asix keeps a long-term log of events and alarms marked with a resolution of 1 ms. It is possible to save a current value of two custom process parameters (e.g. excess value and limit value ) in the alarm message text. The set of logged events can be dynamically modified through the exclusion of alarms and/or the change of the alarm filtering parameters on the basis of the time factor (hysteresis of a double kind). A wide choice of options for selective viewing of log contents and adjusting the layout to user preferences are available. The search criteria include  among others: technological group, time range, text, alarm confirmation status.

asix system supports several alarm recognition strategies:

• Bitmap strategy – periodical reading of bitmap from the controller, where each bit of the bitmap represents the status of a specific technological alarm recognized by the controller.
• Limit strategy – executed directly by the asix system, which compares the current values of declared process variables with set high/low limits  and generates an alarm, if the limit is exceeded.
• Active strategy – based on messages received from the controller, which contain only the active alarms; alarms are identified through the alarm ID, optionally  with a timestamp. 

In case of network operation of the workstations, the alarm system offers:

• automatic negotiation of alarms configuration,
• synchronization of alarms on all operator workstations connected to the network,
• automatic filling up the alarms log during the workstation restart,
• ability to browse alarms from many servers.

Version 6 of the asix Package introduces the possibility of logging alarm events in an SQL database (such logging is done in parallel with saving alarm events in the binary files archive). The SQL database stores both alarm definitions and alarm events - this data is used by AsAlarm applications and AsRaport reporting environment.

Presentation and analysis of alarms is carried out by programs: AsTrend (presentation of information about the moments of alarm state changes), AsRaport (generating complex reports based on Microsoft SQL Server 2008 Reporting Services) and, above all, AsAlarm - the possibility of advanced analysis of statistical information about alarms and other data relating to alarm system operation(by guidelines EEMUA No. 191).

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