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Troubleshooting
Errors and Countermeasures
Error Cause Countermeasure
Detection Detection is made (the output
indicator illuminates in orange)
even though no object is present.
Light from an adjacent fiber unit is
received.
• When an inter-connection main
unit and expansion units are
connected, cross talk prevention
eliminates interference between
the units. (Response time and
number of units with cross talk
prevention: page 3-40)
• Install adjacent fiber units with
sufficient space between them.
Also, install the fiber units so
that the emitters and receivers
alternate. (With a through-beam
fiber unit.)
Detection is not made (the output
indicator [orange] turns off) even
though an object is present.
• The threshold setting is too high
or the sensing distance is too
short. (With a diffuse reflective
fiber unit.)
• The threshold setting is too low
or, in the case with a
transparent object, the
transparency is too high. (With
a through-beam fiber unit.)
• Decrease the threshold. (With a
diffuse reflective fiber unit.)
• Increase the threshold. In the
case of highly transparent
objects, replace the fiber unit
with a retro-reflective fiber unit.
(With a through-beam fiber
unit.)
The manual adjustment of
threshold with the [+] and [−] keys
is not correct.
Readjust the threshold with the
[+] and [−] keys or execute the
teach again to set the threshold to
the correct value.
Reflected light from an object with
high reflectivity is oblique to the
optical axis, thus it does not reach
a receiver. (With a diffuse
reflective fiber unit.)
Change the installation position
and angle so that the light axis is
perpendicular to the object.
The fiber wires are inserted to the
product incorrectly or the fiber
cores are broken.
• Check the fiber insertion
indicators of the product. If a
white insertion indicator is
displayed, reinsert the fiber to
turn off the indicators.
• If the fiber wires are broken,
replace the fiber unit.
Light from an adjacent fiber unit is
received.
• When an inter-connection main
unit and expansion units are
used, cross talk prevention
eliminates interference between
the units. (Response time and
number of units with cross talk
prevention: page 3-40)
• Install adjacent fiber units with
sufficient space between them.
Also, install the emitters and
receivers of fiber units
alternately. (With a through-
beam fiber unit.)
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