Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 105)

Rockwell Automation Publication 1791DS-UM001J-EN-P - May 2013 105
Configure Modules in RSNetWorx for DeviceNet Software Chapter 6
Set the Safety Network Number (SNN)
If you attempt to set the safety network number (SNN) when a safety connection
is active and the SmartGuard controller is in Run mode, you see this message.
When you attempt to change the SNN, this dialog box appears.
Follow these steps to change the SNN.
1. To change the SNN based on time, click Time-based and then click
Generate.
2. To change the SNN based on a value of your own, click Manual and enter
your value in the box.
3. Once you have your new SNN established, click OK.
Current SNN