using PLC DL_WriteNode function block to write a value to datalayer

I am working on a SFK-4H demo and trying to use the core came with SFK-4H. to communicate with SFK-4H I need to read and write variables between core PLC and SFK. for the same variable I can read the value using DL_ReadNode even there are some other items under the same variable

however for the same variable when I write a value to it the DL_WriteNode deosn't work. I have tried to use string to include all items into the value of DL_WriteNode and it showed function block error. I alse tried to add one item into the NodeName and write a value to it, and it didn't work either. can someone help me on that and show me how to write a value into a json format?

Thanks,

 

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