56 Rockwell Automation Publication 450L-UM001D-EN-P - December 2019
Chapter 4 Safety Function
Cascading Response Time, Tc
The response time of a cascaded light curtain is simply an additional adder due to
the cascading plug-in (450L-APC-IO-8). The adder must take into
consideration the total number of cascading plug-ins between the cascaded stick
and the host stick. Therefore, the total response time is calculated as such:
Tc = 6 ms
Standard Features: Tr = Ts + (n x Tc)
Advanced Features: Tr = Ta + (n x Tc)
Figure 27 on page 57
shows an example with three pairs of light curtains. The
cascading adder for Pair 1 is zero, as Pair 1 is the host. Pair 2 has one cascading
plug-in between itself and the host, so the additional adder is 6 ms. Pair 3 has two
cascading plug-ins between itself and the host, so the additional adder to the
response time is 12 ms.
Hand Resolution
150 (5.91) 21 22
300 (11.81) 23 24
450 (17.72) 25 27
600 (23.62) 26 28
750 (29.53) 31 34
900 (35.43) 32 35
1050 (41.34) 32 35
1200 (47.24) 33 36
1350 (53.15) 47 51
1500 (59.06) 47 51
1650 (64.96) 47 51
1800 (70.87) 47 51
1950 (76.77) 48 52
Table 18 - Response Time, Ta (Set by Connected Components Workbench Software Configuration)
Response Time, Ta, (ms)
Protective
Height [mm (in)]
Reduced Resolution (Floating Blanking),
single beam
Reduced Resolution one object outside
the blanked zones
Reduced Resolution (Floating Blanking),
single beam
Reduced Resolution one object outside
the blanked zones, with Beam Coding
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