pdcupu DEPRECATED

	primary_value.r4.v = pdcupu(common_value.r4.r, pdb.s.r, error.i2.r 
				    [,units_text.i1a.r])

	This function is used to scale the value of a device expressed
	in common units to a value expressed in primary units.  The
	function always returns a single-precision real value.

	common_value	data value in common units to convert
	pdb		Process Data Block (scaling data)
			(reading and setting properties only)
			(structure of type PDB_RS)
	error		returned status value
			(OK = scaling success
			 DIO_xxx = scaling failure)
	[units_text]	returned units text (LEN_DEV_UNITS characters)
			(default is NULL)

	This function returns status values as follows:

	converted value in primary units

	This function requires the following include files:

	cnsparam_h, cns_data_structs_h, clib_h, acnet_errors_h

	Related functions:

	pdcupu_ext, pdcupu8, pdcuud, pdcuud_ext, pdcuud8, pdpuud, pdpuud8,
	pdpuud_ext, pdpucu, pdpucu_ext, pdpucu8

	C/C++ usage:

	char	units_text[LEN_DEV_UNITS];
	short	error;
	float	primary_value;
	float	common_value;
	PDB_RS	pdb;

	primary_value = pdcupu(&common_value,&pdb,&error,units_text);