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Northbound Interfaces
Your portal to the cloud or supervising systems.
MQTT Publisher
The MQTT publisher provides a northbound data interface for MQTT clients to data point values within the WinCC OA project.
Configuration of the MQTT Publisher
State

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Northbound Interfaces
Your portal to the cloud or supervising systems.
- MQTT Publisher
  The MQTT publisher provides a northbound data interface for MQTT clients to data point values within the WinCC OA project.
  - Requirements and Installation
  - Configuration of the MQTT Publisher
    - Connection
      General connection parameters like host and port number. Depending on the configuration a redundant connection can also be configured.
    - Advanced
      Advanced tab that allows to define advanced settings, like Root Topic, Intervals and Client ID.
    - Certificate
      Certificate tab that allows to define a client-side certificate that is be used for the communication with the MQTT broker.
    - Default / Last Will
      Common settings for the MQTT messages as well as Last Will settings.
    - State Details
      Details about the current state of the connection as well as general message statistics.
    - Commands
    - State
  - Data Access for the MQTT Publisher
  - Internal data points of the MQTT Publisher
  - Notes and Restrictions
  - [mqttpub]
    Settings for the MQTT Publisher.
  - How-To
- 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 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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WinCC OA Documentation
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Disclaimer
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State

State Host 1 / State Host 2

Displays the connection state of host 1 / host 2. Following states are possible:

0 - Inactive
1 - Disconnected
2 - Connecting
3 - Connected
4 - Disconnecting
5 - Failure