3-15
TI04L55B01-01EN
3.2 Various Functions
3.2.1
Alarm Function
For the measured values, up to four levels of alarms can be set on each channel.
Alarms can be output to relays and internal switches.
The alarm types that you can set vary depending on the channel type (input/output, math,
communication).
Alarm Types
Type
Explanation
High limit (H)
An alarm is activated when the
measured value is greater than or
equal to the alarm value.
Alarm value
Alarm output ON
Hysteresis
Measured value
Lower limit (L)
An alarm is activated when the
measured value is less than or equal
to the alarm value.
Alarm output ON
Alarm value
Measured value
Hysteresis
High limit on rate-
of-change (R)
An alarm is activated if the increasing
rate-of-change of measured values
over a certain interval is greater than
or equal to the specified value.
Change in the
measured value
Measured value
Time
Interval (t2 – t1)
T2
T1
t1
t2
Amount of change
in the setting
|
|
T2-T1
Low limit on rate-
of-change (r)
An alarm is activated if the decreasing
rate-of-change of measured values
over a certain interval is greater than
or equal to the specified value.
Change in the
measured value
Measured value
Time
Interval (t2 – t1)
Amount of
change
in the setting
|
|
T2
T1
t1
t2
T2-T1
Delay high limit (T)
An alarm is activated if measured
values remain greater than or equal
to the alarm value for a specified time
period (delay period).
Alarm output ON
Delay period
Alarm value
Measured value
Delay low limit (t)
An alarm is activated if measured
values remain less than or equal to
the alarm value for a specified time
period (delay period).
Alarm output ON
Delay period
Alarm value
Measured value
Continued on next page
3
Functions
Summary of Contents for SMARTDAC+ GM
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