6.3.7 Fixed Blanking
Fixed blanking disables beams that would otherwise be continually blocked by a stationary object, such as tooling. One or
multiple areas within an EZ-SCREEN LPM sensor pair may be “blanked out,” with a minimum of one beam between two
blanked areas. Any beam other than the sync beam may be blanked. All beams of a fixed blanked area must remain
blocked during operation for the OSSDs to stay ON.
A flashing green Zone indicator denotes the location of a blanked area. If the object is either moved or removed, the System
goes into Lockout mode, ensuring that an unexpected hole in the sensing field is not created.
Configure Fixed Blanking
1. From either normal operation or a power Off condition, set the first and second DIP switches (T/L and Red Res) both
to the left (Trip operation and Reduced Resolution enabled positions). See
(p. 64).
2. Set the third and fourth DIP switches (the second T/L and Red Res) both to the right (Latch operation and Reduced
Resolution Off positions). The receiver should now either be in a lockout condition or power is still Off.
1. With Power On: Position object(s) in the defined area.
2. Set T/L and Red Res switches as shown (do not
change SC2/SC1 or E1/E2 switch positions).
3. Press the Reset button or cycle power.
4. Reconfigure DIP switches for normal operation.
5. Press the Reset button or cycle power.
Figure 22. DIP switch configuration to teach fixed blanking
3. If power is Off: Apply power.
In a lockout condition: Perform a valid reset sequence (close the reset switch for 0.25 to 2 seconds, then reopen it).
4. Observe the Fixed Blanking configuration, which is indicated by:
• Display sequentially displays “PFA” (program fixed blanking active) and the number of blocked beams (“0” if
all beams are clear).
• Zone indicators active
• Reset indicator Off
• Status indicator On Red
5. Position the object(s) to be blanked (or remove the objects that will no longer be blanked).
Note: When any beams are blocked, the 7-segment display sequentially displays “PFA” and the
number of blocked beams. The zone indicators remain active and denote the location of blocked
beams.
6. To teach the blanked beams, re-configure DIP switches for normal operation (see
(p.
64)).
7. Verify that only the objects to be blanked are interrupting the defined area. A lockout will occur if an object is moved
or removed after teaching.
The receiver indicates:
• Display: sequentially displays “PFC” (PFC = Program Fixed Blanking Complete)
• Zone indicators flash approximate location of fixed blanked area programmed
• Reset indicator single-flashing Yellow
• Status indicator single-flashing Red
8. Perform a valid reset sequence (see Step 3) or cycle power.
9. To disable fixed blanking, follow this same procedure, but remove all objects not to be blanked at Step 5.
EZ-SCREEN Low-Profile System with Integral Muting
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