Historian Monitor (Reference) provides real-time visibility into historian table operations and data collection status during runtime, it enables:

  • Real-time status of historian tables
  • Trend chart visualization of historical data
  • Performance metrics tracking
  • Error monitoring and diagnostics
  • Remote access via web browser

Access the monitor at Historian → Historian Monitor when connected to runtime.

In this page:


Historian → Tutorial | Concept | How-to Guide | Reference


Monitor Components

Trend Chart Page

Built-in user interface for visualizing historian data:

  • Created using TrendChart Control
  • Same tools available for custom displays
  • Template available in Charts library
  • Real-time and historical data viewing

Status Table

Runtime properties of all historian tables:

  • Row counts and success metrics
  • Error tracking and messages
  • Last stored timestamps
  • Performance indicators

Remote Access

Monitor historian status remotely without installation:

URL Format:

http://[server]:3101/html5/?Monitor=Historian

Parameters:

  • [server]: IP address or hostname
  • Port 3101: Production profile (default)
  • Port 3201: Development profile

Example:

http://192.168.1.100:3101/html5/?Monitor=Historian

Monitor Table Properties

ColumnDescriptionRuntime Access
NamespaceItem namespace location-
NameHistorian table identifier@Historian.Table.<Name>
RowCountTotal rows stored@Historian.Table.<Name>.RowCount
SuccessCountSuccessful storage operations@Historian.Table.<Name>.SuccessCount
ErrorCountFailed storage attempts@Historian.Table.<Name>.ErrorCount
LastStoredTimeStampMost recent data timestamp@Historian.Table.<Name>.LastStoredTimeStamp
LastStoredErrorMessageLatest error description@Historian.Table.<Name>.LastStoredErrorMessage

Runtime Property Access

Access monitor properties in displays or scripts:

csharp

// Get table status
int rows = @Historian.Table.ProcessData.RowCount;
int errors = @Historian.Table.ProcessData.ErrorCount;
DateTime lastStore = @Historian.Table.ProcessData.LastStoredTimeStamp;

// Check for errors
if (@Historian.Table.ProcessData.ErrorCount > 0)
{
    string error = @Historian.Table.ProcessData.LastStoredErrorMessage;
    // Handle error condition
}

Using Monitor Data

Health Monitoring

csharp

// Calculate success rate
double successRate = @Historian.Table.MyTable.SuccessCount / 
                    (@Historian.Table.MyTable.SuccessCount + 
                     @Historian.Table.MyTable.ErrorCount) * 100;

Data Validation

csharp

// Check data currency
TimeSpan dataAge = DateTime.Now - @Historian.Table.MyTable.LastStoredTimeStamp;
if (dataAge.TotalMinutes > 5)
{
    // Alert: Data may be stale
}

Troubleshooting with Monitor

Common Issues

High Error Count:

  • Check storage location connectivity
  • Verify database permissions
  • Review error messages for patterns
  • Check disk space

No Row Count Increase:

  • Verify triggers are firing
  • Check tag quality
  • Review deadband settings
  • Confirm table is enabled

Timestamp Not Updating:

  • Check data collection is running
  • Verify tag values are changing
  • Review SaveOnChange settings
  • Check time deadband

Best Practices

  • Monitor regularly - Check error counts daily
  • Set up alerts - Notify on error thresholds
  • Track trends - Monitor row count growth
  • Document errors - Keep log of issues
  • Use remote access - Monitor from anywhere
  • Create dashboards - Build custom monitoring displays
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