Omron CRT1 - 10-2008, Operation Manual

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Temperature Input Unit Functions Section 11-5
6. Return to the General Tab Page, click the Transfer [PC to Unit] Button to
download the data, and then click the Reset Button to reset the Unit.
7. Click the OK Button and exit the window.
11-5-3 Peak/Bottom Hold
Peak/bottom hold is used to hold the maximum (peak) value or minimum (bot-
tom) value of the temperature input value. When the Hold Flag allocated in the
Output Area turns ON, the hold function starts, searching for the peak or bot-
tom 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 com-
pare the peak or bottom values allocated as temperature data 1. (Refer to
details on the comparator function.)
Example of Bottom Hold
Note A delay in network transmission time will occur from the time the Hold Flag
turns ON (or OFF) in the Master Unit'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 temperature data transmitted to the Master Unit 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 Unit, con-
figure a ladder program that considers the transmission delay when the Hold
ON
OFF
Temperature input value
Hold value
Previous
value
Hold Flag
The bottom value
is updated.
Bottom hold value
Hold function starts. Hold function stops.