Omron CRT1 - 10-2008 Operation Manual page 449

Analog I/O Slave Unit Functions
Peak/Bottom Hold
Setting Using the CX-Integrator
1,2,3...
426
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 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 analog data transmitted to the Master Unit after 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, config-
ure a ladder program that considers the transmission delay when the Hold
Flag is turned ON, and enables only the peak/bottom hold values after a fixed
time lag.
1. Turn ON the power supply to the CompoNet Slave Unit.
2. Double-click the icon of the Slave Unit to set in the Network Configuration
Window to open the Configuration Window. (Alternatively, right-click the
icon and select Parameters - Edit from the pop-up menu.)
3. Select the Tab Page for the input where Peak/Bottom is to be set, and se-
lect Peak/Bottom under the Function Choice heading.
Analog input value
The bottom value will
be updated.
Bottom hold value
OFF
Hold function stops
Section 11-4