Home
Southbound Interfaces
The process connection to the actual machines/sensors.
Driver Specific Functions
Common Connection State
State.ConnState
The common connection state (Common.State.ConnState) provides a unified connection status for all WinCC OA drivers.
commonConnState
The commonConnState is a general enumeration that represents the connection states for all WinCC OA drivers.

Version Information
Release Notes, Update information, Certifications and Frequently Asked Questions.
Concepts
Your first step into modern and powerful process visualization.
Deployment
Topics you need to know before using WinCC OA.
Security
Go beyond the norm in cybersecurity.
Engineering
Powerful tools for easy or complex engineering tasks.
Data Management
Classify, structure and archive your data.
Business Logic / Control
Endless possibilities in data processing for your projects.
Data Visualization
User interfaces, Trends and Reports for every purpose and device.
Southbound Interfaces
The process connection to the actual machines/sensors.
- Driver Specific Functions
  - Poll groups
  - Poll on use
  - Bidirectional peripheral communication
  - Connection deactivation and invalid bit settings
  - Driver Certificate
  - Driver Diagnostics
  - Common Connection State
    - isConnectedState()
      The function checks if the Common state is Connected by using the value of the element Common.State.ConnState..
    - getOverallConnState()
      The function checks if a connection is working by using the connection name.
    - State.ConnState
      The common connection state (Common.State.ConnState) provides a unified connection status for all WinCC OA drivers.
      - commonConnState
        The commonConnState is a general enumeration that represents the connection states for all WinCC OA drivers.
      - Common Connection State Mapping - BACnet
      - Common Connection State Mapping - DNP3
      - Common Connection State Mapping - EIP
      - Common Connection State Mapping - IEC60870
      - Common Connection State Mapping - IEC61850
      - Common Connection State Mapping - Modbus
      - Common Connection State Mapping - MQTT
      - Common Connection State Mapping - OPC
      - Common Connection State Mapping - OPC UA
      - Common Connection State Mapping - S7
      - Common Connection State Mapping - S7Plus
  - Driver in a redundant System
  - Driver Internal Datapoints
- S7Plus Driver
  The WinCC OA S7Plus driver uses the Siemens communication library IOMS and is meant for the communication with Siemens S7 PLCs.
- S7 Driver
  The WinCC OA S7 driver is a native driver for connection to the periphery with Siemens S7 PLCs.
- OPC Unified Architecture (OPC UA)
  OPC Unified Architecture (in short OPC UA) is the most recent OPC specification from the OPC Foundation and differs significantly from its predecessors (DA, A&E, HDA). OPC UA forms a new standard, which is completely based on a service-oriented architecture.
- OPC Client
  This chapter explains the most important terms and presents the steps involved in starting a functioning OPC communication. The individual points will be dealt with in more detail in the subsequent chapters.
- 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
- IEC 60870-5 Driver
  IEC drivers are standardized remote control drivers that can contain proprietary telegrams.
- IEC 61850 Driver
  IEC 61850 defines an architecture for meeting the needs of electrical substation automation.
- Modbus/TCP Driver
  Modbus/TCP is an adaptation of the serial Modbus protocol for TCP/IP communication. The Modbus/TCP driver can be used for Modbus/TCP or UNICOS at the same time.
- 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.
- BACnet Driver
  BACnet (Building Automation and Control Networks) is a normed protocol for building automation and was designed by ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) in order to provide a consistent and intraoperative standard for data communication in and with systems of building automation.
- DNP3 Driver
  The WinCC OA DNP3(Distributed Network Protocol 3) driver uses an open, robust and modern protocol, which has similar characteristics and strong points like the IEC Driver. The transmission of any number of telegrams with different data types occurs between the WinCC OA system (master) and the outstation (slave).
- Ethernet/IP Driver
  Ethernet/IP is used to communicate with multiple generations and families of Rockwell Automation / Allen Bradley PLCs. It is an application layer protocol, layered on top of standard TCP/IP networking.
- MQTT
  MQTT (Message Queuing Telemetry Transport) is a messaging protocol which works on top of the TCP/IP protocol and is meant for communication in networks with limited bandwidth.
- S-Bus Driver
  The WinCC OA S-Bus driver is used for the connection from SAIA PCD control devices to WinCC OA projects.
- SSI Driver
  The WinCC OA SSI driver is used for interfacing SAT remote systems.
- SINAUT Driver
  SINAUT (SIemens Network AUTomation) is a communication protocol for automatic monitoring and controlling of remote process stations on basis of SIMATIC S7 developed by Siemens.
- RK512 Driver
  The WinCC OA driver RK512 is used for interfacing a programmable logic controller using the 3964R/RK512 protocol.
- SECS
  The SECS (SEMI Equipment Communications Standard/Generic Equipment Model) is a communications standard published by Semiconductor Equipment and Materials International (SEMI).
- OCPP
  The Open Charge Point Protocol (OCPP) 1.6 is a standardized communication protocol designed to facilitate interoperability between Electric Vehicle (EV) charging stations and Central Management Systems (CMS).
- Simulator Driver
  The WinCC OA simulator assumes the tasks of a driver without being connected to actual peripherals. This means it simulates the periphery and is able to generate values "spontaneously". It does this by passing data to the Event Manager that this manager would receive from system components during normal operation of a system. The control system functions can be tested after configuration.
- NTCIP Gateway
  NTCIP (National Transportation Communications for ITS Protocol) is a family of open standards for the configuration, control and monitoring of traffic control equipment (e.g. traffic lights, dynamic message signs, vehicle counting).
- TLS Gateway
  The WinCC OA TLS gateway (Technical Delivery Terms for Route Stations) is a standard for using and establishing traffic control systems on roads.
Northbound Interfaces
Your portal to the cloud or supervising systems.
Web Connectivity / Network Interfaces
Data exchange, APIs and web technologies
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
Explore the capabilities of WinCC OA with our carefully selected collection of video tutorials and guides.
eLearning
Build Your Expertise Step by Step
Documentation
Basic information about terms and functions within the documentation.
Support & Services
An experienced team of support agents, consultants and trainers are ready to facilitate active partnerships with our customers, so they can profit from our comprehensive service.
Disclaimer
A brief clarification of liability exclusions or legal notices.
SIMATIC WinCC OA World
Explore the World of WinCC OA and Stay updated with the latest product news

