Vladimir Bogoev

Hello,
Please, excuse me. I found something about 840Di but think that can be helpful.
It's from "Manual 840Di" page 122

1. If the MCI board is detected defective during the power-up of the

SINUMERIK 840Di, the last SRAM image is kept when shutting down

Windows XP. After the MCI board has been changed, proceed as described

above.

2. If the MCI board is changed due to a supposed or an actual error (in the

case of suspected errors, sporadic errors, etc.), we recommend starting up

the SINUMERIK 840Di-NC and PLC; otherwise, data errors could be taken

over from the SRAM image.