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VFD modbus interrupt problem found. Than reset the VFD.
Optical fibber connection, CCTV PoE Switch Onu Inter connection, 5 NOS camera add in Nav-4,
1.UTP Cable Change 2.Connector Change 3.IP Setup
Dtw 101,102,103,109,110 RTU panel , VFD internal site & CCTV panel cleaning complete .