dio_longest_area_name

	status.i4.v = dio_longest_area_name(name_length.i4.r)

	This routine returns the length of the longest device
	area names.

	name_length	 length of longest device area name

	This function returns ACNET status values as follows:

	OK			success
	SQL_xxx			error retrieving longest area name length

	This function requires the following include files:

	diolib_h, acnet_errors_h

	Related functions:

	dio_device_area_c, dio_longest_machine_name, dio_device_machine_c,
	dio_longest_department_name, dio_department_info_c 

	C/C++ usage:

	int	status;
	int	name_length;

	status = dio_longest_area_name(&name_length);