Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 73
Installation and Wiring Chapter 6
Minimum Distance from Reflective Surfaces
The infrared light that is transmitted from the two transceivers can be reflected
off shiny surfaces. If this condition occurs, it can result in an object not being
detected when it enters the GuardShield safety light curtain sensing field.
All reflecting surfaces and objects (for example, material bins) must, therefore, be
at a minimum distance A from the protective sensing field of the system. The
minimum distance A depends on the distance (D) between the two transceivers.
Figure 34 - Minimum Distance A from Reflective Surfaces (Top View)
Figure 35 - Minimum Distance A from Reflective Surfaces (Side View)
The minimum distance from the reflective surfaces can be determined as follows:
• Determine the distance D [m] between transmitter and receiver
• Read the minimum distance A [mm] from the graph:
Figure 36 - Minimum Distance A from Reflective Surfaces (D= Distance between Receiver and
Transmitter)
D [m]
35 10
A [mm]
300
400
500
200
100
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