Omron Sti F3SJ-A Series User Manual page 71

Reference: Preventing light interference of muting sensor
When a photoelectric sensor is used as a muting sensor, light interference may cause a muting error of F3SJ.
Light interference may occur due to:
Reflected light
A1 B1 F3SJ A2 B2
Workpiece
(1)
(1)
(1) Interference between muting sensors
• Use sensors with mutual interference prevention (such as retro-reflective E3Z-R
• Use laser-type sensors (such as laser-type E3Z-LR
• Take distance from a sensor causing the interference
• Displace beams for each other to prevent interference (change installation height or place them crosswise)
• Install a barrier
• Attach interference prevention filter (provided for E3Z series as accessories)
• Attach a slit to reduce light intensity (provided for E3Z series as accessories)
• Lower the sensitivity
• Reduce a distance between a workpiece and a muting sensor to prevent reflected light from a workpiece
(2) Interference to a muting sensor from F3SJ
• Configure an operating range of F3SJ by the setting tool
• Take distance (D) from a sensor causing the interference
• Displace beams for each other to prevent interference (change installation height or place them crosswise)
• Install a barrier
• Arrange sensors in alternation
• Lower the sensitivity
(3) Interference from a muting sensor to F3SJ
• Use a red LED type sensor (such as retro-reflective E3Z-R
• Use laser-type sensors (such as laser-type E3Z-LR
• Take distance (D) from a sensor causing the interference
• Displace beams for each other to prevent interference (change installation height or place them crosswise)
• Install a barrier
• Arrange sensors in alternation
• Attach a slit to reduce light intensity (provided for E3Z series as accessories)
Mutual interference between a muting sensor and F3SJ in (2) and (3) above can be prevented by
configuring D satisfying a formula shown below:
• If L = 0.2 to 3m D = 0.26m or larger
• If L = 3m or larger D = L x tan5° = L x 0.088m or larger
L : Distance between an emitter and a receiver of F3SJ
D : Distance between a muting sensor and F3SJ
System Configuration and Functions
Direct light
A1 B1 F3SJ A2 B2
Workpiece
(1)
(1)
series)
series)
Light from other F3SJ
A1 B1 F3SJ A2 B2
Workpiece
(2)
(3)
D
series)
series)
User's Manual
E
F3SJ-A
51