Driver in a redundant System
In a redundant system, a driver usuallay 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 Redundancy, basics.
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
.