30 Rockwell Automation Publication 450L-UM001D-EN-P - December 2019
Chapter 4 Safety Function
Beam Coding
Beam coding is only configurable for 450L-E safety light curtain.
If several safety light curtains are operating close to one another, it is possible that
the transmitter infrared light from one 450L-E safety light curtain system is seen
by another 450L-E safety light curtain receiver (optical cross talk, see Mount
Multiple 450L GuardShield Safety Light Curtains on page 79). This situation
can cause an unsafe installation. To reduce the probability of this situation, the
450L-E safety light curtain is able to exchange the addresses of the sticks that are
paired and to generate different transmitter pulse pattern, which is referred to as
beam coding.
Two settings are available in the 450L-E safety light curtain —non-coded and
coded. The factory default is non-coded.
If beam coding is selected, a teach-in procedure at the transmitter and the
corresponding receiver must be performed once for pairing the two sticks.
The pairing procedure for systems out of the box is only required at the Rx and at
the Tx transceiver stick when the beam coding function was selected. It must only
be done once after the first power-up.
Set beam coding with the appropriate DIP switch on the plug-in of the receiver
(Rx) stick and power the system up. A confirmation of the configuration can be
required first at the receiver (Rx), if the Rx stick was operated before. In this case,
perform first the configuration confirmation at the Rx and then the confirmation
for the pairing.
When the STS status indicator at the transmitter is blinking red/green, it
indicates that the Tx stick beam coding must be paired with the Rx stick. Follow
the procedure that is described in Confirmation of a New System Configuration
on page 64.
Blanking and Reduced
Resolution
Blanking and reduced resolution is only configurable for 450L-E safety light
curtain.
Blanking and reduced resolutions are typically used to allow objects wider than
the optical resolution to stay in or to pass through the protective field during
normal operation without causing a fault or stop condition (for blanking
application, see Fixed Blanking Application on page 206
).
ATTENTION: If several systems are in the area, only one single transmitter is
allowed to be paired with a given receiver. Make sure that any other adjacent
installed safety light curtain system is switched off during the pairing
process.
The beam coding settings do have an impact on the response time (see
Response Time on page 52
).
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