Interface up-time (seconds)
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The number of seconds since the interface has started. This counter is incremented once a second.
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IO Rate (events/second)
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The number of events per second received by the interface. If this counter is viewed from the Windows performance monitor, one should increase the update time of the performance monitor to the minimum scan period for the interface. For example, say that the minimum scanning period for the interface is 5 seconds (/f=5). One can set the update rate of the performance monitor to 5 seconds by selecting the “Chart…” command from the Options menu. In the dialog box, change the periodic update time to 5 seconds. If the update time is left at 1 second, then the IO Rate will appear to go to zero between scans because no events are received between scans.
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Point Count
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Number of points loaded by the interface.
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Scan Time (milliseconds)
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Time in milliseconds to call developer function and to write values to PI. There is one “Scan Time” counter per scan class.
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Scheduled Scans:
% Missed
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Percentage of missed scans since starting the interface. If a scan occurs more than 1 second after its scheduled time, the scan is considered missed. There is one “Missed Scans” counter per scan class.
Related counters:
Scheduled Scans: % Skipped
Scheduled Scans: Scans this interval
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Scheduled Scans,
% Skipped
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Percentage of skipped scans since starting the interface. If a scan occurs 1 scan period or more after its scheduled time, then 1 or more scans are considered skipped. There is one “Skipped Scans” counter per scan class.
Related counters:
Scheduled Scans, % Missed
Scheduled Scans, Scans this interval
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Scheduled Scans: Scans this interval
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The total number of scans in the current performance interval. This total is the current sample size that is used to evaluate the % Missed Scans and the % Skipped scans. The performance interval is 8 hours by default, but this can be changed by the /perf command-line parameter. The minimum performance interval is 60 seconds (see the /perf parameter for more information). When the performance interval is exceeded, the previous samples are discarded and the sampling starts again from scratch.
Related counters:
Scheduled Scans, % Skipped
Scheduled Scans, % Missed
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Log file message count
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Number of messages that have been written to the log file. Only applies to the instance _Total.
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Points edited in the interface
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Number of point edits that have occurred. Only applies to the instance _Total.
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Points added to the interface
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Number of point that have been added to the interface. Only applies to the instance _Total
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Points removed from the interface
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Number of point that have been removed from the interface. Only applies to the instance _Total
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