50 Rockwell Automation Publication 450L-UM001D-EN-P - December 2019
Chapter 4 Safety Function
Figure 24 identifies the spacing and operating distance of a cascaded light curtain
pair.
Figure 24 - Identification of Spacing (S) and Distance (D)
Table 14 - Minimum Spacing Distance (S) between Cascaded Pairs without Optical Barriers
The cascade feature is available for protective field heights of 300 mm (11.81in.)
and longer. 450L transceiver sticks with a length of 150 mm (5.9 in.) cannot be
used as a host pair or a middle pair in a cascaded system. However, a 150 mm
(5.95 in.) 450L-E safety light curtain can be used as the last pair in a cascaded
system.
A maximum of four 450L-E safety light curtains can be interconnected with a
common pair of OSSDs. Each cascaded pair can have a resolution of 14mm
(0.56 in.) or 30 mm (1.19 in.) and a protective field height of up to 1950 mm
(76.77 in). Each cascading pair functions as an independent light curtain.
A cable length between two cascaded sticks must not exceed 10 m (32.8 ft).
ATTENTION: To avoid optical crosstalk (see Mount Multiple 450L
GuardShield Safety Light Curtains on page 79) or optical interference
between the two adjacent pairs, a minimum spacing distance must be
maintained. This minimum spacing distance is a function of the operating
distance D between the transmitter and receiver. The spacing distance, S,
must be larger than 0.026 x D. Figure 24 on page 50
identifies the spacing
distance and operating distance of a cascaded pair. Table 14 on page 50
shows examples of the spacing distance, S, for typical operating distances
when no additional optical barriers are installed between the pairs.
D
[m (ft)]
S
[mm (in.)]
1 (3.28) 26 (1.02)
5 (16.4) 132 (5.2)
10 (32.8) 264 (10.4)
15 (49.2) 393 (15.5)
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