Manual Snn Format And Assignment - Allen-Bradley GuardLogix 5580 Original Instructions Manual

Chapter 4 CIP Safety and Safety Network Numbers
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Manual SNN Format and Assignment

When the manual format is selected, the SNN represents a network type and
must have a decimal value from 1...9999.
Figure 12 - SNN Formats
Manual manipulation of an SNN is required in the following situations:
• To make sure that each safety controller port on the same subnet has the
same SNN in all projects.
• When copying safety projects.
ATTENTION: If a safety project is copied into another project with
different hardware or in another physical location, and the new
project is within the same routable Safety system, every SNN must be
changed in the second system. SNN values cannot be repeated.
See the following user manuals for information on how to change
the SNN:
• ControlLogix 5580 and GuardLogix 5580 Controllers User Manual,
• CompactLogix 5380 Controllers User Manual, publication
IMPORTANT If you assign an SNN manually, make sure that system expansion does not
result in a duplication of SNN and unique node reference combinations.
A warning appears if your project contains duplicate SNN and unique node
reference combinations. You can still verify the project, but we recommend
that you resolve the duplicate combinations.
However, there can be safety devices on the routable safety network that
have the same SNN and node address and are not in the project. In this case,
these safety devices are unknown to the Studio 5000 Logix Designer
application, and you may not see a warning.
If there are duplicate unique node references, as the system user, you are
responsible for proving that an unsafe condition cannot result.
Rockwell Automation Publication 1756-RM012B-EN-P - April 2018
publication 1756-UM543
5069-UM001