The Alarm Log is a historical record of all alarms. In contrast, the Alarm Summary shows only Current Alarms and Unacknowledged Alarms. Each time an Alarm occurs, a line is entered in the Alarm Log describing the alarm. Three lines are printed for a Text Type tag in Alarm. Acknowledgement by the operator is also recorded. This is similar to Alarm Printers in control rooms, except alarms are written to a text file.
Figure 7.4Alarm Log
The Alarm Log Display can be viewed from the Toolbar icon or Ctrl+F8 function key or a pushbutton with the <GOTO>ALARMLOG keymacro. The Right-Click Menu can also call up the Action Log (Right Click -> Goto -> Alarm Log).
Only Power Users and the admin account can view the Alarm Log through a Web Browser. (General Users and Restricted users cannot view the Alarm Log through a Web Browser). All users can view the Alarm Log locally on the SCADA node using ViewDAQ.
Optionally, you can also Alarm Log to Printer. As each alarm occurs, a line is printed on the printer for each Analog and Discrete Alarm. Text-type tags do not alarm. Acknowledgement by the operator or user is also recorded. See Alarm Log To Printer for more information.
The last 10,000 alarms are shown on the Alarm Log Display. The last 5000 are written to the Text file on the hard drive of the SCADA node. When the 5001 alarm occurs, the oldest alarm entry is overwritten in the text file. Similarly, when the 10,001th alarm occurs, the oldest alarm in the Alarm Log Display is over-written. Restarting the SCADA node or a Client empties the Alarm Log, which is then refreshed with the last 5000 alarms logged to the Hard Drive.
If you need more than the last 10,000 alarms recorded to hard drive, optionally, you can record the Alarm Log to an ODBC Database. As part of software installation, WebAccess creates an Access Database on the Project Node. All Alarms can be recorded to the Database from all SCADA nodes in your system to provide a centralized Alarm Log. See Alarm Log To ODBC Database for more information.
The Alarm Log is a pre-built template display supplied with Web Access. It can be customized by engineers and technicians using DRAW. How your Alarm Log appears (colors, Fonts, etc.) and behaves may vary based on how (or if) the Almlog.Bxx (and Almlog.dxx) on your system is modified.