Driver in a redundant System

In a redundant system, a driver usually runs on the left and right side of the redundant WinCC OA system.

Since both drivers may have different status information about internal data points, they typically use different internal data points (e.g. "_PLC1" on the left and "_PLC1_2" on the right side). See also Redundancy, basics for more details on the redundant sides.

Note: In such a configuration, each driver is only associated with its local EVENT.

Note: In a redundant system, the "<DP>" and "<DP>_2" datapoints are created for each driver connection. In singular systems only the "<DP>" is created. Therefore, the "<DP>_2" must be created manually when a singular system is upgraded for redundancy!

There can also be configurations where one driver should connect to the entire redundant system (such as a UI manager), meaning that the driver's connection is internally switched to the active system. This can be achieved through the config entry connectToRedundantHosts = 1 which is valid in each driver's section. In this case there is only one driver for both sides and therefore the system always uses the internal data point without _2.