Panasonic EQ-500 Series - Manual (Page 3)

196
EQ-500
BGS / FGS FUNCTIONS MAKE EVEN THE MOST CHALLENGING SETTINGS POSSIBLE!
The BGS function is best suited for the following case
Background not present
When object and background are
separated
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. Not affected if the background color changes or
someone passes behind the conveyor.
Setting distance
Background
Light received at
element A
Element A
Object Moving object
in the back
Element B
ON OFF
Light received at element
B or light not received
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
FGS (Foreground suppression) function
The sensor judges that no object is present when light is received at position B of
the light receiving element (2-segment element)(The conveyor is detected). This
function is useful if the object and the background are close together or if the
object is glossy or uneven. However, sensing is impossible if there is no
background (conveyor, etc.)..
Conveyor Conveyor Conveyor
Light received
at element A Light is not received at
element B, so an object
is judged to be present Light received at element B
Element A
Lens
Emitting
element
For glossy
object
Object present Object absent
OFF in this condition only ON in all other conditions
ON ON OFF
Element B
Setting
distance
A conveyor or other
background must be present.
08/2005