HistorianThe Collectors Section
- Access the Collector Maintenance page of a collector by selecting the collector name. You can also access the Collector Maintenance page by selecting the collector link at the beginning of the System Statistics section.
- Automatically refresh the data every 45 seconds by selecting the Auto check box.
- Manually refresh the data by selecting Refresh.
The following table describes the fields in the Collectors section.
| Field | Description |
|---|---|
| Collector | Displays the collector ID, which is used to identify the collector in Historian. |
| Status | Displays the current status of collection. This field contains one of the following values:
|
| Computer | Displays the name of the computer on which the collector is running. |
| Report Rate | Displays the number of samples per minute that the server is receiving data from the collector. It is a measure of the collection rate and data compression. If the collector compression percent is zero, and if the value in this field is equal to the data acquisition rate, it indicates that every data point received from the collector is being reported to the server. This means that the collector is not performing any data compression. You can lower the report rate, and make the system more efficient, by increasing the data compression at the collector. To do this, widen the collection compression deadbands for selected tags. |
| Overruns | Displays the overruns in relation to the total events collected since startup. This value is calculated by using the following equation: OVERRUN_PCT = OVERRUNS / ( OVERRUNS + TOTAL_EVENTS_COLLECTED ) Overruns are a count of the total number of data events not collected on their scheduled polling cycle. In normal operation, this value should be zero. You may be able to reduce the number of overruns on the collector by increasing the tag collection intervals (per tag). |
| Compression % | Displays the percentage of how effective compression is at present for the specific collector since collector startup. A value of zero indicates that compression is either turned off or not effective. To increase the value, enable compression on the collector's associated tags and increase the width of the compression deadband on selected tags. The collector keeps track of how many samples it collected from the data source (for example, the OPC server) and keeps track of how many samples it reported to the Historian Data Archiver (after collector compression is complete). A low number or zero means almost everything coming from the data source is being sent to the data archiver. The reason for the low number or zero is that too many samples are exceeding compression or you are not using collector compression. A high number or 100 means you are collecting a lot of samples, but they are not exceeding collector compression and therefore are not being sent to server. |
| Out of Order | Displays the number of samples within a series of timestamped data values normally transmitted in sequence that have been received out of sequence since collector startup. This field applies to all collectors. Even though events are still stored, a steadily increasing number of out-of-order events indicates a problem with data transmission that you must investigate. For instance, a steadily increasing number of out-of-order events when you are using the OPC collector means that there is an out-of-order connection between OPC Server and the OPC collector. This may also cause out-of-order connection between the OPC collector and the data archiver although that is not what this statistic indicates. |
| Redundancy | Displays the current redundancy status of the collector. This field contains one of the following values:
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