E3S-A
Structure of Sensor I/O Connector
Adjustment Methods
Sensitivity Adjustment for Diffuse-reflective Sensors Set to Light ON
Unlike conventional Photoelectric Sensors, the variation in the sensitivity of E3S-A Photoelectric Sensors is minimal. This means
the sensitivity can be adjusted on only a single Photoelectric Sensor, and then the adjusters on the other Photoelectric Sensors
can be set to the same scale position. There is no need to adjust the sensitivity of each Photoelectric Sensor individually.
E3S-AR41
E3S-AR91
Light-ON
L Side
(LIGHT ON)
Retro-reflective Sensors
Dark-ON
D Side
(DARK ON)
Item
Sensing condition
Sensitivity adjuster
Indicators
Procedure
1) Position A
Locate a sensing object at the sensing
distance, set the sensitivity adjuster to
the minimum scale position, and
gradually increase sensitivity by turning
the sensitivity adjuster clockwise until the
incident light indicator (
red LED
) is ON.
Position A is where the indicator has
turned ON.
2) Position B
Position B is when the sensing object is
removed and the sensitivity adjuster is
turned clockwise until the incident light
indicator (
red LED
) is ON. Position C is
where the adjuster is turned
counterclockwise (reducing the
sensitivity) from position B until the
incident light indicator (
red LED
) is OFF.
When there are no background objects,
the maximum sensitivity is position C.
3) Setting
---
Set the sensitivity adjuster to halfway
between (A) and (C) (at the optimum
sensitivity). Check that the stability
indicator (
green LED
) turns ON
according to whether the sensing object
is there or not. There is not sufficient
margin if it does not turn ON. If this is the
case, reconsider the detection method.
Model
Operation
mode
Timing charts
Mode
selector
switch
Output circuit
T
T: OFF-delay timer (0 to 100 ms)
Incident light
No incident light
ON
OFF
ON
OFF
Operate
Reset
Light indicator
(red)
(Between blue and black)
Output
transistor
Load
(e.g., relay)
4.4 K
(External
diagnostic input)
(Self-diagnostic
output)
Z
D
Light
indica-
tor
Stability
indicator
(green)
Photo-
electric
Sensor
main
circuit
Load
(relay)
Brown
Blue
Black
(Control
output)
100 mA max.
10 to
30 VDC
(red)
Load
(relay)
Orange
50 mA
max.
Pink
Z
D
T
T: OFF-delay timer (0 to 100 ms)
Incident light
No incident light
ON
OFF
ON
OFF
Operate
Reset
Light indicator
(red)
(Between brown and black)
Output
transistor
Load
(e.g., relay)
2
4
1
3
1
2
3
4
Terminal No.
XS2F-D421-DC0-A
Brown
Blue
Black
Note: Pin 2 is not used.
Classification
Wire color
Connection Pin No.
Application
For DC
Brown
1
+V
---
2
---
Blue
3
0 V
Black
4
Output
Photoelectric
Sensor
Sensing object
Backg-
round
object
Min.
Max.
(A)
Stability
indicator
(green)
Light
indicator
(red)
ON
→
OFF
OFF
→
ON
Photoelectric
Sensor
Sensing object
Backg-
round
object
Min.
Max.
(B)
(C)
ON
→
OFF
ON
→
OFF
Stability
indicator
(green)
Light
indicator
(red)
Min.
Max.
(C)
(A)
ON
ON
→
OFF
Stability
indicator
(green)
Light
indicator
(red)
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