62 Rockwell Automation Publication 1756-RM093J-EN-P - April 2018
Chapter 6 Safety Application Development
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 all affected
elements of the application, as determined by the impact analysis, before
resuming operation.
The flowchart on page
63 illustrates the process for offline editing.
Performing Online Edits
If online edits affect the safety program, you must revalidate all affected elements
of the application, as determined by the impact analysis, before resuming
operation. The flowchart on page
63 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 55 and Lock the GuardLogix
Controller on page 58 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
.
Modification Impact Test
Any modification, enhancement, or adaptation of validated software must be
planned and analyzed for any impact to the functional safety system. All
appropriate phases of the software safety lifecycle need to be carried out as
indicated by the impact analysis. At a minimum, functional testing of all
impacted software must be carried out. All modifications to software
specifications must be documented. Test results must also be documented. Refer
to IEC 61508-3, Section 7.8 Software Modification, for detailed information.
Limit online edits to minor program modifications such as setpoint changes
or minor logic additions, deletions, and modifications.
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