The simple method, to me, is to use output(s) for alarms. You can either use different outputs that drive different alarm horns OR you can setup a single output to make different signals i.e. 3 short burts, or 3 long bursts, or ??? It is also possibe to use an analog output to make WAWA sounds or any type of oscillating sound.
Usually SCADA or HMI just provide information telling what an alarm is for, the actual action is developed in the PLC.
Usually there is a section allocated for Alarms but I have no idea about Ifix, someone may be able to assist with that.
BTW: I have developed some fairly simple programs that the alarm section took an equal if not greater amount of memory.