This product allows an existing Web Supervisor Software Maintenance Agreement to extended / upgraded. An active SMA will be required to allow a Niagra 4 > Niagara 5 upgrade in the future.
All missed time from the previous SMA Expiry date must be covered by the new SMA license. For example the SMA expired four years ago then a new five year SMA must be purchased, four years of missed SMA will be used leaving one year of active SMA.
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