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PRECAUTIONS FOR PROPER USE
Amplifier
External synchronization function (SU-75 only)
• The external synchronization function can be used to
control the timing of sensing. Edge trigger or gate trigger
are available.
Edge trigger
ON
OFF
High
Low
T
ON
40 ms approx.
OFF
T ≥ 0.6 ms (T ≥ 0.8 ms when the interference prevention function is used)
Note: The external synchronization selection switch must be turned fully
clockwise or counterclockwise.
Test input (emission halt) function (SU-75 only)
• When the test input (emission halt input) (violet) is short-
circuited to 0 V (Low), the beam emission is halted. This
function is useful for a start-up test since the sensing output
can be made ON/OFF without the sensing object. Short-circuit
to 0 V and open the input, repeatedly. If the sensing output
follows this operation, the sensor is working well, else not.
High
Test input
(emission halt input)
Low
T
ON
Sensing output
OFF
in the Dark-ON
mode
Normal
Timer function (Excluding SU-75)
• Every SU-7 series amplifier (excluding SU-75) is incorporated
with a variable ON/OFF delay timer for 0 to 5 sec.
Sensing
ON-delay
condition
As only longer
Operation
signals are extracted,
Normal
this function is useful
operation
for detecting if a line
is clogged, or for
sensing only objects
ON-delay
taking a long time to
travel.
OFF-delay
OFF-delay
Since the output
Normal
operation
signal is extended for
a fixed time interval,
this function is useful
ON-delay
if the output signal
is so short that the
connected device
OFF-delay
cannot respond.
• Timer period setting
Adjust the time duration of ON or OFF
delay by turning the timer adjuster.
Note: Adjust the timer under "SET" mode. Adjustment
is not allowed in "SIF" or "RUN" mode.
Slim Body Automatic Sensitivity Setting Photoelectric Sensor
Gate trigger
ON
OFF
High
Low
T
ON
OFF
T ≥ 0.6 ms
T
T
T ≥ 0.8 ms
when the interference
prevention function
is used
Failure
Sensing
Non-
sensing
ON
OFF
ON
T
OFF
ON
T
T
T
OFF
ON
OFF
ON
T
T
T
OFF
ON
T
OFF
Timer period: T = 0 to 5 sec.
ON-delay
5 sec.
OND
0 sec.
0
OFD
5 sec.
OFF-delay
SU-7
Self-diagnosis function
• The sensor checks the incident light intensity, and if it is
reduced due to dirt or dust, or beam misalignment, an
output is generated.
Insufficient beam intensity
Sensing condition
Sensing output
(operation indicator)
(in the Light-ON mode)
Stability indicator
1
Self-diagnosis output
2
40 ms approx.
The self-diagnosis output transistor stays in the "OFF"
1
state during stable sensing.
When the sensing output changes, if the incident light
2
intensity does not reach the stable light received level or
the stable dark level, the self-diagnosis output becomes
ON. It is automatically restored after 40 ms approx.
Further, the self-diagnosis output changes state when the
sensing output changes from Light to Dark state.
It is not affected by the output operation of the sensing
output.
In case of insufficient beam interruption, there will be a
3
time lag before the self-diagnosis output turns ON.
Use conditions to comply with CE Marking
(SH-3□ only)
• Following work must be done in cace of using this
product as a CE marking (European standard EMC
Directive) conforming product.
Place ferrite core at the sensor cable.
When sensor head is
thru-beam type
Sensor head
Amplifier
Ferrite core
Place a ferrite core near the amplifier.
In that condition, the sensor head cable should be single-winding.
Prepare 1 pc. of the following recommended ferrite core (or an
equivalent product.)
<Recommended product>
ESD-SR-110 [NEC TOKIN Corporation]
Others
• Do not use during the initial transient time (0.5 sec.) after
the power supply is switched on.
SH
SERIES
SERIES
Insufficient beam interruption
Stable light received level
Sensing output threshold level
Stable dark level
ON (Lights up)
OFF (Lights off)
Lights up
Lights off
ON
1
3
OFF
40 ms approx.
When sensor head is
reflective type
Sensor head
Amplifier
Ferrite core
13
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