status.i4.v = dio_cancel_alarm(device_index.i4.r, alarm_type.i4.r,
				       ftd.i2.r [,start_block.i4.r]

	status.i4.v = dio_cancel_alarm_c(device_index.i4.v, alarm_type.i4.v,
					 ftd.i2.v [,start_block.i4.v]

	This routine cancels an alarm block previously accessed via
	a call to 'dio_get_alarm'.

	device_index	device index
	alarm_type	type of alarm
			(DIO_ANALOG -> analog alarm,
			 DIO_DIGITAL -> digital alarm)
	ftd		frequency time descriptor
			(FTD_ONESHOT -> one shot (default),
			 FTD_DEFAULT -> use database default FTD,
			 FTD_1HZ -> 1 Hz request,
			 FTD_EVENT_MASK OR'ed with TCLK event value -> read
			 on TCLK event (event constants are in tclk_events)
			 (can use the macro BUILD_EVENT_FTD(event) or
			  BUILD_EVENT_PLUS_DELAY_FTD(event,delay) in 'macro'))
	[start_block]	starting block to return (starts at 0)
			(default is 0) (maximum is DIO_MAX_ALARM_BLOCKS - 1)
	[num_blocks]	number of blocks returned (default is 1)
			(maximum is DIO_MAX_ALARM_BLOCKS)

	This function returns ACNET status values as follows:

	OK			success
	DIO_CANFAIL		alarm block not found

	This function requires the following include files:

	diolib_h, acnet_errors_h, tclk_events_h, macro_h

	Related functions:


	C/C++ usage:

	short	ftd = FTD_ONESHOT;
	int	status;
	int	device_index = 14430;
	int	alarm_type = DIO_ANALOG;
	int	start_block = 0;
	int	num_blocks = 1;

	status = dio_cancel_alarm_c(device_index,alarm_type,ftd,