Omron GRT1 - 11-2007 Operation Manual page 147

Analog Input Units
Comparator
126
5. To set the sampling cycle, click the Rate of Change Tab and input the de-
sired value for the sampling cycle in the Sampling Rate Field.
6. Return to the General Tab Page, click the Download Button, and then click
the Reset Button to reset the Unit.
7. Click the OK Button to exit.
When the High High Limit, High Limit, Low Low Limit, and Low Limit are set in
the Unit, a flag will turn ON when a value exceeds the setting range. The four
set values are High High Limit (HH), High Limit (H), Low Low Limit (LL), and
Low Limit (L), and the values can be compared with those in Analog Data.
When any of these values is exceeded, the Comparator Result Flag in the
area for Analog Status Flags turns ON. If an alarm does not occur, the Normal
Flag (pass signal) turns ON.
Set values
Comparator Result Flag
(in Analog Status Flags)
ON/OFF
Note When the analog input value changes faster than the conversion cycle, the
High Limit alarm may turn ON without the Normal Flag (pass signal) turning
ON for the Low Limit alarm. Configure ladder programs to prevent this occur-
ring.
HH
H
L
LL
HH alarm
H alarm
Normal Flag
(Pass signal)
L alarm
LL alarm
Section 5-4