Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 107)

Rockwell Automation Publication 1791DS-UM001J-EN-P - May 2013 107
Configure Modules in RSNetWorx for DeviceNet Software Chapter 6
Set Your Password
You can set a password so that the configuration of the 1791DS module cannot
be changed without first entering the password. Use of this password is not
required to obtain SIL 3 integrity, because the configuration signature is part of
the safety connection. If the configuration signature changes, the safety
connection is lost.
If you forget your password, you must contact Rockwell Automation to have it
reset.