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What are the different use of SD card in Modicon TM221 PLC series.

The Modicon M221 Logic Controller allows the following types of file management with an SD card: 

1. Clone management: back up or restore a complete controller (using an empty SD card) 
2. Firmware management: put and get firmware on a controller 
3. User application management: put and get the user application on a controller 
4. Post configuration management put, change, or remove post configuration information on a controller 
5. Error log management: get or delete an error log file from a controller 

Please take note that SD Card function as optional memory, whenever you download any application into the PLC it goes to PLC memory not in SD Card.
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