Specifications

Hardware Description of LCN Node Processors – HMPU Processor and Associated Boards
12/01 Application ModuleX Service 31
Honeywell
LLCN board
functionality
The LLCN board provides the LCN interface functionality used by the
HMPU node processor. The actual connection to the LCN cables is
through the CLCN A/B I/O (or LCN I/O) board which is inserted in the
I/O card chassis immediately behind the LLCN board (same board slot).
The LCN node address is pinned on the CLCN A/B I/O (or LCN I/O)
board and is covered later in this section.
LLCN board
indicators
The LLCN board indicators are visible from the free edge of the board
when it is installed in a chassis. They provide visual indications
regarding the existing conditions on the board. An illustration is provided
below.
The LLCN indicators are illustrated below.
40024
LLCN
TXBus
Trans Error
Pass
Mod Test
Self
Test/Error