This redundancy solution allows high availability for smaller applications at much less cost by declaring the PLC a redundant unit and configuring communication parameters or failure criteria. This eliminates the need for specialized redundancy controllers and reduces engineering effort. It is powered by the real-time Ethernet Powerlink communication protocol. An independent high-speed fiber optic redundancy link is used to continually synchronize all important data—the I/O image, for example—between active and inactive controllers. The company's standard X20 controllers can be reconfigured at any time using the Automation Studio software development environment. One controller provides active control, while a second controller runs in the background in standby mode. Whichever controller becomes active always uses the same IP address as its predecessor. The switching time of the system is just two task cycles, so all of this takes place in a matter of a few milliseconds.
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