Publication 1752-UM001A-EN-P - October 2006
12 Preface
Common Techniques Used
in This Manual
The following conventions are used throughout this manual:
• Bulleted lists, such as this one, provide information, not
procedural steps.
• Numbered lists provide sequential steps or hierarchical
information.
• Italic type is used for emphasis.
Understanding Terminology
The following table defines terms used in this manual.
Terms and Definitions
Abbreviation Full Term Definition
1oo2 One out of two Refers to the behavioral design of a multi-processor safety system.
CIP Common industrial protocol A communications protocol designed for industrial automation applications.
PC Personal computer Computer used to interface with a control system via programming software.
PFD Probability of failure on demand The average probability of an operational system to fail to perform its design
function on demand.
PFH Probability of failure per hour The probability of an operational system to have a dangerous failure occur per
hour.
RPI Requested packet interval When communicating over a network, this is the expected rate in time for
production of data.
SNN Safety network number A unique number that identifies a safety network or safety subnet across all
routable networks in the safety system.
— Standard Any object, task, tag, program, or component in your project that is not a
safety-related item.
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