80 Rockwell Automation Publication 450L-UM001D-EN-P - December 2019
Chapter 6 Installation and Wiring
Measures to avoid optical interference or optical cross talk are:
1. Minimum installation distance S between adjacent installed pairs (see
Table 14 on page 50
).
2. Installation of optical barriers (see Figure 48 on page 81
).
For 450L-E safety light curtains, a measure to help prevent optical cross talk is
also the beam code function (see Beam Coding on page 30
). The beam code
function helps prevent optical cross talking. It also reduces the probability for
optical interferences but it does not fully stop them.
Figure 46 - Two Adjacent Installed Pairs without Optical Crosstalk
Figure 47 - Two Adjacent Installed Pairs with Optical Crosstalk
Figure 48 on page 81 shows a number of installation techniques to stop optical
interference or optical crosstalk between adjacent light curtains.
• Check that the maximum operation range can be reduced (see Low
Operating Range on page 29).
• Install mechanical (optical) barriers to help prevent optical interference
(Figure 48
).
ATTENTION: Cross talking between adjacent installed pairs can cause an
unsafe situation.
Rx (2)
Rx (1)
Tx (1) <-> Rx (1)
Tx (2) <-> Rx (2)
Tx (1)
Tx (2)
Rx (2)
Rx (1)
Tx (1) <-> Rx (2)
Tx (2) <-> Rx (1)
Tx (1)
Tx (2)
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