In addition to the usual data fields that you would expect to find on a ClearSCADA Scanner item, a Totalflow Scanner item also has the following data fields, which are listed in the ClearSCADA Database Schema (Scanner Schema View). The name in bold at the start of each entry is also the OPC tag name.
- ClockOffsetToHostSecs—This field indicates the difference between the ClearSCADA clock and the clock in the Totalflow in seconds.
- CommBadRequests—This field contains the number of requests from the driver that were rejected by the Totalflow. This counter is only incremented if the Totalflow actively rejects the request. This typically happens if the request from the driver to the Totalflow is for an invalid point. To reset this and other values mentioned in this topic, call the ResetCommCounters method on the Totalflow Scanner items.
- CommCountersTime—This field indicates the last time that the ResetCommCounters method was called and the counters were reset.
- CommErrors—This field contains the total number of communications errors. The value is typically incremented when a timeout occurs, but can also be incremented on a bad CRC or other communications failure. To reset this and other values mentioned in this topic, call the ResetCommCounters method on the Totalflow Scanner items.
- CommTotalRequests—This field contains the total number of requests sent from the driver to the Totalflow. To reset this and other values mentioned in this topic, call the ResetCommCounters method on the Totalflow Scanner items.
- EventLogPointer—This field contains the index of the newest event in the Totalflow device’s event log. The field is set to 0 when the Totalflow Scanner items is created. The driver uses the value to determine if any new events have occurred since the last scan. You should not need to manipulate this value directly.
- NewestEventTimes—This is an array of 20 date time values. A value is reserved for each tube in the Totalflow device. The value at index 0 corresponds to tube 1, the value at index 1 corresponds to tube 2, and so on. The values in this tag track the timestamp of the newest event that was retrieved for each tube. The driver uses this value to determine the start time for an event data retrieval request from the Totalflow device. To re-scan events for a given tube, set the NewestEventTime at the appropriate index to a time in the past. You can use the ResetNewestEventTimes method on the Totalflow scanner to do this (see Scanner Methods).
- PromotedScanningEnabled—This property is true when promoted scanning is enabled and false when scanning at the normally configured scan rate. To enable promoted scanning, call the EnablePromotedScanning method on the Scanner item.
- TimeLocal—This is the time that the driver last read from the Totalflow.
Further Information