Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 51
Safety Function Chapter 4
If a 450L-E safety light curtain transceiver with an installed 450L-APC-IO-8
cascading plug-in is used as a standalone light curtain pair or as the last segment
in a cascaded system, the cascading plug-in must be terminated:
• Use termination plug 898D-81CU-DM
(1)
at the cascading plug-in of a
transceiver working as an Rx.
• Use termination plug 898D-81CU-DM or M12 sealing cap
(1485A-M12) at the cascading plug-in of a transceiver working as a Tx.
Figure 25 - Cascaded System with 450L-APC-IO-8 as Last Module
If a 450L-E stick, which operates as a receiver with a 450L-APC-IO-8 cascading
plug-in, the corresponding transmitter, can but does not require, a
450L-APC-IO-8 cascading plug-in to be installed (see Figure 26
).
Figure 26 - Cascaded System
Cascaded system with three pairs and only two 450L-APC-IO-8. Supply power
for all transmitters that are wired separately.
Manual start modes and relay monitoring (EDM) are not available on cascaded
middle and end pairs of a cascading 450L system with DIP switch configuration.
However, it is possible to configure these operating modes at the receiver of the
host pair and allow the whole cascading system to operate in these modes.
For features like beam coding or blanking, each cascaded pair has to be
configured separately.
For two-sensor muting applications, the muting function applies to the cascaded
system. Four-sensor muting cannot be applied to cascaded systems.
(1) The termination plug has three pins that are shorted together (pins 2, 5, and 6). It is only needed on the receiver side.
Pair 1 Pair 2
1485A-M12
898D-81CU-DM
Cascade
Plug-in 1
Cascade
Plug-in 2
Rx
Tx
Pair 1 Pair 2
Rx
Tx1
Pair 3
Tx3
Tx2
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