Rockwell Automation 1756-L7x GuardLogix 5570 Controllers - Manual (Page 41)

Rockwell Automation Publication 1756-UM022A-EN-P - November 2012 41
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 8 - I/O Module Replacement Options
Enable Time Synchronization In a GuardLogix controller system, one device in the local chassis must be
designated as the coordinated system time (CST) master. 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 96 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.