We have 802d sl 6FC5370-0AA00-2AA0 PCU T / M plus PCU. We are facing data loss problem after power on / off. We need to start up with "Power up with saved data" everytime. 

Pls guide me. I have taken 802D data backup.  Is there any battery in PCU?

In control panel there SLM & DMM only.

You post in the german speaking part of the forum.

Tomorrow the moderator would move your topic to the english speaking part of the forum.

Closed cause question posted twice.

The second thread with the subject Sinumerik 802d sl: Whenever we power off and power on, all the data is lost is published within the conference SINUMERIK CNC automation systems.