User manual

64 Publication 1756-RM093F-EN-P - January 2010
Chapter 6 Safety Application Development
• If online edits exist only in the standard routines, those edits are
not required to be validated before returning to normal
operation.
• You must ensure that changes to the standard routine, with
respect to timing and tag mapping, are acceptable to your safety
application.
• You can edit the logic portion of your program while offline or
online, as described in the following sections.
Performing Offline Edits
When offline edits are made to only standard program elements, and
the safety task signature matches following a download, you can
resume operation.
When offline edits affect the safety program, you must revalidate the
entire application before resuming operation.
The flowchart on page 65
illustrates the process for offline editing.
Performing Online Edits
If online edits affect the safety program, you must revalidate the entire
application before resuming operation. The flowchart on page 65
illustrates the process for online editing.
Online edits are affected by the safety-lock and safety task signature
features of the GuardLogix controller.
See Generate the Safety Task Signature
on page 57 and Lock the
GuardLogix Controller on page 60 for more information.
For detailed information on how to edit ladder logic in RSLogix 5000
software while online, see the Logix5000 Controllers Quick Start,
publication 1756-QS001
.
TIP
Limit online edits to minor program modifications such as
setpoint changes or logic additions, deletions, and
modifications.