Rockwell Automation FactoryTalk Historian SE 3.0 H2H Interface User Guide - Manual (Page 128)

Interface Diagnostics Configuration
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The ICU uses a naming convention such that the tag containing “(Scan Class 1)” (for
example, “
sy.perf.etamp390.E1(Scan Class 1).point_count” refers to Scan Class
1, “(Scan Class 2)” refers to Scan Class 2, and so on. The tag containing “(_Total)” refers to
the sum of all Scan Classes.
“Scheduled Scans: % Missed” (.sched_scans_%missed)
A .sched_scans_%missed Performance Counters Point is available for each Scan Class of this
Interface as well as a Total for the interface instance.
The .sched_scans_%missed Performance Counters Point indicates the percentage of scans the
interface missed per Scan Class or the total number missed for all scan classes since startup.
A missed scan occurs if the interface performs the scan one second later than scheduled.
The ICU uses a naming convention such that the tag containing “(Scan Class 1)” (for
example, “
sy.perf.etamp390.E1(Scan Class 1).sched_scans_%missed” refers
to Scan Class 1, “(Scan Class 2)” refers to Scan Class 2, and so on. The tag containing
“(_Total)” refers to the sum of all Scan Classes.
“Scheduled Scans: % Skipped” (.sched_scans_%skipped)
A .sched_scans_%skipped Performance Counters Point is available for each Scan Class of
this Interface as well as a Total for the interface instance.
The .sched_scans_%skipped Performance Counters Point indicates the percentage of scans
the interface skipped per Scan Class or the total number skipped for all scan classes since
startup. A skipped scan is a scan that occurs at least one scan period after its scheduled time.
This point is similar to the [UI_SCSKIPPED] Health Point.
The ICU uses a naming convention such that the tag containing “(Scan Class 1)” (for
example, “
sy.perf.etamp390.E1(Scan Class 1).sched_scans_%skipped” refers
to Scan Class 1, “(Scan Class 2)” refers to Scan Class 2, and so on. The tag containing
“(_Total)” refers to the sum of all Scan Classes.
“Scheduled Scans: Scan count this interval” (.sched_scans_this_interval)
A .sched_scans_this_interval Performance Counters Point is available for each Scan Class of
this Interface as well as a Total for the interface instance.
The .sched_scans_this_interval Performance Counters Point indicates the number of scans
that the interface performed per performance summary interval for the scan class or the total
number of scans performed for all scan classes during the summary interval.
This point is
similar to the [UI_SCSCANCOUNT] Health Point.
The ICU uses a naming convention such that the tag containing “(Scan Class 1)” (for
example, “
sy.perf.etamp390.E1(Scan Class 1).sched_scans_this_interval”
refers to Scan Class 1, “(Scan Class 2)” refers to Scan Class 2, and so on. The tag containing
“(_Total)” refers to the sum of all Scan Classes.
Performance Counters for (_Total) only
“Device Actual Connections” (.Device_Actual_Connections)
The .Device_Actual_Connections Performance Counters Point stores the actual number of
foreign devices currently connected and working properly out of the expected number of