User manual

Publication 1756-RM093F-EN-P - January 2010 25
GuardLogix Controller System Chapter 2
No extra configuration or wiring is required for SIL 3 operation of the
ControlLogix power supplies. Any failure would be detected as a
failure by one or more of the active components of the GuardLogix
system. Therefore, the power supply is not relevant to the safety
discussion.
1768 Compact GuardLogix
Controller Hardware
The 1768 Compact GuardLogix controllers combine the primary and
safety partner controllers in a single controller hardware package to
form a SIL-3 capable controller. Compact GuardLogix controllers
feature a 1768 backplane and a 1769 backplane to support standard
1769 I/O modules.
The 1768 Compact GuardLogix controller is powered by a 1768-PA3
or 1768-PB3 power supply. A 1769-ECR end cap is also required.
CIP Safety Protocol
Safety-related communication between GuardLogix controllers takes
place via produced and consumed safety tags. These safety tags use
the CIP Safety protocol, which is designed to preserve data integrity
during communication.
For more information on safety tags, see Chapter
5, Characteristics of
Safety Tags, the Safety Task, and Safety Programs.
Safety I/O
For information on CIP Safety I/O modules for use with GuardLogix
controllers, see Chapter
3.
Controller Maximum 1768 Modules (local) Maximum 1769 I/O Modules
(local and remote)
1768-L43S 2 16
1768-L45S 4 30