Once an OpenTP1 file system is created, the user can create DAM files with the damload command; the access right to the OpenTP1 file system must be set to user. The name of a physical file must be the same as that in the DAM service definition. When the damload command is executed, a physical file is allocated, and initial data is output to the physical file. In the online mode, access to the DAM file is performed on the corresponding logical file, not the physical file. The relationship between logical and physical files is specified in the DAM service definition. The physical file access right is not passed on to the logical file.

For details of DAM service definition, see the manual OpenTP1 System Definition.

A DAM file can also be created from a UAP; for details, see the manual OpenTP1 Programming Guide.