Panasonic EQ-500 Series manual Background not present, Background present

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 BGS (Background suppression) function

When object and background are separated

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.

	OFF	ON
Light received at element		Light received at
B or light not received		element A
		Element A
Background		Element B
	Moving object	Object
	in the back
	Setting distance

The FGS function is best suited for the following case

Background present	FGS (Foreground suppression) function
When object and background are close	The sensor judges that no object is present when light is received at position B of
together	the light receiving element (2-segment element)(The conveyor is detected). This
When the object is glossy or uneven	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.)..

OFF in this condition only

Object absent

OFF

Element A

Emitting

element

Element B Lens

Conveyor

Light received at element B

A conveyor or other background must be present.

ON in all other conditions

Object present	For glossy
	object
ON	ON

Setting distance

Conveyor	Conveyor
Light received	Light is not received at
at element A	element B, so an object
	is judged to be present

196 08/2005