Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 71
Installation and Wiring Chapter 6
Example for Dpf
The Dpf can be approximated in a perpendicular safety-light curtain application
with object sensitivity (effective resolution) less than 63.5 mm (2.5in.):
Dpf (inches) = 3.4 × (Object Sensitivity [inch] – 0.276 [inch]), but
not less than 0.
Table 28 - Depth of Penetration Factor
European Safety Distance Formula
A safety distance must be maintained between the light curtain and the point of
danger (Figure 35 on page 73
), as described in IEC/TS 62046. This safety
distance helps confirm that the point of danger can only be reached after the
dangerous state of the machine has been removed.
The safety distance as defined in EN ISO 13855 and EN ISO 13857 depends on:
•Machine stop time
• Response time of the protective device (safety light curtain + control
circuit)
• Resolution of the safety light curtain
• Approach speed to the danger point
• Position of the AOPD
Figure 33 - Safety Distance from the Point of Danger to the Light Curtain
Description Depth Penetration Factor
Finger resolution (14 mm [0.56 in.]) 23.7 mm (0.935 in.)
Hand resolution (30 mm [1.19 in.]) 78.1 mm (3.077 in.)
Safety
Distance
Protective
Height
Point of
danger
≤75 mm (2.95 in.)
To avoid the possibility of standing between the
protective field and the point of operation,
≤75 mm (2.95 in.) distance must be maintained.
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