B&R is setting new standards with its redundancy solution for X20 control systems, a breakthrough that now allows the advantages of high availability to be enjoyed by smaller applications at much lower cost.

B&R’s solution is based on standard X20 controllers that can be reconfigured at any time with features reducing down-time using the Automation Studio software development environment. This eliminates the need for specialised redundancy controllers, which are generally very expensive.

In B&R’s solution, one controller provides active control, while a second controller runs in the background in standby mode. All network functions are monitored continuously so that if the time comes, the back-up controller can quickly take over all of the active PLC’s functions. Whichever controller becomes active it always uses the same IP address as its predecessor. The switching time of the system is a mere two task cycles – so all of this takes place in a matter of a few milliseconds.

This redundancy solution is powered by the high performance, real time Ethernet POWERLINK communication protocol. An independent high speed fibre optic redundancy link is used to continually synchronise all important data – the I/O image, for example – between the active and inactive controllers.

B&R Industrial Automation


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