Rockwell Automation 1768-L45S Compact GuardLogix Controllers - Manual (Page 37)

Rockwell Automation Publication 1768-UM002C-EN-P - April 2012 37
Configure the Controller Chapter 3
Handling I/O Module
Replacement The Safety tab of the Controller Properties dialog box lets you define how the
controller handles the replacement of an I/O module in the system. This option
determines whether the controller sets the safety network number (SNN) of an
I/O module to which it has a connection and for which it has configuration data
when a safety task signature
(1)
exists.
Figure 4 - I/O Module Replacement Options
Enable Time Synchronization In a Compact GuardLogix controller system, Time Synchronization must be
enabled for the controller. To allow the controller to become the CST master,
enable Time Synchronization on the Date/Time tab of the Controller Properties
dialog box. Time Synchronization provides a standard mechanism to synchronize
clocks across a network of distributed devices.
(1) The safety task signature is a number used to uniquely identify each project’s logic, data, and configuration, thereby protecting the
system’s safety integrity level (SIL). See Safety Task Signature on page 12 and Generate a Safety Task Signature on page 90 for more
information.
ATTENTION: Enable the Configure Always feature only if the entire
routable CIP Safety Control System is not being relied on to maintain
SIL 3 during the replacement and functional testing of a module.
See Chapter 5, Add, Configure, Monitor, and Replace CIP Safety I/O for more
information.