3.2 Abbreviated terms
| DA | Data Access |
| HA | Historical Access (access to historical data or events) |
| HDA | Historical Data Access |
| UA | Unified Architecture |
OPC Unified Architecture – Part 13: Aggregates
OPC Unified Architecture – Part 13: Aggregates
| DA | Data Access |
| HA | Historical Access (access to historical data or events) |
| HDA | Historical Data Access |
| UA | Unified Architecture |