
12/01 Application ModuleX Service 17
Honeywell
3. Hardware Description of LCN Node Processors
3.1 K2LCN-X Node Processor
Overview
The K2LCN processor board contains all of the essential parts to make
up the kernel portion of any LCN node. It includes a 68020 processor,
LCN interface circuits, and 6 or 8 megawords of on-board memory (for
AXM). It does not have floating point calculation hardware capability.
The exact memory size is determined by which option is purchased. A
minimum of 6 megawords is required to support R500 software.
Changing memory size requires the replacement of the current K2LCN
board with a board containing the proper memory complement. This
board cannot be upgraded in the field.
The K2LCN board memory size is easily recognized by the -X portion of
the name on the left extraction lever; i.e., K2LCN-6 = 6 megawords or
K2LCN-8=8megawords.
K2LCN indicators
The K2LCN board indicators are visible from thefree edge of the board
while the board is installed in a module chassis. The indicators provide a
visual indication regarding the present condition of the board.
Two illustrations of the indicators follow. The first illustration shows the
indicator layout on an early production K2LCN board, assembly
51401551-x00. The second illustration shows the indicators on the latest
production K2LCN board, assembly 51402615-x00.
The indicators provide identical information on both boards.
The indicators on the early production K2LCN board, assembly
51401551-x00, are shown in the following illustration.
Self-Test
Error
Self-Test
Pass
(Green)
RST/PWR
Fail
Data
Compare
Error
DTAK
Time
Out
BGAK
Time
Out
Data
Parity
Error
Bus
Error
Node
Address/Error
Display
EDAC
Single-Bit
Error
EDAC
Multi-Bit
Error
LCN
Transaction
Error
40022
Red LEDs
TX
(Yellow)
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