commonConnState

The commonConnState is a general enumeration that represents the connection states for all WinCC OA drivers.

Enumeration


Enum Constant	Value	Description
Undefined	-1	No matching common connection state could be found
UndefinedByDriver	0	e.g. if connection state was never written
NotConnected	1	e.g. driver has been stopped when connection has been set to active
Connecting	2	Driver tries to acquire connection
NotActive	3	Connection has been deactivated by the user
Disconnecting	4	Driver tries to disconnect from the device
Failure	5	Common connection failure
WaitForReconnect	9	Driver is waiting before trying to reconnect
Connected = 256	256	Driver is connected
ConnectedFirstDevFirstCon	257	Redundant hardware: driver is connected and uses the first connection of first device for active communication
ConnectedFirstDevReduCon	258	Redundant hardware: driver is connected and uses second connection of first device for active communication
ConnectedReduDevFirstCon	259	Redundant hardware: driver is connected and uses first connection of second device for active communication
ConnectedReduDevReduCon	260	Redundant hardware: driver is connected and uses second connection of second device for active communication
GeneralQuery	261	Driver performs general query
GetConfigData	262	Driver acquires device configuration data, e.g. through online browsing

Value Ranges Description

State values 0-255 indicate not-connected states
State values 256-511 indicate connected states
State -1 indicates an undefined state, i.e. the actual connection state is unknown. This state is only used internally for error detection and not written to DPE.

Note:

The currently undefined status values are reserved for future use. A driver does not have to use all status values, but if a value is used, it has the defined meaning.