Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 106)

106 Rockwell Automation Publication 1791DS-UM001J-EN-P - May 2013
Chapter 6 Configure Modules in RSNetWorx for DeviceNet Software
The new SNN is sent to the 1791DS module. This dialog box appears
informing you that the 1791DS configuration will be cleared when the
SNN is changed.
Next, this dialog box appears to allow you to confirm which module is
about to have its SNN set.
The network status indicator on the module that is about to have its SNN
set is flashing red/green.
4. Click OK to confirm.
This dialog box appears and the network status indicator should stop
flashing red/green.