Learn about connector generated quality events
- Last UpdatedDec 24, 2024
- 1 minute read
The connector generates quality events in each value stream to mark exceptional conditions. The connector-generated quality events are recorded in the archives of historians in the same manner as measurement values from the data source. Connector-generated events occur under the following conditions:
-
Start and stop data collection (optional).
-
Addition or deletion of a measurement (optional).
PI Connectors use the OPC quality codes in section 6.8 of the OPC Data Access Custom Interface Specification (version 3.0). Additionally, PI Connector for MQTT Sparkplug uses the following quality codes for connector generated quality events:
|
Code |
Description |
Cause |
|---|---|---|
|
32 (decimal) 00 1000 00 (binary) |
Waiting for initial data |
Initial quality event for all data collection starts. Initial quality event when a PI point is added or selected. |
|
8 (decimal) 00 0010 00 (binary) |
Not connected |
Stopped quality event for all streams when data collection stops. Quality event when a PI point is deselected. |
SYSTEM digital states
In order to know when there is an event, the connector writes the appropriate SYSTEM digital state to the tags. SYSTEM digital states are, for example, Shutdown or IO Timeout.