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[Nigmor]

I have a modicn tsx that runs a vacuum former, the battery light was on, changed the battery but now I have ter and err lights flashing and the magelis controller is saying no program writing 

[cHud]

Did you change the battery while the controller was on? or did you switch off the power. If you switched off and then changed the battery then you lost the program.

Does this plc have a memory card installed? And is it a tsx micro or Premium

[Quant]

if you really switched off the PLC to change the battery and the application was not saved on memory card or in flash, then it was big mistake :(