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Business Logic / Control
Endless possibilities in data processing for your projects.
NextGen Archiver Backend-API
This chapter describes the NextGen Archiver Backend API
Backend API architecture
This chapter describes what classes you must implement to implement your backend.
Handlers
CommonBackend class contains read-write handlers to process a read-write event.

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Business Logic / Control
Endless possibilities in data processing for your projects.
- Introduction to CTRL
  An introduction to the product's own programming language Control(CTRL).
- Control Classes
  The overview of classes available in Control.
- Types of Control Functions
  An overview of the types of functions distinguished within Control.
- Control graphics
- CONTROL Functions
- CtrlExtension
  The CtrlExtension allows the addition of custom C++ code.
- CTRL Debugger
  You can use the CTRL debugger to debug the Control programming language. The debugger can be used via its own panel, which also enables the monitoring and setting of variable values during the execution of a script.
- SQL in CONTROL
  The database functions enable you to quickly carry out value queries on data points and elements.
- API Manager
  The WinCC OA API (Application Programming Interface) offers a number of functions adding special Managers to this process control system.
- NextGen Archiver Backend-API
  This chapter describes the NextGen Archiver Backend API
  - Architecture
    This chapter provides an overview of the NGA system architecture.
  - Backend
    Description of what is a backend.
  - Segment Management
    The segments are used for NGA archiving. In order to keep the data manageable, NGA structures the data of each archive group into segments.
  - Requirements
    Contains the requirements for the NGA Backend API.
  - Project structure
    This chapter describes the project structure of the TemplateNextGenArchBackend project (lib, exe and plugin projects as well as the dplist directory).
  - Build steps
    Build steps contains the steps Create new project and Updating third-party libraries in an existing project.
  - Work modes
    The backend can work in various modes.
  - Backend API architecture
    This chapter describes what classes you must implement to implement your backend.
    - CommonBackend
      The class CommonBackend contains handlers and general logic for interacting with the frontend.
    - ConfigChannelHandler
      This chapter describes the class ConfigChannelHandler that contains public methods such as synchronous and asynchronous requests.
    - Database parameters
      This chapter describes what function to execute in order to establish a connection with the database.
    - WinCC OA project system information
      This chapter describes which function to use to obtain system information
    - Metadata
      The metadata consists of archive groups and DPEs (data point elements) that are defined in the WinCC OA project.
    - Handlers
      CommonBackend class contains read-write handlers to process a read-write event.
      - Write handler
        Setup the onWriteRequest handler of the CommonBackend class to handle write events.
      - Read handler
        Setup the onReadRequest handler of the CommonBackend class to handle read events.
      - Direct read
        This chapter describes how to process read requests in direct read mode.
      - Read from REMOTE system
        You can query the remote system from the local system. This chapter describes the two read modes you can use for a query: Non-direct read mode and direct read mode.
      - WinCC OA Queries
        This chapter describes the query functions supported by a backend.
      - Processing the query
        To send a response to a query, a message of type ReadResponse is used.
      - DataReceivedHandler handler
        The DataReceivedHandler handles configuration-related logical operations.
      - DatabaseActivityMonitor handlers
        The DatabaseActivityMonitor class is used to notify WinCC OA about the state of the connection between the backend and the database.
  - Redundancy
    Describes the NGA redundancy.
  - Backend lifetime
    This chapter describes the backend lifetime consisting of the different steps for starting and stopping such as Create a CommonBackend instance and Get DatabaseParameters.
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User Management
All about authorization, authentication and login-customization.
Availability
How to get your system uptime to the maximum.
Reporting
Create state of the art project reports without limits.
Addons
Useful tools and enhancements for special demands.
Reference Tables
Detailed and extensive content for special project adaptation.
Videos & Tutorials
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WinCC OA Documentation
Basic information about terms and functions within the documentation.
Disclaimer
A brief clarification of liability exclusions or legal notices.

Handlers

CommonBackend class contains read-write handlers to process a read-write event.