Specifications

1 Publication 1794-RM001F-EN-P - September 2011
Preface
Introduction
This application manual is intended to describe the FLEX I/O with ControlLogix
Control System components available from Rockwell Automation that are
suitable for use in SIL2 applications. Use this manual in conjunction with
publication 1756-RM001
Alternate architecture can be used in SIL2 applications if they are approved by
a certifying agency.
Manual Set-Up
This manual is designed to make clear how the FLEX I/O with ControlLogix
Control System can be SIL2-certified. Table Preface.1 lists the information
available in each section.
Understanding Terminology
The following table defines acronyms used in this manual.
Table Preface.1
Section: Title: Description:
Chapter 1 SIL Policy Introduction to the SIL policy and how that
policy relates to FLEX I/O with a ControlLogix
system.
Chapter 2 ControlLogix Communications Description of the ControlLogix communications
modules used in the SIL2-certified FLEX I/O
with ControlLogix system.
Chapter 3 FLEX I/O Modules Description of the FLEX I/O modules used in the
SIL2-certified FLEX I/O with ControlLogix
system.
Chapter 4 General Requirements for
Application Software
Application software requirements for using
ControlLogix and FLEX modules.
Chapter 5 Technical SIL2 Requirements
for the Application Program
Guidelines for application development in
RSLogix 5000 as they relate to SIL2.
Appendix A Failure Estimates Failure rates based on field returns.
Table Preface.2 List of Acronyms Used Throughout the Safety Application Manual
Acronym: Full Term: Definition:
CIP Control and
Information
Protocol
A messaging protocol used by Logix5000™
systems. It is a native communications protocol
used on ControlNet™ communications networks,
among others.
DC Diagnostic
Coverage
The ratio of the detected failure rate to the total
failure rate.
EN European Norm. The official European Standard
GSV Get System Value A ladder logic output instruction that retrieves
specified controller status information and places
it in a destination tag.
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