Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 129
Chapter 7 Online Editing
Online Edit Error
If either electrical interference, communication loss, or a power cycle occur
during online edit session, program integrity may be impacted. In this case,
the controller will generate the 1F fault code, clear the user program, and load
the default program.
Directions and Cautions for
MicroLogix 1400 Online
Editing User
A Download is Required Before Starting Online Editing
At least one download is required before you can start online editing.
If you are using a MicroLogix 1400 from out-of-box state or after clearing
processor memory or a firmware upgrade, at least one download is required
before starting online edits. If not, an error occurs and programming software
will go offline due to a default image mismatch between RSLogix 500
programming software and the MicroLogix 1400 controller. You can also see
the fault code 1Fh which is a user defined fault code.
In order to prevent this error, you need to download the program to the
MicroLogix 1400, although the program is empty.
This problem happens only in out-of-box state or after clear processor
memory.
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.
ATTENTION: PTO and PWM instructions may not be deleted during runtime online
edit. This is because if the PTO or PWM instructions were deleted during runtime
online edit, outputs could stop in an unpredictable state, causing unexpected
equipment operation.
If you attempt to insert or modify a rung with MSG, PTO, and PWM instruction, the
following error message are generated by programming software Error: Online
editing of PTO, PWM, and MSG are not allowed on ML1400 RUN mode. And, the rung
with MSG, PTO, and PWM instruction will not be accepted.
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.
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