Chivo, I have written detail troubleshooting for the AL40-33 for Conventional CMHD I/o; but you have the profibus I/O instead.
Can you post a picture of the Alarm? I do know that bad BIOS can cause the fault on the RTCPU 3-424-2169A0x boards.
Did you load the Default BIOS from the BIOS Menu 1st, and then change items on the paper printouts?
Also what leds are on on the top of the Profibus-DP Card at time of Failure?
GWood