status.i4.v = alarm_cancel_message_c(device_index.i4.v,

	This routine allows a process to cancel an alarm message which
	was created by an earlier call to alarm_send_message_c.

	device_index	device index to submit alarm for
	alarm_type	type of alarm
			(DIO_ANALOG -> analog alarm,
			 DIO_DIGITAL -> digital alarm)

	This function returns status values as follows:

	OK			success
	CLIB_INVARG		invalid parameter passed for alarm type
	DIO_NOATT		requested alarm property does not exist
	DIO_INVDEV		requested device is not a software alarm device
	DIO_xxx			error retrieving alarm node
	ACNET_xxx		ACNET communication error

	This function requires the following include files:

	clib_h, acnet_errors_h

	Related functions:

	alarm_send_message_c, alarm_report, alarm_rptw_text, alarm_submit_event

	C/C++ usage:

	int	status;
	int	device_index = 223330;		// G:ACLALM
	int	alarm_type = DIO_ANALOG;

	status = alarm_cancel_message_c(device_index,alarm_type);