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Take the following picture as an example. The upper Vigor3220 is regarded as primary device,
the lower Vigor3220 is regarded as secondary device. When primary Vigor3220 Series is
broken down, the secondary device could replace the primary role to take over all jobs as
soon as possible. However, once the primary device is working again, the secondary device
would be changed to original role to stand by.
Vigor3220 Series User's Guide
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