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Introduction to Safety
Integrity Level (SIL)
Allen-Bradley Motors
SIL Policy
Topic
Certain catalog numbers of the ControlLogix system (listed in
type-approved and certified for use in SIL 2 applications according to these
standards:
• IEC 61508
• IEC 61511
Approval requirements are based on the standards current at the time of
certification.
These requirements consist of mean time between failures (MTBF), probability
of failure, failure rates, diagnostic coverage and safe failure fractions that fulfill
SIL 2 criteria. The results make the ControlLogix system suitable up to and
including SIL 2.
The TÜV Rheinland Group has approved the ControlLogix system for use in up
to, and including, SIL 2 safety-related applications in which the de-energized
state is typically considered to be the safe state. All of the examples related to I/O
included in this manual are based on achieving de-energization as the safe state
for typical Emergency Shutdown (ESD) Systems.
Rockwell Automation Publication 1756-RM001I-EN-P - May 2012
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Appendix
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