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OMRON Scientific Technologies Inc.
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© OMRON STI 0613 PN99804-0060 Rev. B
Table 4-1
Tolerance Effect of Fixed Blanked area on Resolution
Note:
The tolerance does not reduce the resolution of the entire light curtain, only the ends of Fixed
Blanked Areas. The user must consider the increased resolution of the two beams at the ends of each
Fixed Blanked Area.
The minimum number of beams in a Fixed Blanking area is one. If only one beam is blanked,there is
no positional tolerance. The beam programmed to be blocked must remain blocked. 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 cannot be completely eliminated.
The Fixed Blanking pattern must not prevent the light curtain from synchronizing. This means that the
size of the blanked object can not exceed certain limits as long as synchronization is maintained, see
Table 4-9
.
Fixed Blanking is allowed during all modes of operation (Automatic Start, Start, Start Interlock, and
Start/Restart Interlock.)
To use Fixed Blanking, the operator enables the option using the selector switches. A new Fixed
Blanking pattern is recorded when the MS4800 receiver is in MACHINE STOP, the blanking function
is active and the Program function is activated. If the Fixed Blanking feature is disabled, the stored
protected zone patterns are cleared.
4.1.1
S
ELE CTING
F
IXED
B
L ANKING
WITH
S
ELECTO R
S
WITCHES
The obstruction is placed within the detection zone and the receiver goes to MACHINE STOP state.
An authorized user then sets the selector switches in the receiver endcap to select Fixed Blanking
Enable. The MS4800 enters a fault state and power is cycled or the Start switch is activated to clear the
fault. When the receiver powers up it will be in Fixed Blanking mode with the red and amber LEDs lit.
See Figure 4-2
Selecting Fixed Blanking Procedure 1
.
Figure 4-2 Selecting Fixed Blanking Procedure 1
The authorized user then enables the Program switch by setting both Fixed Blanking switches to the off
position and then both to the on position. When the first Fixed Blanking switch is flipped, the red LED
begins flashing at a rate of 3 Hz. When the final Fixed Blanking switch is flipped, both the red and
amber LEDs and the IBIs of the blocked beams start flashing to indicate the Program switch is enabled.
Standard Resolution
Effective Resolution at Ends of Fixed Blanked Area
14mm
34mm
20mm
40mm
30mm
60mm
40mm
80mm
IBIs of blocked
beams are On.
Amber LED turns on to indicate
in Fixed Blanking mode.
3
2
1
5
4
6
3
2
1
5
4
6
ON
ON
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