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This is not described in the manual, but the internal variables for the load flow data of the tap changer is as follows:

NT = ABS(TAPNO(KNUM(KM)))   ! Internal # of tap changer
IC = PQCONT(NT)             ! Internal # of controlled bus
RMAX(NT)                    ! maximum ratio
RMIN(NT)                    ! minimum ratio
NTAPOS(NT)                  ! number of positions
VMAX(NT)                    ! maximum voltage
VMIN(NT)                    ! minimum voltage
WINDRP(NT)                  ! winding 1 ratio

The model shall use IT = 2 (metering model) and update the ratio in MODE=3.

Update variable WINDRP to the new ratio when a tap changer operation is done by the model.

The matrices must be factorised with CALL FACTDS whenever the ratio is changed by the model.