Operating Procedures: Photoelectric Sensors
30
Note: These teaching steps are for turning output ON at the mark. The output can be set to turn On at the background and turn OFF at the mark by reversing the order
of teaching.
Note: Set input error of each signal pulse to within
±
0.1 s.
Automatic Teaching
Example of Connection with Programmable Controller
Note: Connect the Sensor as shown in the figure above when connecting it to
a Programmable Controller.
Precautions for Using Automatic Teaching
In the following application conditions, incorrect judgment
may occur using automatic tuning. If this occurs, use one-
point teaching or two-point teaching.
•
The background has a color pattern.
•
There is a lot of variation in the samples.
•
The surface has height differences or protrusions.
Step
Operation method
Operation condition
3
If the teaching is OK, move the mark and press the SET button when
the mark is at the position of the background.
•
If the teaching is OK, the detection level indicators (green) will all
be lit.
•
If the teaching fails, the threshold indicators (red) will all flash.
4
If the teaching is OK, the setting will be completed.
Set the mode selector switch to RUN.
If the teaching fails, perform the setting again from step 2.
3
Automatic Teaching
Step
Operation
1
Check that the mode selector switch is set to either RUN or ADJUST.
2
A pulse of 0.9 s (see note) will be input to the remote control input/output.
3
Teaching will be performed automatically when the mark is moved. (Teaching will be completed after the mark passes six times.)
•
If teaching is OK, answer-back of 0.3 s will be output from the remote control input/output.
•
If teaching fails, answer-back will not be output. In this case, perform the adjustment again using two-point teaching.
(Teaching will not be OK if there is no difference in light levels between the mark and the background.)
4
If answer-back is detected, the setting will be completed. The output will turn ON at the mark (which has the shortest passage
time), and measurement will start.
LEVEL
OUT
TEACH
RUN
SET
ADJ
LEVEL
OUT
TEACH
RUN
SET
ADJ
LEVEL
OUT
TEACH
RUN
SET
ADJ
Press
NG
OK
Detection level indicators (green) lit
Threshold indicators (red)
flashing (with no difference
in light level)
Mark
Sensor
Background
1.8 s
0.3 s
Teaching completed.Sensing restarts.
0.9 s
Automatic
teaching
Answer-back
ON
OFF
Remote control input/
answer-back output
Incident light
level
1’
2’
3’
4’
5’
1
2
3
4
5
Teaching starts.
Dummy sampling
(1 mark)
Sampling
(5 marks)
Time
Time
Mark (short time)
→
Output ON
Threshold setting at best position
Background (long time)
→
Output OFF
I/O Unit
Programmable Controller
Output
Input
Sensor
Remote control
input/output
Registering Marks
