E3X-DA11-N Datasheet, PDF (31/36 Pages) Omron Electronics LLC – The Ultimate Fiber Amplifier for Maximum Ease of Use and High Performance

Photoelectric Sensors Technical Guide
Precautions for Correct Use
● Design
Power Reset Time
The Sensor will be ready to detect within approximately 100 ms after
the power is turned ON.
If the Sensor and the load are connected to separate power supplies,
turn ON the Sensor power before turning ON the load power. Any
exceptions to this rule are indicated in Safety Precautions in individual
product information.
Turning OFF Power
An output pulse may be generated when the power is turned OFF. It
is recommended that the load or load line power be turned OFF
before the Sensor power is turned OFF.
Power Supply Types
An unsmoothed full-wave or half-wave rectifying power supply cannot
be used.
Mutual Interference
Mutual interference is a state where an output is unstable because the Sensors are affected by light from the adjacent Sensors.
The following measures can be taken to avoid mutual interference.
Counter-
measure
Concept
Through-beam Sensors
Reflective Sensors
Use a Sensor If Sensors are mounted in close proximity, use Sensors with the interference prevention function.
with the
10 or fewer Sensors: E3X-DA@-S, E3X-MDA, E3C-LDA Fiber Sensors
interference
Performance, however, will depend on conditions. Refer to pages E3X-DA-S/E3X-MDA
1
prevention
function.
and E3C-LDA.
5 or fewer Sensors: E3X-NA Fiber Sensors
2 or fewer Sensors: E3T, E3Z, E3ZM, E3ZM-C, E3S-C, E3G-L1/L3, or E3S-C Built-in Amplifier Photoelectric
Sensors (except Through-beam Sensors)
E3C Photoelectric Sensor with separate amplifier
Install an
A mutual interference prevention polarizing filter can be
2
inference
prevention
installed on only the E3Z-TA to allow close-proximity
mounting of up to 2 Sensors.
---
filter.
Mutual Interference Prevention Polarizing Filter: E39-E11
Separate
Check the parallel movement distance range in the If the workpieces move from far to near, chattering may
Sensors to
catalog, verify the set distance between adjacent
occur in the vicinity of the operating point. For this type of
distance where Sensors, and install the Sensors accordingly at a
application, separate the Sensors by at least 1.5 times the
interference distance at least 1.5 times the parallel movement
operating range.
does not occur. distance range.
1.5 × L
3
Workpiece
Workpiece
Sensor
Alternate
Emitters and
Receivers.
Close mounting of Sensors is possible by alternating
the Emitters with the Receivers in a zigzag fashion (up
to two Sensors). However, if the workpieces are close
to the Photoelectric Sensors, light from the adjacent
Emitter may be received and cause the Sensor to
change to the incident light state.
Emitter
4
Workpiece
Receiver
Receiver
L
Sensor
---
Emitter
Offset the
If there is a possibility that light from another Sensor If Sensors are mounted in opposite each other, slant the
optical axes. may enter the Receiver, change the position of the Sensors as shown in the following diagram. (This is
Emitter and Receiver, place a light barrier between the because the Sensors may affect each other and cause
Sensors, or take other measures to prevent the light output chattering even if separated by more than the
from entering the Receiver.
Sensor sensing distance.)
5
(Light may enter even if the Sensors are separated by
more than the sensing distance.)
Sensor
θ
Sensor
θ
6
Adjust the
sensitivity.
Lowering the sensitivity will generally help.
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