Q03UDVCPU power data retention

[redgated]

I have a Q03UDVCPU and an unusual application whereby the PLC is frequently powered down and the data needs to be backed up without a battery.

I have already configured the SD card to carry the program and the initial data, but I have some program derived data that I would like to record at power down and restore on power up, previously this was straighforward with battery back-up but seems not so easy without.

Any ideas please?

[Gambit]

Make a File register file for the SD card  and use the File register created in the Device setting.

[redgated]

I thought that would be an option but how do I create the file register on the SD card?

File register settings not available in Device at the moment.

 

[Gambit]

You first need to create a fileregister file in the File Tab under PLC parameters !!!!! 3rd Tab plc parameters. top left 

[redgated]

Yes here I thought but I can't access the SD card!

[Gambit]

Just checked you are right it is only possible om the Flash Card of the standard series. 

Maybe you can use.
SP.FREAD (batch-reads data from the specified file in the memory card.)
SP.FWRITE (batch-writes data to the specified file in the memory card.)

OR

Data back-up function (back-up standard RAM and use with Auto restore.)