Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 21
Chapter 3
Operation
This chapter provides information on the special features and properties of the
450L safety light curtain. It also describes the structure and functions of the unit,
particularly the different operating modes.
Principle of Operation
A functional GuardShield safety light curtain system includes:
• Two transceiver sticks (same length and resolution)
• A transmitter plug-in
•A receiver plug-in
The type of plug-in defines which way a transceiver stick performs: as a
transmitter stick or as a receiver stick. The maximum distance between
transmitter and receiver sticks is referred to as the operating distance or operating
range (see Figure 7
). The GuardShield systems also require a minimum operating
distance. If a system is installed below this distance, the safety outputs do not
switch to on. The maximum operating range is reduced by using deflector
mirrors and/or weld shields.
The protective field height of a GuardShield safety light curtain is equal to the
total length of the stick.
Figure 7 - Principle Operation of a 450L Safety Light Curtain System
A short time after power-up and alignment of a system, nonvisible infrared light
beams build up a plane of detection (protective field) between the two sticks.
The axis of the detection zone is vertical to the front window of the light curtain
sticks.
Detection Zone
Operating Distance
Receiver Stick
Protective Field Height
Connection Plugs of
Inserted Plug-ins
Connection Plugs of
Inserted Plug-ins
Transceiver Stick
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