Rockwell Automation Publication 1756-RM093J-EN-P - April 2018 31
CIP Safety I/O for the GuardLogix Control System Chapter 3
To set the proper SNN when a safety signature exists, a manual action (typically
SET), is required to download the proper SNN, after which the remainder of the
configuration is automatically downloaded.
Configure Always
The GuardLogix controller will always attempt to automatically configure a
replacement CIP Safety I/O module if the module is in an out-of-box condition,
meaning that a safety network number does not exist in the replacement safety
module, and the node number and I/O module keying matches the controller’s
configuration.
ATTENTION: Enable the Configure Always feature only if the entire routable CIP
Safety control system is not being relied on to maintain SIL 3 behavior during
the replacement and functional testing of a module.
If other parts of the CIP Safety control system are being relied upon to maintain SIL
3, make sure that the controller’s Configure Always feature is disabled.
It is your responsibility to implement a process to make sure proper safety
functionality is maintained during device replacement.
ATTENTION: Do not place any modules in the out-of-box condition on any CIP
Safety network when the Configure Always feature is enabled, except while
following the module replacement procedure in the GuardLogix Controllers User
Manual, publication 1756-UM020
, or the 1768 Compact GuardLogix Controllers
User Manual, publication 1768-UM002
.
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