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OPC HDA
OPC HDA Server
The WinCC OA OPC Historical Data Access (HDA) Server is used for the exchanging of archived process data of the WinCC OA project.

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- MQTT Publisher
  The MQTT publisher provides a northbound data interface for MQTT clients to data point values within the WinCC OA project.
- Node-RED
  Node-RED is a flow-based programming tool that allows the creation of applications in a graphic environment.
- OPC UA Server
  The WinCC OA OPC UA Server provides an OPC UA interface to access WinCC OA data point values, alarms and historical data.
- OPC Server
  The OPC Server enables the communication with OPC clients.
- OPC HDA
  - OPC HDA Server
    The WinCC OA OPC Historical Data Access (HDA) Server is used for the exchanging of archived process data of the WinCC OA project.
    - OPC HDA Server
      The WinCC OA OPC Historical Data Access (HDA) Server is used for the exchanging of archived process data of the WinCC OA project.
    - Requirements & Installation
    - Configuration of the OPC HDA Server
    - OPC HDA server CNS
    - OPC DA / OPC HDA / OPC UA server dist
    - [opchdasrv]
      Settings for the OPC HDA Server
    - OPC HDA Server Details
    - Redundancy
  - OPC HDA Client
    The WinCC OA OPC (OLE for Process Control) HDA client allows to query, display and save historical data from OPC HDA servers.
- OPC Alarms & Events
  OPC Alarms & Events (brief OPC A&E) is in addition to the Data Access another standard in order to implement a central alert management manufacturer spanning. OPC A&E is used to guarantee the coupling with other control systems as well as to display alerts and events in a hierarchical system
- Modbus/TCP Server
  The Modbus/TCP server provides the possibility for Modbus/TCP clients to query data from a WinCC OA system and arrange the data within a Modbus data model.
- SNMP
  SNMP (Simple Network Management Protocol) is a protocol for monitoring network devices (servers, workstations, routers, switches and hubs etc.) and their functions. It allows you to administer your network.
- OLE DB Provider
  OLE DB is a Microsoft specification for accessing data on different computers. It is based on Microsoft's COM technology and is the successor to the older and limited ODBC technology.
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OPC HDA Server

The WinCC OA OPC Historical Data Access (HDA) Server is used for the exchanging of archived process data of the WinCC OA project.

OPC HDA uses a client server architecture where WinCC OA only provides an OPC HDA server! Custom clients can be used but the available restrictions of the WinCC OA OPC HDA server must be considered.

Restrictions

Following restrictions must be considered when using the WinCC OA OPC HDA Server:

Only the data of the current project (-currentProj) can be used for the OPC HDA server.
The OPC HDA server must be restarted if changes are applied to the data point group "OPCHDARead".
The OPC communication is not encrypted if a remote OPC HDA client is used. Even if the WinCC OA Proxy is used no encryption is available for the OPC HDA communication.
Only following WinCC OA data point types are supported: bool, int, uint, float, bit32 and time.
Only the "Item Data Type" OPC attributed is supported
No aggregations can be used for the OPC HDA Server