Table of Contents
Advertisement
9 Blanking
NB!
– Use of Blanking will change the resolution of the light curtain.
Improper use of this feature can result in severe injury to personnel.
– Blanking may require an additional fixed guard.
– Blanking may require an increase in the safety distance.
Read the following section carefully.
A selectable number of optical beams can be obstructed at any location in the detection zone as long as the
optical synchronization is maintained.
The beam opposite side to the connector end-cap is used for optical synchronization and cannot be
blanked.
An object can freely f l oat from one end of the protective f i eld to the other without the Focus II system
entering the stop state. The obstructed beams are not f i xed at a single location but "f l oat" through the
detection zone. It is possible to have multiple blanked areas of different sizes.
Setting of Blanking is done by a teach-in or with BP-1 see 9.1.
When blanking is used, the blanked area must be continuously and entirely occupied by material, fixtures,
fixed guards or removable interlocking guards.
Example using additional mechanical
guarding:
Where
1
= part that permanently blocks 3 beams,
eg. a support table
2
= area that needs additional mechanical
guard
There are two limitations for the Blanking function:
1.
Maximum percentage of blanked beams out of total beams is 30%
2.
Maximum number of blanked beams is 21.
The Blanking function is active as long as the beams obstructed during the teach-in remain blocked. If the
number of beams obstructed is higher or lower, the Focus II system will change to ERROR state with the
LED 2 and 4 blinking. To reset this error, press and release the TEST/RESET pushbutton when the object
is in the detection zone again.
Blanking function can be used in combination with T muting of all beams or L muting of all beams (see 4.4),
as long as a muting indicator is connected.
2TLC172015M0201, rev. D
2
36
2
1
www.abb.com/lowvoltage
Advertisement
Table of Contents
