Specifications

Hardware Description of LCN Node Processors – HMPU Processor and Associated Boards
30 Application ModuleX Service 12/01
Honeywell
Indicator
description
The following table gives a description of the indicators on the HMPU
board. Reference the preceding diagram.
Table 3-3 HMPU Error Indicators
LED Description Suspected cause if abnormal
Pass Module Test On after board passes self-test.
Normally on.
HMPU
RST/PWR Fail On when a reset operation
caused by the reset button or
power on is in progress.
Normally off.
HMPU
Self-Test Error On to indicate a board self-test
error. Normally off.
HMPU
Data Compare Error On to indicate an on-board data
compare error. Normally off.
HMPU
DTAK Time Out On to indicate a Data Transfer
Acknowledge failure. Normally
off.
HMPU
BGAK Time Out On to indicate a Bus Grant
Acknowledge failure. Normally
off.
HMPU or other board(s) in
chassis
Data Parity Error On to indicate an on-board data
parity error. Normally off.
HMPU
Bus Error On to indicate a detected
backplane bus parity error.
Normally off.
HMPU, other board(s) in chassis,
or backplane
EDAC Single-Bit Error On to indicate a single-bit
(correctable) RAM error.
Normally off.
HMPU
EDAC Multiple-Bit Error On to indicate a multiple-bit
(uncorrectable) RAM error.
Normally off.
HMPU
Access Violation On to indicate a memory access
violation. Normally off.
(Frequently on with Bus error or
EDAC Multiple bit error
indicators.)
HMPU or another board in the
chassis.
Node Address/Error display This 3-digit display normally
displays the pinned LCN node
address. It will display error
codes for further problem
definition in error situations.
See Five/Ten-Slot Service
manual for multiple possible
causes. Reference >>Alpha
Numeric Displays in appendix A.