Before the deletion process of the retain data is started, it is explicitly checked that the voltage supply in the switched-mode power supply capacitors is sufficient.
What happens?
If the internal suppy voltage of the control card collapses while the external serial flash POU is being deleted, an undefined state may occur in the flash memory. In such a case, different data is offered for each read operation.
What are the effects?
A "df50: retain error" occurs, the device is not ready for operation.
Which products are affected?
8400 StateLine with a firmware < 21.01.00.00
Short-term measures:
Delete the retain data via the corresponding service code.
