TDC 3000 Input Output Address Board Part No :- 51107404-100 Assy No :- 51107403-100 Series: TDC 3000 LCN XCVR I/O PWA(51305072-400) This is the LCN I/O board for LCN nodes, used in a 5-slot or 10-slot non-CE chassis. This is the board where the LCN node address is set, and where the LCN A and B cables are connected.