Datalogic SG4 FIELDBUS Series, Instruction Manual, Page: 27 / 136

GENERAL INFORMATION ON DEVICE POSITIONING
INSTRUCTION MANUAL 17
Emitter and receiver orientation
The two units shall be assembled parallel each other, with the beams arranged at right
angles with the emission and receiving surface, and with the connectors pointing to the
same direction.
The configurations shown in the figure must be avoided:
Figure 10 - Wrong light curtain TX-RX orientations
Use of deviating mirrors
The control of any dangerous area, with several but adjacent access sides, is possible
using only one safety device and well-positioned deviating mirrors.
The figure shows a possible solution to control two different access sides, using one mir-
ror placed at 45° with respect to the beams.
Figure 11 - Use of deviating mirrors
The operator must respect the following precautions when using the deviating mirrors:
• The alignment of the emitter and the receiver can be a very critical operation
when deviating mirrors are used. Even very small displacements of the mirror is
enough to lose alignment.
• The use of DATALOGIC laser pointer accessory is recommended under these condi-
tions.
• The minimum safety distance (S) must be respected for each single section of the
beams.
• The effective operating range decreases by about 20% by using only one deviating
mirror.
The following table shows estimated operating distances relating to the number of mir-
rors used.
0 7 m 20
1 5.6 m 16
• The presence of dust or dirt on the reflecting surface of the mirror causes a drastic
reduction in the range.
NO. OF MIRRORS OPERATING DISTANCE (14mm) OPERATING DISTANCE (30mm)