OPC Foundation has defined various standard software interfaces of OPC. The OPC server of WinCC supports the following specifications.

(1)OPC DA 1.0A and 2.0

OPC data access (OPC DA) is a specification for managing process data. WinCC OPC DA server loads this specification.

(2)OPC HDA 1. 1

OPC historical data access (OPC HDA) is a specification for managing archived data. This specification is an extension of OPC data access specification, and WinCC OPC HDA server conforms to this rule.

(3)OPC A & amp； E 1.0

OPC alarms and events are specifications for sending process alarms and events.