PM866 Redundant fault Led blinking
we have problem with controller AC800M PM866 (backup controlller) fault LED blinking red, what thats mean? we have try change the backup controller, and update the firmware (on backup controller only) but the fault still appear (red blinking). The controller at the first time led dual is "On" but suddenly became "Off". what that mean? is it RCU link cable need to change? or primary controller need to update firmware?
Do you have a BC810?
In case not, you have to replace only the backup CPU module and not the baseplate of it.
Both CPU's has to be loaded with EXACTLY the same firmware. After connecting of the new unit and power-up, you have to press INIT button.
In case BC810 is used, there is an other procedure described.
Look for instructions on page 199 and afterwards of 3BSE036351-510 A
Source: 3BSE036351-510 A