is_family.i4.v = dio_is_family(device_index.i4.r)

	This routine determines whether or not device DI is a family device.
	A value of TRUE is returned if it is a family device.

	device_index	device index in question

	This function returns status values as follows:

	TRUE			device is a family device
	FALSE			device is not a family device

	This function requires the following include files:

	cnsparam_h, diolib_h

	Related functions:

	dio_is_family_list_c, dio_family, dio_expand_family_c,

	C/C++ usage:

	int	is_family;
	int	device_index = 9181;

	is_family = dio_is_family(&device_index);