1. BS EN 62541-100:2015. OPC unified architecture - Part 100: Device Interface

2. BS EN 62541-11:2015. OPC unified architecture - Part 11: Historical Access

3. BS EN 62541-13:2015. OPC unified architecture - Part 13: Aggregates

4. BS EN 62541-3:2015. OPC unified architecture - Part 3: Address Space Model

5. BS EN 62541-4:2015. OPC unified architecture - Part 4: Services

6. BS EN 62541-5:2015. OPC unified architecture - Part 5: Information Model

7. BS EN 62541-6:2015. OPC unified architecture - Part 6: Mappings

8. BS EN 62541-7:2015. OPC unified architecture - Part 7: Profiles

9. BS EN 62541-8:2015. OPC unified architecture - Part 8: Data Access

10. BS EN 62541-9:2015. OPC unified architecture - Part 9: Alarms and conditions