Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 193
Chapter 13
SIL 2 Certification
Introduction to SIL
Certain catalog numbers of the ControlLogix system are type-approved and
certified for use in SIL2 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
SIL2 criteria. The results make the ControlLogix system suitable up to, and
including, SIL2. When the ControlLogix system is in the Maintenance or
Programming mode, the user is responsible for maintaining a safe state.
The TÃœV 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.
In addition, specific configuration and programming considerations described in
the Using ControlLogix in SIL2 Applications Safety Reference Manual,
publication 1756-RM001
, must be made.
Programming and Debugging Tool (PADT)
For support in creation of programs, the Programming and Debugging Tool
(PADT) is required. The PADT for the ControlLogix system is RSLogix 5000
software, per IEC 61131-3, and the Using ControlLogix in SIL2 Applications
Safety Reference Manual, publication 1756-RM001
.
Topic Page
Introduction to SIL 193
Programming and Debugging Tool (PADT) 193
Typical SIL2 Configurations 194
Additional Resources 198
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