Honeywell UMC800 Installation And User Manual page 94

Diagnostics and Troubleshooting
Fault Detection and Troubleclearing
Controller
Diagnostic Summary
(In the User Utility and Operator
Interface)
Menu Status
Item
COMM A GOOD
COMM A BOARD
FAILURE
COMM A BOARD NOT
FOUND
COMM B GOOD
COMM B BOARD
FAILURE
COMM B
BOARD NOT
FOUND
PANEL
NORMAL
(OI)
86
Controller
LED on CPU
Possible Cause
POWER The COMM A port
LED flashes hardware has a
13 times. serious failure.
POWER The main CPU
LED flashes board has a non-
13 times default address
and no COMM
port installed.
POWER The COMM B port
LED flashes hardware has a
13 times. serious failure.
POWER The control file
LED flashes configuration
13 times requires a master
port and no Comm
Port is installed.
UMC800 Controller Installation and User Guide
Fault Detection / Troubleclearing
Controller Action
Executes normally.
Executes normally.
Executes normally.
All Modbus read
block outputs are
frozen at their last
read values.
Executes normally.
All Modbus read
block outputs are
frozen at their last
read values.
User Action
none
Replace Comm
board.
Install CPU with
optional RS 485
communications
(if not installed)
or set COMM A
station address to
255.
none
Replace CPU.
Install Comm
Board or
download a
configuration that
has no Modbus
slave blocks
none
Release F
4/01