128 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Chapter 7 Online Editing
Online Editing Terms
The following terms are used throughout this chapter.
• Assemble Edits – Deletes any rungs marked with Delete or Replace edit
zone markers during an online editing session. Inserted or modified
rungs remain. All edit zone markers are removed when this function is
complete.
• Cancel Edits – Deletes any inserted or modified rungs added during an
online editing session. Rungs marked with Delete and Replace edit zone
markers remain. All edit zone markers are removed when this function is
complete.
• Test Edits – Allows you to verify that the changes you entered are not
going to cause improper machine operation before you make the
changes a permanent part of your ladder program.
• Untest Edits – Allows you to disable testing.
• Edit Zone markers – Appear on the power rail of the ladder program
display. They indicate the type of edit taking place on the rung.
• Accept Rung – Incorporates the edits of a single rung into the ladder
program.
• Online edit session – begins when a user tries to edit rungs while online.
Any other programming device that was monitoring the user program is
removed from the program monitor display.
• Modify rung – when an existing rung is modified two edit zones are
created. The original rung is indicated by replace zone markers on the
power rail. A copy of the original rung is made so you can insert, delete,
or modify instructions. This rung is indicated by insert zone markers on
the power rail. Thus, an IR pair is created when you modify a rung.
• Runtime online editing – the user program is executing when an edit
takes place. Any rungs that are inserted, modified, or deleted remain in
the ladder program and are indicated by edit zone markers on the power
rail. Edit zone markers remain after an action is completed.
• Program online editing – the user program is not executing when an edit
session begins. Any action that inserts, deletes, or modifies a rung takes
place immediately.
Effects of Online Editing On
Your System
The following section covers the effects of online editing on your system. Keep
these items in mind while using the online editing function.
System Impacts
The scan time and interrupt latency can be extended when accepting a rung,
assembling, or canceling edits.
Memory limitations – Online edit can be performed until there is insufficient
program memory available in the processor. Note that, before assemble edits,
all the edited rungs are in the processor memory consuming memory,
although they are not executed.
Data Table File Size
Online editing cannot change the size of existing data tables nor can new ones
be created. However, some ladder instructions, when programmed cause data
table values to change. These instructions are those that require timer,
counter, and control addresses to be specified.
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