Omron DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008 Operation Manual page 362

Analog Input Terminals
Peak/Bottom Hold
5. For offset compensation, set the offset value in the Scaling Offset field.
Also select either Default Scaling or User Scaling in the Scaling Type
field.
6. Return to the General Tab, click the Download Button, and then click the
Reset Button to reset the Unit.
7. Click the OK Button and exit the window.
Peak/bottom hold is used to hold the maximum (peak) value or minimum (bot-
tom) value of the analog input value. When the Hold Flag (output) allocated in
the OUT Area turns ON, the hold function starts, searching for the peak or
bottom value until the Hold Flag turns OFF. (The peak/bottom value is
refreshed when the Hold Flag turns OFF.) The comparator function can be
used to compare the peak or bottom values allocated as analog data. (Refer
to details on the comparator function.)
■ Example of Bottom Hold
Hold value
Previous value
Hold Flag
ON
Hold function starts
Note A delay in network transmission time will occur from the time the Hold Flag
turns ON (or OFF) in the Master's ladder program until notification of the flag's
status is actually sent to the Slave. Therefore, even when the Hold Flag is ON,
the first analog data transmitted to the Master when the CPU Unit power is
turned ON may be the data from when the Hold Flag was OFF. To collect
peak/bottom hold data using the Hold Flag at the Master, configure a ladder
Analog input value
The bottom value
will be updated.
Bottom hold value
OFF
Hold function stops
Section 7-4
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