Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 17
Chapter 2
Safety Concepts
This section describes the safety Performance Level concept and explains how the
450L safety light curtains meet the requirements for SIL 3 and PLe for
Category 4 architectures.
Safety Standards Applied
to GuardShield
The 450L safety light curtain satisfies applicable requirements in the following
standards that are related to functional and machinery assembly:
• IEC 61496-1/-2 (Type 4)
• IEC 61508 (SIL 3)
• IEC 62061 (SIL CL 3)
• EN/ISO 13849-1 (Performance Level e (PLe), Category 4)
• UL 508
The 450L-E safety light curtain satisfies applicable requirements that are
provided in IEC 60825-1 for the integrated laser alignment aid (see Laser
Alignment on page 24).
Published dates of the individual standards are given in the Declaration of
Conformity (see rok.auto/certifications
).
Functional Safety Data
The functional safety data are listed in Table 70 on page 189. These values refer
to the longest light curtain system length (1950 mm [76.77 in.]) with the
smallest resolution (14 mm[0.55 in.]).
For cascaded 450L-E safety light curtain applications, the final PFH value of the
complete system is the sum of the individual PFH values of each pair plus the sum
of the PFH values of the cascading plug-in.
The following example (Figure 6 on page 18
) shows the calculation of the PFH
of a cascaded system with 450L-E safety light curtain and two cascading plug-ins.
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