Rockwell Automation Publication 1769-UM022C-EN-P - June 2018 67
Communicate Over Networks Chapter 5
Manual SNN
If the manual format is selected, the SNN represents entered values from
1…9999 decimal.
Figure 8 - Manual-based SNN Format
Assigning the Safety Network Number (SNN)
You can allow the Logix Designer application to automatically assign an SNN,
or you can assign the SNN manually.
Automatic Assignment
When a new controller or module is created, a time-based SNN is
automatically assigned via the configuration software. Subsequent new safety-
module additions to the same CIP Safety network are assigned the same SNN
defined within the lowest address on that CIP Safety network.
Manual Assignment
The manual option is intended for routable CIP Safety systems where the
number of network subnets and interconnecting networks is small, and where
users might like to manage and assign the SNN in a logical manner pertaining
to their specific application.
See Changing the Safety Network Number (SNN)
on page 68.
IMPORTANT If you assign an SNN manually, make sure that system expansion does not
result in duplication of SNN and node address combinations.
A warning appears if your project contains duplicate SNN and node address
combinations. You can still verify the project but Rockwell Automation
recommends that you resolve the duplicate combinations.
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