18 Rockwell Automation Publication 450L-UM001D-EN-P - December 2019
Chapter 2 Safety Concepts
Figure 6 - Example and PFH Calculation of Cascaded Systems
PFH (total) = 3x PFH (450L pair) + 2 x PFH (cascading plug-in)
Safety Certification
Each 450L safety light curtain is a Type 4 ESPE as defined by IEC61496-1 and
CLC/TS 61496-2. The safety light curtains are allowed for use with controls in
compliance with these certifications.
• PLe (in a Category 4 architecture) in compliance with EN ISO 13849
• SIL CL3 in accordance with EN 62061
• SIL 3 in accordance with IEC 61508
Safety requirements are based on the standards applicable at the time of
certification with a proof test interval of 20 years.
The device is suitable for the following:
• Point of Operation Control (POC) finger- and hand-detection
• Hazardous area protection
• Access protection
Access to the hazardous point must be allowed only through the protective field.
The machine/system is not allowed to start as long as personnel are within the
hazardous area (see Correct Installation on page 77
).
Depending on the application, mechanical protective devices are potentially
required in addition to the safety light curtain.
TÜV Rheinland has approved the 450L GuardShield safety light curtains for use
in safety-related applications where Performance Level (PL) up to e and safety
integrity level up to SIL 3 are required.
TÜV Rheinland confirmed that the integrated laser alignment aid in 450L-E
GuardShield safety light curtains conforms to the classification of laser class two
according to IEC 60825-1.
IMPORTANT For 450L-E safety light curtains, if cascading the PFH of each cascade and
each cascading plug-in must be considered.
Pair 1 Pair 2 Pair 3
Cascading
Plug-in 1
Cascading
Plug-in 2
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