60 Rockwell Automation Publication 1756-UM022D-EN-P - May 2017
Chapter 4 Communicate over Networks
Automatic Versus Manual
For typical users, the automatic assignment of an SNN is sufficient. However,
manual manipulation of the SNN is required if the following is true:
• Safety consumed tags are used.
• The project consumes safety input data from a module whose
configuration is owned by some other device.
• A safety project is copied to another hardware installation within the
same routable CIP safety system.
Change the Safety Network Number (SNN)
Before changing the SNN you must do the following:
• Unlock the project, if it is safety-locked.
See
Safety-lock the Controller on page 118.
• Delete the safety task signature, if one exists.
See
Delete the Safety Task Signature on page 122.
Change the Safety Network Number (SNN) of the Controller
1. In the Controller Organizer, right-click the controller and choose
Properties.
2. On the General tab of the Controller Properties dialog box, click to
the right of the safety network number to open the Safety Network
Number dialog box.
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