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The PLB file shall be located in the same path as the DYR file. First, your DYR file must contain the following definition of the playback model:
BusNr 'USRMDL' machID 'PLBVFU1' 1 1 3 4 3 6 1 1 'PLBFNAME' Ubase Fbase 0.000 0.000 /
Note that at that bus no other dynamic model shall be attached.