152 Rockwell Automation Publication 1766-UM001I-EN-P - June 2015
Chapter 7 Online Editing
In online edit during PROGRAM mode (program online edit), there are no
restrictions. For example, a user can insert MSG instruction if related MG file or
MG/RI file is already defined in data file.
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.
ATTENTION: When editing a rung that contains an MCR
instruction, both the MCR start and MCR end rungs must be edited
(whether it be test/assemble/cancel) at the same time. 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.
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
Online editing is not available when the mode switch in LCD screen
is in the RUN position.
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