Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 126)

126 Rockwell Automation Publication 1791DS-UM001J-EN-P - May 2013
Chapter 7 Considerations When Replacing Guard I/O Modules
I/O Replacement with ‘Configure Always’ Enabled
When the ‘Configure Always’ feature is enabled, the controller automatically
checks for and connects to a replacement module that meets all of the following
requirements:
• The controller has configuration data for a compatible module at that
network address.
• The module is in out-of-box condition or has an SNN that matches the
configuration.
Although chances are small, this allows the possibility of the wrong controller
taking ownership of the replacement module.
For modules with different SNNs, clicking Reset Ownership places the module
in an out-of-box condition. Once in out-of-box mode, no action is needed for the
GuardLogix controller to take ownership of the module.
ATTENTION: Enable the ‘Configure Always’ feature only if the entire CIP
Safety Control System is not being relied on to maintain SIL 3 behavior
during the replacement and functional testing of a module.