22 Rockwell Automation Publication 1734-UM013N-EN-P - September 2017
Chapter 1 POINT Guard I/O Overview
Figure 1 - POINT Guard I/O Modules in EtherNet/IP Safety Architecture
Figure 2 - POINT Guard I/O Modules in DeviceNet Safety Architectures
Safety Application
Requirements
POINT Guard I/O modules are certified for use in safety applications up to and
including Performance Level e (PLe/Cat. 4) and Safety Integrity Level 3
(SIL CL3) in which the de-energized state is the safe state. Safety application
requirements include evaluating probability of failure rates (PFD and PFH),
system reaction time settings, and functional verification tests that fulfill SIL 3
criteria.
Creating, recording, and verifying the safety signature is also a required part of
the safety application development process. The safety controller creates the
safety signatures. The safety signature consists of an identification number, date,
and time that uniquely identifies the safety portion of a project. This number
includes all safety logic, data, and safety I/O configuration.
Safety Communication
GuardLogix
Controller
CompactBlock™
Guard I/O™
POINT Guard I/O and POINT I/O
Standard Communication
Stratix™ Switch
GuardLogix
Controller
CompactBlock Guard I/O
POINT Guard I/O and POINT I/O
Safety Communication
Standard Communication
SmartGuard
Controller
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