Control of Working Failures

In order to be reliable, an alert management system must be able to treat events in all circumstances. To guarantee a high level of security, it must control that the supervised application works correctly, that the link with this one is available and tha t it will be able to trigger the necessary calls when an alarm will be detected.

To insure the security of the whole system, Alert offers control functions on its environment: Control of the application working and of the link with this one

Alert can detect a failure of the link with the application. This failure is materialized by the fault indicator of the alarm status bar (" LINK"), the "Supervision" led becoming red and by recording the "LINK FAILURE" in the event log. It also set to "1" the value o f the DDEFAIL item of the Alert DDE server. This item can be self -supervised by Alert to produce an alarm. In case of link failure with a DDE or OPC server, the connection can be automatically switched on a secondary DDE or OPC server. Alert also can perf orm periodical DDE or OPC requests ( watchdog) for one or several variable. If there is no answer after the specified delay, a LINK fault is generated, as for a link failure. Besides, the alarm associated to the event is triggered. Control of the working of call systems (modems)

Alert is able to detect a working defect of a modem on a communication port and to generate consecutively a communication port failure. This failure is materialized by the fault indicator of the alarm status bar (" MODEM"), the corr esponding led becoming red and by recording the COM failure in the event log. It also set to "1" the value of the "PORTFAIL" item of the Alert DDE server. This item can be self -supervised by Alert for producing an alarm.