10
Fixed Blanking Section 5-1
The effect of this tolerance also allows the number of blocked beams to vary
±1. For example, a Fixed Blanked area of 8 blanked beams is allowed to
increase to 9 beams or decrease to 7 beams and the light curtain will remain
in MACHINE RUN.
There is an exception when there is only one clear beam separating Fixed
Blanked areas. For only this case, there is no positional tolerance allowed on
that side of the clear beam for the object closest to the entry endcap so that
clear beam can only be used by the object further away from the entry end-
cap. See the following table:
The minimum number of beams in a Fixed Blanking area is one. If only one
beam is blanked, the number of blocked beams has a size tolerance of +1/-0
meaning the number of blocked beams can increase to two but the area can-
not be completely eliminated.
The Fixed Blanking pattern must not prevent the light curtain from synchroniz-
ing. This means that the size of the blanked object can not exceed certain lim-
its as long as synchronization is maintained.
Fixed Blanking is allowed during all modes of operation (automatic start, start
and start/restart interlock).
No Fixed
Blanking
Fixed
Blanking
Enabled
Fixed
Blanking
Enabled
Fixed
Blanking
Enabled
Fixed
Blanking
Enabled
Fixed
Blanking
Enabled
MACHINE
STOP
MACHINE
RUN
MACHINE
RUN
MACHINE
RUN
MACHINE
STOP
MACHINE
STOP
Clear Optical
Channel
Blocked Optical Chan-
nel
Optical Channel
Selected by Fixed
Blanking
Opposite to entry endcap end
Fixed blanking enabled Fixed blanking enabled Fixed blanking enabled
MACHINE RUN MACHINE RUN MACHINE STOP
Entry endcap end
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