Rockwell Automation 1763 MicroLogix 1100 Programmable Controllers User Manual - Manual (Page 199)

Publication 1763-UM001D-EN-P - March 2011
Using Control Flash to Upgrade Your Operating System 197
3. During the download, the Run, Force, and Fault LEDs perform a
walking bit pattern. The screen as shown below is displayed on the LCD
as well.
4. When the download is complete, the integrity of the new OS is checked.
If the new OS is corrupt, the controller sends an error message to the
download tool and flashes the Missing or Corrupt OS LED pattern. See
Missing/Corrupt OS LED Pattern below.
5. Following a successful transfer, the Run, Force, and Fault LEDs flash on
and remain on for five seconds. Then the controller resets.
Missing/Corrupt OS LED
Pattern When an operating system download is not successful or if the controller does
not contain a valid operating system, the controller flashes the Run, Force, and
Fault LEDs on and off.