Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 49
Safety Function Chapter 4
Figure 23 - Nomenclature for Cascaded Design
Nomenclature that is used for a cascaded design (example for a cascaded system
with three cascaded pairs).
The first pair in a cascaded system is called the host pair. The OSSD outputs of
the host pair are connected to safety contactors, a safety relay, or a safety PLC.
Cascading allows the 450L-E safety light curtain to help protect multiple sides of
a machine and to connect the complete design with only two OSSD safety
outputs to the machine safety control.
See Cascading Application on page 207
for a typical application with cascading.
Cascaded Host Pair
Cascaded Host Stick
Cascaded System
Cascaded Units
Cascaded Stick
Pair 1 Pair 2 Pair 3
Cascaded Pair
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