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Southbound Interfaces
The process connection to the actual machines/sensors.
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.
Supported OPC UA profiles

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Your first step into modern and powerful process visualization.
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Topics you need to know before using WinCC OA.
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Southbound Interfaces
The process connection to the actual machines/sensors.
- 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.
  - Requirements and Installation
  - OPC UA - Establish Communication
  - OPC UA Client Configuration
  - Configuration of a Subscription
  - Definition of the Peripheral Address of the OPC UA Driver
  - Browsing for Items
  - OPC UA - Server Discovery
  - Security
  - OPC UA Data Exchange & Structures
  - Buffering during connection loss
  - Buffering during client restart
  - OPC UA Status Codes
  - Events
  - OPC UA Alarms and Conditions
  - Historical Access
  - OPC UA GDS Pull
    OPC UA GDS Pull enables centralized discovery and certificate management for OPC UA applications by leveraging a Global Discovery Server (GDS). The GDS automates certificate deployment, trust relationships, and security updates, streamlining configuration and ongoing management for both clients and servers. Integration requires initial certificate setup and acceptance in the GDS, after which applications are managed automatically.
  - [opcua]
    Settings for the OPC UA client
  - Possible Debug Flags for the OPC UA Client
  - Internal data points of the OPC UA client
  - OPC UA Client - Redundancy
  - OPC UA Client - Methods
  - OPC UA Certificates
  - Notes and Restrictions
  - Supported OPC UA profiles
  - Glossary
  - How-Tos
- 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.
- PROFIsafe Driver
  As an application profile of PROFINET, PROFIsafe is responsible for the communication between safety devices (F-Device) and safety controllers (F-Host).
- 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).
- 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.
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.

Supported OPC UA profiles

Following profiles are supported by the OPC UA server/client in WinCC OA version 3.20.

Further details and descriptions for the profiles and facets can be found under: https://profiles.opcfoundation.org/v104/reporting/

OPC UA Server profiles

The OPC UA server supports the "Standard 2017 UA Server Profile" with the following additional Facets:


*Server Category*
	Base Eventing
		Standard Event Subscription Server Facet
		Address Space Notifier Server Facet
	Alarm & Condition
		A&C Address Space Instance Server Facet
		A&C Acknowledgeable Alarm Server Facet
	Historical Access
		Historical Access Read Raw
	Redundancy
		Redundancy Visible Server Facet

OPC UA Client profiles


*Client Category*
	Core Characteristic
		Core 2017 Client Facet
		Base Client Behavior Facet
		AdressSpace Lookup Client Facet
		Discovery Client Facet
	Data Access
		Attribute Read Client Facet
		Attribute Write Client Facet
		DataChange Subscriber Client Facet
	Base Eventing
		Event Subscriber Client Facet
	Alarm & Condition
		Address Space Instance Client Facet
		Exclusive Alarming Client Facet
		Non-Exclusive Alarming Client Facet
	Redundancy
		Redundant Client Facet
		Redundant Switch Client Facet
	Historical Access
		Historical Access Client Facet
	Generic Features
		Method Client Facet

OPC UA Server and Client Profiles


*Transport Category*
	Transport
		UA-TCP UA-SC UA Binary
*Security Category*
	SecurityPolicy
		SecurityPolicy - None
		Security Policy [B] - Basic256Sha256
		SecurityPolicy [A] - Aes128-Sha256-RsaOaep
		SecurityPolicy - Aes256-Sha256-RsaPss
		SecurityPolicy - Basic256 (Deprecated)
		SecurityPolicy - Basic128Rsa15 (Deprecated)