Self-Diagnosis Function - Panasonic SU-7 Series Manual

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
ON
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
ON
Sensing output
OFF
in the Dark-ON
mode
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.
ON-delay
As only longer
signals are extracted,
this function is useful
for detecting if a line
is clogged, or for
sensing only objects
taking a long time to
travel.
OFF-delay
Since the output
signal is extended for
a fixed time interval,
this function is useful
if the output signal
is so short that the
connected device
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.
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Slim Body Automatic Sensitivity Setting Photoelectric Sensor
Gate trigger
ON
OFF
High
Low
T T
ON
40 ms approx.
OFF
T ≥ 0.6 ms
T T T
T ≥ 0.8 ms
when the interference
prevention function
is used
Normal Failure
Sensing
condition
Operation
Normal
operation
ON-delay
T
OFF-delay
T T
Normal
operation
ON-delay
T T
OFF-delay
T
Timer period: T = 0 to 5 sec.
5 sec.
5 sec.

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.
Sensing condition
Sensing output
(operation indicator)
(in the Light-ON mode)
Stability indicator
Self-diagnosis output
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
Sensing
Non-
sensing
ON
Amplifier
OFF
ON
OFF Place a ferrite core near the amplifier.
In that condition, the sensor head cable should be single-winding.
ON
T
Prepare 1 pc. of the following recommended ferrite core (or an
OFF
equivalent product.)
ON
<Recommended product>
ESD-SR-110 [NEC TOKIN Corporation]
OFF
ON
Others
T
OFF
• Do not use during the initial transient time (0.5 sec.) after
ON
the power supply is switched on.
OFF
ON-delay
OND
0 sec.
0
OFD
OFF-delay
SU-7 SH
SERIES
Insufficient beam intensity Insufficient beam interruption
1 1
2
40 ms approx.
When sensor head is
reflective type
Sensor head
Amplifier
Ferrite core
13
SERIES
Stable light received level
Sensing output threshold level
Stable dark level
ON (Lights up)
OFF (Lights off)
Lights up
Lights off
ON
3
OFF
40 ms approx.
Sensor head
Ferrite core