Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 127
Chapter 7
Online Editing
Overview of Online Editing Online editing of ladder programs is available when using MicroLogix 1400
processors. Use this function to make changes to a pre-existing ladder
program. Online editing functions consist of inserting, replacing, and deleting
rungs in an existing ladder program while online with the processor.
Only one programming device can perform an online edit of a user program at
a time. When an online editing session begins, an access from other
programming devices are rejected by MicroLogix 1400.
The following table summarizes the differences between offline and online
editing.
Topic Page
Overview of Online Editing 127
Effects of Online Editing On Your System 128
Directions and Cautions for MicroLogix 1400 Online Editing
User
129
Types of Online Editing 130
WARNING: Before initiating an online editing session, we recommend that you fully
understand the possible results of the edit to the system under control. Failure to
properly edit a running program could result in unexpected controller operation.
Physical injury or equipment damage may result.
While three instructions, MSG, PTO, and PWM, are supported by program mode
online edit, they are not supported by RUNTIME (RUN mode) online edit. See
MicroLogix 1400 Instruction Set Reference Manual, publication 1766-RM001
for
additional details.
Offline Online
No restrictions exist. Full
editing capabilities are allowed.
Data table file resizing is not permitted.
Program file creation and deletion are not permitted.
Alteration of file protection is not permitted.
Alteration of static and constant data file values is not permitted.
Indexing across file boundary selections is not permitted.
Force protection selection is not permitted.
I/O configuration is not permitted.
IMPORTANT It is important to keep in mind that some ladder instructions, when
programmed online, cause data table values to change. These instructions
are those that require timer, counter, and control addresses to be
specified. This is discussed later in the chapter.
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