1756-RM093F-EN-P, GuardLogix Controller Systems ... - Tuv-fs.com

Chapter 1
Safety Integrity Level (SIL) Concept
Introduction
This chapter introduces you to the Safety Integrity Level (SIL) concept
and how the GuardLogix controller meets the requirements for SIL 3
certification.
Topic
Page
SIL 3 Certification 13
Functional Verification Tests 14
GuardLogix Architecture for SIL 3 Applications 15
GuardLogix System Components 16
GuardLogix Certifications 18
GuardLogix PFD and PFH Specifications 19
Safety Integrity Level (SIL) Compliance Distribution and Weight 20
System Reaction Time 21
Safety Task Period and Safety Task Watchdog 21
Contact Information If Device Failure Occurs 22
SIL 3 Certification
1756 and 1768 GuardLogix controller systems are type-approved and
certified for use in safety applications up to and including SIL 3
according to IEC 61508 and IEC 62061, safety applications up to and
including Performance Level PLe (Category 4) according to
ISO 13849-1. SIL requirements are based on the standards current at
the time of certification.
IMPORTANT
When the GuardLogix controller is in the Run or Programming
mode and the application has not been validated by the user,
the user is responsible for maintaining safe conditions.
In addition, the standard tasks within 1756 GuardLogix controllers can
be used either for standard applications or SIL 2 safety applications as
described in the Using ControlLogix in SIL 2 Applications Reference
Manual, publication 1756-RM001. In either case, do not use SIL 2 or
standard tasks and variables to build up safety loops of a higher level.
The safety task is the only task certified for SIL 3 applications.
The standard task in 1768 Compact GuardLogix controllers may not be
used for SIL 2 safety applications.
RSLogix 5000 programming software is required to create programs
for 1756 and 1768 GuardLogix controllers.
13Publication 1756-RM093F-EN-P - January 2010 13