The strategy you are looking for is possible in CFC and it is really helpful.To couple the outputs of FC to inputs of FBs, use the input parameters of FB strored in the instant DB.For that , assign "RSnew_DB.y" to "R"output parameter of FC140. I think this is efficient and you use all available resources and using extra local memory saved.

Please try it in TIA Portal and update it here.It is applicable in STEP 7.

I hope this helps,
Hamid Hosseini