PNI800 is the plant network interface of ABB’s Symphony® Plus system. Mounted on an MB805 base, it connects HMI servers and S+ Engineering workstations to the redundant PN800 control network as a realtime data server (Harmony API over Ethernet TCP). If it fails, the controllers keep running but the control room loses visibility. It is not a fieldbus card — PROFIBUS devices use the PDP800.
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