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The process connection to the actual machines/sensors.
S7 Driver
The WinCC OA S7 driver is a native driver for connection to the periphery with Siemens S7 PLCs.

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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.
- 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 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.
- 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.
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Data exchange, APIs and web technologies
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Videos & Tutorials
Explore the capabilities of WinCC OA with our carefully selected collection of video tutorials and guides.
WinCC OA Documentation
Basic information about terms and functions within the documentation.
Disclaimer
A brief clarification of liability exclusions or legal notices.

S7 Driver

The WinCC OA S7 driver is a native driver for connection to the periphery with Siemens S7 PLCs.

The driver can communicate with S7-300, S7-400 and S7-1200 devices. The native S7 driver can be used under Windows and Linux for

Sending data to the PLC.
Polling data from the PLC.
Receiving spontaneous data from the PLC. For this purpose you must use the extension TSPP (Time Stamped Push Protocol).
Receiving and acknowledging S7 alarms

The protocol used for this driver is the so called ”S7 messaging” the telegrams are transported via TCP/IP. S7 messaging is the protocol that Siemens applications also use for communication. As opposed to the Fetch/Write protocol, for example, it is possible to encode data for several data blocks in one telegram.

Considering redundancy with WinCC OA and the periphery the following cases can be covered with the S7 driver in WinCC OA:

WinCC OA can be redundant.
Each WinCC OA system can have one or more network cards for the communication with the PLCs.
Each WinCC OA system can have one or two connections to each PLC.
Each WinCC OA system can communicate with two redundant PLCs (either in one redundant PLC or two PLCs).

Client/Server and Master/Slave

In normal operation the S7 driver will be the master in the communication as usual for a SCADA system. This means that the communication requests are sent by the S7 driver.

The S7 driver also supports the Slave mode for the TSPP extension (in this case it is also possible to receive spontaneous data from the PLC). The establishment of the TCP/IP connection for a TSPP connection is also done by the driver.

Layer model

The S7 driver in WinCC OA was implemented with ACCON-AGLink, a toolkit from Deltalogic. The programmed API of ACCON-AGLink and the DLL from this toolkit is the interface between WinCC OA / S7 driver and the periphery / S7 PLCs. The ACCON-AGLink provides the following functions:

Configuration of the connections
Establish / close the connections to the PLCs
Send data to the PLCs
Poll data from the PLCs
Alive check for the used connections

For the communication with a S7 PLC the S7 messaging protocol via TCP/IP is used. The advantages of this protocol are:

Mixed data (data with different data types) can be sent in one telegram
Data in different DBs can be sent in one telegram

The design of the connection to the periphery via ACCON-AGLink consists of the following layers: