WEG CFW-11 Communications Manual page 44

It is necessary to observe that the CFW-11 communication objects (1000h to 1FFFh) are not stored in the
nonvolatile memory. Therefore, every time the equipment is reset or switched off, it is necessary to redo the
communication objects parameter setting. The manufacturer specific objects (starting from 2000h that represents
the parameters), they are stored in the nonvolatile memory and, thus, could be set just once.