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Rockwell Automation Publication 1715-RM001A-EN-P - June 2019
Chapter 2
Features of the ControlLogix SIL 2 System
Figure 4 - Controller in RUN Mode
Redundant Power Supply
Recommendations
If you are using Redundant 1756 Power supplies, wire the solid-state fault relay
on each power supply from an appropriate voltage source to an input point in the
ControlLogix system so that the application program can detect faults and react
appropriately.
Safety Configurations
When used with 1715 I/O the ControlLogix SIL 2 system supports the
following safety configurations. These SIL 2 architectures are for fail-safe low and
high demand applications. All SIL 2 architectures can be used for de-energize to
trip applications. With special precautions, CLX/1715 SIL 2 can be used in
energize-to-trip applications.
• SIL 2 low demand applications
• SIL 2 high demand – up to 10 demands per year
• SIL 2 fail-safe applications
• SIL 2 with fault tolerant inputs
• SIL 2 with fault tolerant outputs
• SIL 2 with fault tolerant inputs/outputs
IMPORTANT
There are different versions for redundant and non-redundant firmware. Only
certain ones are certified for use in an SIL 2 system. See the revision release list
from the product certifications link for more information.
