Omron GRT1 - 11-2007 Operation Manual page 142

Analog Input Units
Setting Procedure (Example: DeviceNet Configurator)
1,2,3...
■ Example of Valley Hold
Hold value
Hold Flag
Hold function starts
Top/Valley Detection
Timing Flag
Note 1. 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 Unit. 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 top/valley hold data using the Hold Flag at the Master, configure a
ladder program which considers the transmission delay time when the
Hold Flag is turned ON, then enables the top/valley hold values after a
fixed time interval.
2. The time that the Top/Valley Detection Timing Flags are ON can be adjust-
ed by setting the one-shot time. Use the Setting Tool to set the one-shot
time (the setting range is 1 to 65535 ms).
3. If the Hold Flag turns OFF during the time the Top/Valley Detection Timing
Flag is set to be ON, both flags will turn OFF simultaneously.
1. In the Network Configuration Window for the Slice I/O Terminal, double-
click the icon of the Slice I/O Terminal that is to be set. Alternatively, right-
click the icon and select Parameters - Edit. The Edit Device Parameters
Window will be displayed.
2. Click the I/O Module Tab.
3. Click the Edit Button on the I/O Module Tab Page. The Edit Unit Parame-
ters Window will be displayed.
Analog input value
One-shot time
Section 5-4
Valley hold value
Last value is held.
Hold function stops
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