Allen-Bradley 1756-L6 Series, Reference Manual, Page: 85 / 134

Rockwell Automation Publication 1756-RM001I-EN-P - May 2012 85
Requirements for Application Development Chapter 7
Changing Your
Application Program The following rules apply to changing your application program in
RSLogix 5000 software:
• Program edits are not recommended and should be limited. For example,
minor changes such as changing a timer preset or analog setpoint are
allowed.
• Only authorized, specially-trained personnel can make program edits.
These personnel should use all supervisory methods available, for example,
using the controller keyswitch and software password protections.
• Anyone making data or programming edits to an operational system
assumes the central safety responsibility while the changes are in progress.
These personnel must also maintain safe application operation.
• Prior to making any program edits, you must perform an impact analysis
by following the safety specification and other lifecycle steps described in
Figure 47 on page 84 as if the edits were an entirely new program.
• Users must sufficiently document all program edits, including:
– authorization.
– impact analysis.
– execution.
– test information.
– revision information.
• Multiple users cannot edit a program from multiple programming
terminals simultaneously.
• Changes to the safety application software, in this case--RSLogix 5000,
must comply with IEC 61511 standard on process safety section 11.7.1
Operator Interface requirements.
• When the ControlLogix controller keyswitch is in the RUN position
(controller is in Run mode), you cannot make online edits.
• You can edit the relay ladder logic portion of the safety program using one
of the following methods described in
Table 3 .
IMPORTANT
You cannot make program edits while the program is online if the
changes prevent the system from executing the safety function or if
alternative protection methods are not in place.
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