4
OMRON Scientific Technologies Inc.
© OMRON STI 0613 PN99804-0060 Rev. B
16
Table 4-2 Diagram of Operation
4 . 2 F
L O AT IN G
B
L AN KI NG
Warning!
Use of Fixed Blanking and Floating Blanking will make the MS4800 system less
sensitive to objects in the detection zone. Improper use of these features can result in severe
injury to personnel. Fixed Blanking may require a hard barrier guard. Fixed Blanking and
Floating Blanking may require an increase in the safety distance. Read the following section
carefully.
Up to two channels can be obstructed at any location in the detection zone (one channel on MS4800S)
as long as synchronization is maintained, see
Table 4-9
.
This means that an object can freely float from one end of the protective field to the other without the
MS4800 system entering the MACHINE STOP state. The obstructed channels are not fixed at a single
location but “float” through the detection zone.
See
Table 4-3
for a diagram of MS4800 system response during operation with Floating Blanking active.
4.2.1
S
ELECTING
F
LOATING
B
LANKING
WITH
S
EL ECTOR
S
WITCHES
Using the selector switches an authorized user can activate the Floating Blanking function. This allows
the system to operate with one obstructed optical beam anywhere within the protected zone. This
obstruction is permitted anywhere within the protected zone and is permitted to move over time. After
setting the appropriate selector switches, the receiver enters the Power-On Self Test state and if no
faults are detected the receiver shall enter the INTERLOCK or MACHINE RUN condition depending
upon the selected operating mode.
NOTE: Two-beam floating is not available on the MS4800S.
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
▲
!
Blocked Optical Channel
Optical Channel Selected by Fixed Blanking
Clear Optical Channel
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