E3X-N
E3X-N
8
NO-OBJECT TEACHING
With an Initial Operating Level Compensation Function
With through-beam (Dark-ON) fiber cable
1. Set mode selector to TEACH. Press
teaching button for 0.5 to 2.5S
without a sensing object.
2. The first sensing object is in the sensing area.
0
0
Large
Small
Operating level
Operating level
10%
ON
OFF
Large
Small
Light level with
no object
Set the operating level to
±
10% of the light level.
The light value decreases and
the Photoelectric Sensor works
in through-beam operation.
Operating level
10 %
10 %
Light
Light
Change to
RUN mode
3. Sensing objects continue to pass through the sensing area.
Large
Small
0
(1)
(2)
(3)
(4)
(5)
(6)
Considering a drop in light value due to optical axis divergence or dust
on the lenses, sample the light of the first to fifth objects. Then reset the
operating level to the median value between the lowest light with a sens-
ing object and the light without sensing object.
Resetting
Operating level
Light
With Reflective (Light-ON) Fiber Unit
1. Teaching button is pressed once.
2. The first sensing object is in the sensing area.
3. Sensing objects continue to pass through the sensing area.
Operating level
10%
ON
OFF
0
Large
Small
Operating level
Set the operating level to
±
10% of the light level.
Operating level
Large
Small
0
Light level of
background
The light level increases and the
Photoelectric Sensor works in re-
flective operation.
10%
10%
Considering the sensing object positions and the color differences of
sensing objects, sample the light of the first to fifth objects. Then reset
the operating level to the median value between the lowest light with
a sensing object and the light without a sensing object.
Large
Small
0
(1)
(2)
(3)
(4)
(5)
(6)
Resetting
Operating level
Light
Light
Light
Note: If the light value up to the fifth object is at least
twice as large as the operating level, the initial set
operating level (10%) will be maintained.
Change to
RUN mode
Note: 1. After no-object teaching, when the E3X-N
is turned off and on, the operation level will be set to the +10% of the initial light
level (refer to the above (1)) in reflective operation and –10% of the initial light level in through-beam operation and stand by.
2. After performing no-object teaching and changing to RUN mode, until the first sensing object is in the sensing area, the control
output will be prohibited (OFF). The control output will be determined when the first sensing object is detected.
3. The initial operating level compensation function will operate after teaching and/or after the E3X-N
is turned on.
4. During no-object teaching, after the E3X-N
is in RUN mode, each channel requires approximately 60 ms to determine the
operating level from the time the first sensing object is in the sensing area. Therefore, when using the E3X-NM (four channels),
set an interval of 60 ms minimum for each channel if sensing objects are forwarded in sequence to the sensing area of each
channel. After the operating level is determined, the E3X-NM will operate with a normal response speed of 500
µ
s.
