User manual

6 Publication 1756-RM093F-EN-P - January 2010
Table of Contents
Safety Considerations for CIP Safety I/O Modules. . . . . . . . . 31
Ownership . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Safety I/O Configuration Signature . . . . . . . . . . . . . . . . . 31
I/O Module Replacement . . . . . . . . . . . . . . . . . . . . . . . . 32
Chapter 4
CIP Safety and the Safety Network
Number
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
The Routable CIP Safety Control System. . . . . . . . . . . . . . . . 35
Unique Node Reference . . . . . . . . . . . . . . . . . . . . . . . . . 36
Safety Network Number . . . . . . . . . . . . . . . . . . . . . . . . . 36
Considerations for Assigning the Safety Network
Number (SNN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Safety Network Number (SNN) for Safety Consumed
Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Safety Network Number (SNN) for Out-of-box Modules. . 38
Safety Network Number (SNN) for Safety Module with a
Different Configuration Owner . . . . . . . . . . . . . . . . . . . . 38
Safety Network Number (SNN) when Copying a Safety
Project. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Chapter 5
Characteristics of Safety Tags, the
Safety Task, and Safety Programs
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Differentiate Between Standard and Safety . . . . . . . . . . . . . . 41
SIL 2 Safety Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
SIL 2 Safety Control in the Safety Task . . . . . . . . . . . . . . 42
SIL 2 Safety Control in Standard Tasks
(1756 GuardLogix Controllers Only) . . . . . . . . . . . . . . . . 45
EN50156 Compliance With 1756 ControlLogix
SIL 2 Safety Inputs in Dual-channel Configurations
with 1756 GuardLogix Controllers. . . . . . . . . . . . . . . . . . 45
SIL3 Safety – the Safety Task . . . . . . . . . . . . . . . . . . . . . . . . 47
Safety Task Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . 48
Safety Task Execution Details . . . . . . . . . . . . . . . . . . . . . 48
Safety Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Safety Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Safety Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Standard Tags in Safety Routines (Tag Mapping) . . . . . . . 51
Additional Resources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Chapter 6
Safety Application Development
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Safety Concept Assumptions . . . . . . . . . . . . . . . . . . . . . . . . 53
Basics of Application Development and Testing . . . . . . . . . . 53
Commissioning Life Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Specification of the Control Function . . . . . . . . . . . . . . . 55