E3S-A Datasheet, PDF (16/18 Pages) Omron Electronics LLC – General-Purpose Photoelectric Sensor

E3S-A
E3S-A
Self-Diagnostic Function
With this function, the E3S-A sensor checks changes in environmental conditions (especially a change in the ambient temperature) and
self-diagnoses the resistance against the changes. The result is shown by the indicators or an output signal.
Amount of
Incident light Indicator Green Indicator
incident light indicator (red)
Self-
diagnostic
function
Self-diagnostic example
1.2 or more
1.0 to 1.2
With light
incident (red
indicator: ON)
Stable operating —
—
state with incident
Green Red light: Stable
operation is
expected in the
rated temperature
range with the
green indicator
ON.
Green Red
Conditional
The self-
operating state diagnostic
with incident light: alarm output
Stable operation is alerts the
expected if the user to this
temperature
state if it
fluctuation is within continues for
±10% of the
0.3 s.
primary
temperature.
The optical axis misaligned by vibration.
Light decreased by dust.
Dust
0.8 to 1.0
Without light
incident (red
indicator: OFF) ^{Green Red}
With light leakage (through-beam and retroreflective
sensors)
Sensing object
0.8 or less
Green Red
Stable operating —
state with no
incident light:
Stable operation is
expected in the
rated temperature
range with the
green indicator
ON.
s EXTERNAL DIAGNOSTIC INPUT FUNCTION
To switch the emission off, short-circuit the gray (pink) and the
black (blue) cords of the emitter of the E3S-ATu or the
E3S-ARu with the NPN output feature. For the E3S-ARu with
the PNP output feature, short-circuit the gray (pink) and the red
(brown) cords.
NOTE: IEC colors are shown in parentheses.
16
Light reflected from the floor or the background (diffuse
reflective sensors)
Sensing
object
With the influence of
external noise
Noise
—
Light emission
No emission
Red (Brown) + V
OFF
(with PNP output)
Gray (External-
diagnostic input)
OFF
(with NPN output)
Black (Blue) 0 V
Red (Brown) + V
ON
(with PNP output)
Gray (Pink)
(External-
diagnostic input)
ON
(with NPN output)
Black (Blue) 0 V