how setting COM_MOD_MAST,?

Hi, I am new with abb plc,, I'm trying conumicate a variator with ac500eco but not understand the FB com.mod.mast,,, I don't know how set the FCT and ADD,, pin,,!! I set 16 to write in the fct as say in the dataseet,, and in the ADD set tha variator parameter addres but there is not comunication,, the variator function code to write is necesary when fct of com.mod.mast is set? the variator i not abb for this reazon can not use the lib to acsxx.,.,!! help me.please.,