Rockwell Automation 1764-xxxx MICROLOGIX 1500 PROGRAMMABLE CONTROLLERS - Manual (Page 132)

Publication 1764-UM001B-EN-P - April 2002
D-2 Upgrading Your Operating System
Performing the Upgrade The following steps occur during the upgrade process.
1. Controller mode and communications parameters are checked.
2. Download begins.
3. During the download, the Force, Battery, and Comms LEDs
perform a walking bit pattern.
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 computer and flashes the Missing or Corrupt OS
LED pattern. See Missing/Corrupt OS LED Pattern below.
5. Following a successful transfer, the Power, Force, and Battery
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.