Set the Units

The exported data units are set from the working units in the seed file in use. The standard seed file supplied with AVEVA ExPLANT-I has mm as the working units but meters, feet and inches can also be recognized if a different seed file is used.

In a DGN file the working units are described in terms of:

• Master units, these can be named.

• Sub-units, these can be named.

• Resolution units (these are not named).

• Number of sub-units per master unit.

• Number of resolution units per sub-unit.

Firstly, AVEVA ExPLANT-I checks the master units name for millimeters (MM or mm), meters (M or m), feet (FT, ft or ‘) or inches (IN, in or ") for a positive match and if it finds one will set the scaling accordingly.

If there is no positive match, it then checks the sub-unit name against the same unit names and if it finds a match sets the scaling from the sub-unit and the number of sub-units per master unit.

If the units in the seed file are not recognized, the default is to assume MM.