The 51305072-100 is the CE version of the LCN I/O board for Honeywell's 5-slot and 10-slot chassis. This is the card where the LCN node address is set, and where the LCN A and B cables are connected. This version uses a slide switch for addressing.

TPN modules communicate with each other through interconnections of coaxial cable and fiber optic cable. There are two LCN cables for redundancy, Cable A and Cable B. Each cable must be routed separately and must be marked to indicate that it is Cable A or Cable B.

Cable A is marked with yellow and Cable B with green shrink-fit bands at the connectors. Each node on the TPN connects to both LCN Cable A and LCN Cable B through connectors called BNC tees on the front of 51305072-100 pwa. These connectors allow a node to be disconnected from the coaxial cable segment without disrupting communication among the other nodes. The tee connectors are part number 51190728-105 (this is not the same part number used for Data Hiway tee connectors).

An LCN can have up to seven coaxial cable segments_a central segment and up to six remote segments or remote nodes. The remote segments are connected to the central segment with LCN Extenders (LCNE2s/XLCNE2s). LCN Extenders use fiber optic cables that provide ground isolation and can run through hazardous areas to interconnect LCN coaxial cable bus segments.

For the Non-CE version of this interface, see the 51305072-400.