Datalogic SG4 FIELDBUS Series, Instruction Manual, Page: 39 / 136

INSTRUCTION MANUAL 29
CHAPTER 5
ALIGNMENT PROCEDURE
The alignment between the emitting and the receiving units is necessary to obtain the
correct operation of the light curtain.
A good alignment prevents outputs instability caused by dust or vibrations.
The alignment is perfect if the optical axes of the first and the last emitting unit's beams
coincide with the optical axes of the corresponding elements of the receiving unit.
Since the light curtain has two beams for the synchronization, let's call SYNC1 the sync
beam at the bottom, the first beam of the array, and SYNC2 the sync beam on the oppo-
site part of the light curtain, the last beam of the array.
The figure shows that the first beam is located at the bottom edge of the light curtain,
near the LED display.
The last beam is at the opposite end near the terminator cap. These two beams are the
synchronization beams too.
Figure 1 - Description of the beams