Omron GRT1 - 11-2007 Operation Manual page 148

Analog Input Units
Setting Hysteresis
OFF Delay
Setting Procedure (Example: DeviceNet Configurator)
1,2,3...
The Comparator Result Flag turns OFF when the value is lower than the hys-
teresis width (H or HH alarm occurs) or exceeds it (L or LL alarm occurs), as
shown in the following diagram. If the analog value fluctuates around the
threshold, and the flag repeatedly turns ON or OFF, setting hysteresis will sta-
bilize the flag operation.
HH set value or
H set value
HH Alarm Flag or
H Alarm Flag
The time until the Comparator Result Flag turns OFF can be extended. For
example, even if the Flag is ON momentarily, the OFF delay can be set so that
the Master can receive notification of the Flag's status.
HH set value
HH Alarm Flag
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.
Hysteresis width
LL set value or L
set value
LL Alarm Flag or
L Alarm Flag
Hysteresis width
OFF delay
Section 5-4
Hysteresis
width
127