alarm setpoint, the deviation setpoint
will be higher than the SP.
Deviation high limit
alarm setpoint (positive setpoint)
DeviationHighandLowLimitsAlarm
PV
Alarm hysteresis
Alarm hysteresis
Deviation high and
low limits alarm setpoint
Time
ON OFF
OFF ON OFF
Deviation
high and low limits
alarm output
Target setpoint
(SP)
Contact type in the figure above: Energized when an event occurs (factory default).
DeviationwithinHighandLowLimitsAlarm
PV
Alarm hysteresis
Alarm hysteresis
Deviation within high
and low limits alarm setpoint
Time
ON ON OFF OFFON
Deviation within
high and low limits
alarm output
Target setpoint
(SP)
Contact type in the figure above: Energized when an event occurs (factory default).
11.1SettingAlarmType