Panasonic CX-400 Series, Руководство пользователя

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6
Compact Photoelectric Sensor
CX-400
SERIES Ver.2
BGS/FGS functions make even the most challenging settings possible!
FUNCTIONS
CX-44 □
FGS (Foreground suppression) function
Light received
at position A
Light is not
received at
position B, so a
object is judged
to be present
Light received
at position B
For glossy object Object absent
OFF in this condition only ON in all other conditions
The sensor judges that an object is present when no
light is received at position B of the light-receiving
element (2- segment element). Accordingly, even
objects that are glossy can be sensed. This is useful if
the object and background are close together, or if the
object being sensed is glossy.
Conveyor Conveyor Conveyor
A
Lens
Emitting
element
ON ON OFF
B
Setting
distance
A conveyor or
other
back-ground
must be present
Object present
Setting distance
Object Moving object
in the back
Background
ON OFF
Light received at
element B, or
light not received
Element B
(Light received at element A)
Element A
BGS (Background suppression) function
The sensor judges that an object is present when light
is received at position A of the light-receiving element
(2-segment element).
This is useful if the object and background are far
apart. The distance adjustment method is the same as
the conventional adjustment method for adjustable
range reflective type sensors.
Strong against interference
The interference prevention function lets two sensors to
be mounted close together precisely.
Interference
prevention
filter (Optional)
Thru-beam type
Only CX-411
Automatic
interference
prevention function
Retroreflective type
Diffuse reflective type
Adjustable range reflective type
Not affected if the background
color changes or someone
passes behind the conveyor.
Unaffected by gloss, color or
uneven surfaces when sensing
objects present on a conveyor belt.
The BGS function is best suited for the following case
Background not present
When object and background are separated
The FGS function is best suited for the following case
Background present
When object and background are close together
When the object is glossy or uneven
BGS
FGS
Caution: Please use the FGS function together with a conveyor or other
background unit.