The statuses and values of IO_IN_[1-4] are copied to the F_IN_Dn attributes and IO_OUT_[1-4] to the F_OUT_Dn attributes, respectively. The worst case status of F_IN_Dn and F_OUT_Dn is set in OUT_D when the IGNORE_PV attribute is False (0). For the case when IGNORE_PV is True (1), the status of OUT_D is set to the worse case status of the F_OUT_Dn attributes.