CX80xx - MicroSD cards
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MicroSD card as ignition source in potentially explosive atmospheres Gases or dusts can be ignited by a spark discharge when the MicroSD card is inserted or removed. Switch off the power supply and wait until the 1-second UPS has discharged. Ensure that there is no explosive atmosphere before you insert or remove the MicroSD card.  | 
In the basic version the CX80xx contains a MicroSD card with 512 MB. You can order it as an option with larger cards (up to 8 GB).
The cards employed are SLC memory with extended temperature range for industrial applications. Use exclusively MicroSD cards approved by Beckhoff.
Example of a MicroSD card:

Order identifier  | Capacity  | Description  | 
|---|---|---|
CX1900-0123  | 1 GB  | MicroSD card (SLC memory) with extended temperature range for industrial applications instead of the 512 MB card (ordering option)  | 
CX1900-0125  | 2 GB  | |
CX1900-0127  | 4 GB  | |
CX1900-0129  | 8 GB  | |
Order identifier  | Capacity  | Description  | 
CX1900-0122  | 512 MB  | MicroSD card (SLC memory) with extended temperature range for industrial applications as spare part.  | 
CX1900-0124  | 1 GB  | |
CX1900-0126  | 2 GB  | |
CX1900-0128  | 4 GB  | |
CX1900-0130  | 8 GB  | 
Further Information: https://www.beckhoff.com/CX8000
