On entry into a user CEL function routine, the arguments are automatically converted into the units specified in the Argument List list in the User Function Editor (labeled Argument List in the definition for the function in the CCL file LIBRARY section).

On exit, the results are automatically converted from the Result Units into the solution units used by the CFX-Solver.

This ability to choose the working units for the routine with automatic conversion may be useful for creating interfaces between the CFX-Solver and third-party data or applications.