KEYENCE IV Series - Manual (Page 148)

5-14 - IV Series User's Manual (Monitor) -
Adjusting Thresholds for Judgment
The method for manually adjusting the threshold
while in the Test mode.
The threshold adjustment can be started by the
[Limit Adjustment] button in the tool settings of the
Settings Navigator.
1
Display the Sensor Setup Menu screen.
“Displaying the Sensor Setup Menu Screen”
(Page 6-7)
2
Tap the [Limit Adjustment] button.
The [Limit Adjustment] button is available only when
the program that the tool has been set is selected.
3
If multiple tools are set in the program, select
the tool to adjust the threshold from the pull-
down menu and tap the [OK] button.
Select the tool
The sensor turns to the Test mode.
4
Image a high or low-quality-target to be
the reference of judgment.
If the target is to be imaged using an external
trigger, input the external trigger.
If an external trigger cannot be input, tap the
button (Page 4-7) to image the target
by inputting an internal trigger temporarily.
Imaging by inputting an internal trigger finishes
by the
button.
5
Adjust the threshold by checking the
matching rate.
If the matching rate of the high-quality-target is
higher than 90 and if the matching rate of the low-
quality-target is lower than 40, set the threshold to
65 of the value intermediate between 40 and 90.
Matching rate Threshold
y A target is detected as OK if the matching
rate is greater than the threshold, and
detected as NG if the matching rate is lower
than the threshold.
y In accordance with the status result of the
tool, the display color of the tool changes.
“Selecting a display method for tools” (Page 5-7)
y The threshold can be changed by using the
slider or inputting values.
“Editing the value with the slider” (Page 3-14)
y A target is judged by the new threshold from
the judgment process of the trigger output
after the threshold is changed.
y The threshold can be adjusted by checking
the histogram result.
“Displaying the histogram” (Page 5-12)
The displayed contents are as follows.
- The histogram before threshold adjustment
is displayed.
- The status results during threshold
adjustment are not added to the frequency
distribution of the histogram.
- The counts for OK and NG are not displayed.
- The reset button is not displayed.
6
After the adjustment is completed, tap the
[OK] button.
The system returns to the Sensor Setup Menu screen.
If a program is set with more than one tool, a
confirmation dialog for whether or not to adjust
threshold for other tools is displayed.
To adjust threshold for other tools, tap the [Yes]
button and repeat steps 3 to 6.
Adjusting Thresholds for Judgment
5
Operating/Adjusting