130 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Chapter 7 Online Editing
Types of Online Editing The type of online editing is dependent on the MicroLogix 1400 processor’s
mode switch position in LCD display and the processor’s mode. There are two
types of online editing:
• Program Online Editing — when the processor is in either PROG mode
or REM Program mode
• Runtime Online Editing — when the processor is in either REM Test or
REM Run mode
The following table summarizes the MicroLogix 1400 processor mode switch
positions in LCD and modes that enable online editing.
Edit Functions in Runtime Online Editing
During a runtime online editing session, the processor is executing ladder
logic. The edit zone markers tell the processor that changes exist, but the
changes are not executed until you test the edits.
Deleted and replaced (modified) rungs are not removed from the program and
inserted rungs are not executed until you assemble or test the edits.
Edit Functions in Program Online Editing
During a program online editing session, the processor is not executing ladder
logic. This mode is like the offline editing mode. Note that if a runtime online
ATTENTION: If you use EII or STI interrupts and your application requires a quick
interrupt latency, the online edit feature is not recommended. Online editing
feature may increase the interrupt latency response time. To ensure minimum
interrupt latency, place the mode switch in LCD screen in the RUN mode. This
prevents the use of the online editing feature.
mode switch Position
MicroLogix 1400
Processor Mode
Editing Mode
RUN RUN Not Available
PROGram Program Program Online Editing
REMote REMote Program Program Online Editing
REMote REMote Test Runtime Online Editing
REMote REMote Run Runtime Online Editing
IMPORTANT Online editing is not available when the mode switch in LCD screen is in the
RUN position.
ATTENTION: Use the online editing function while in the RUN mode to make minor
changes to the ladder program. We recommend developing your program offline
since ladder rung logic changes take effect immediately after testing your edits.
Improper machine operation may occur, causing personnel injury or equipment
damage.
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