Rockwell Automation 1766-Lxxxx MicroLogix 1400 Programmable Controllers User Manual - Manual (Page 165)

Rockwell Automation Publication 1766-UM001H-EN-P - May 2014 123
Chapter
7
Online Editing
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 programming software
(RSLogix500) and the MicroLogix 1400. 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.
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 will be 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.