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Southbound Interfaces
The process connection to the actual machines/sensors.
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.
Redundant SNMP agent

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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 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.
  - Requirements and installation
  - SNMP Driver Configuration
  - Defining the peripheral addresses of the SNMP driver
  - Start the SNMP communication
  - Example for the SNMP driver
  - Redundant SNMP agent
  - Internal data points
    This chapter describes the internal data points _SNMPManager, _SNMPAgent, _SNMPLive agent and "_SNMPV3Entity".
  - Data types and debug levels
  - MIB
  - Traps / Informs
    This chapter describes how the WinCC OA SNMP components handle SNMP traps and informs messages and what functionality can be achieved.
  - Notes and Restrictions
- 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
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All about authorization, authentication and login-customization.
Availability
How to get your system uptime to the maximum.
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Reference Tables
Detailed and extensive content for special project adaptation.
Videos & Tutorials
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Basic information about terms and functions within the documentation.
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Disclaimer
A brief clarification of liability exclusions or legal notices.

Redundant SNMP agent

The SNMP driver can establish connection to a redundant SNMP agent in case the first agent is not available anymore. The driver communicates only with one agent at the same time. To configure a redundant SNMP agent refer to Configuration of the SNMP driver. The second agent (if correctly configured) is only alive checked. The driver only switches to the second agent if the first agent is not available anymore.

There is no preferred agent, which means that the driver does not switch back to the first agent. The driver communicates with second agent as long as it is available. If it is not available anymore, the driver switches back to the first agent.

In case of an agent switch, the driver sends the last unsuccessful request to the second agent. If the second agent is also unavailable the request is discarded.

After startup, the driver will always try to communicate with the first target.

Redundancy switch

Depending on the SNMP agent configuration the driver can switch to the redundant agent in the following cases:

redu switch on timeout: defines if an agent switch shall be performed if the response of a read or write request returns the TIMEOUT status
redu switch on keepAlive-error: defines if an agent switch should be performed if a keepAlive check fails
redu switch on timeout and/or keepAlive-error: defines if an agent switch shall be performed if a keepAlive check fails or a read/write request returns the TIMEOUT status

SNMP in redundant WinCC OA System

From Version 3.20, the redundant SNMP driver can use communication with both redundant agents.

The relevant "<DP>_2" datapoints are automatically created for the internal datapoints of the second system.

Note:

The _SNMPAgent and _SNMPV3Entity datapoints have been separated to facilitate this behavior.

Note:

As a fallback option the redundancy behaviour can be reset to the legacy behaviour by setting the config entry [snmpdrv] useReduPostfix to "false" if absolutely required. This should however only be done in strictly necessary cases, as the fwdDpType config.redu entries related to the datapoints must be removed manually to reach the exact behaviour.