User`s guide

On-line Monitoring and Diagnostics
Controller Diagnostics
216 UMC800 Control Builder User’s Guide Release E
1/01
Class Status Possible Cause Controller Action User Action
I/O BAD BACKPAN ID Incompatible
backplane board
Analog inputs
use default
coefficients.
1. Disconnect then
reconnect power.
2. Replace backplane
board.
COMM A Port
Status
GOOD N/A N/A N/A
REQUIRES
SETUP
Both the Comm Port
and the main CPU
board have a default
address (255).
PORT setting is
set to disabled.
Initialize the Modbus
address.
FORCED
OFFLINE
The main CPU and
Comm Port had a
configuration
mismatch.
If the Comm Port
had a default
address, the
main CPU
settings are used.
If the main CPU
had a default
address, the
Comm Port
settings are used.
If the main CPU
and the Comm
Port both had
valid addresses,
the Comm Port
settings are used.
In all cases, the
PORT setting is
set to disabled.
Check Modbus settings and
set PORT to enabled.
BOARD FAILURE The Comm Port
hardware has a
serious failure.
Executes
normally.
Replace Comm Port.
BOARD NOT
FOUND
The control file has a
non-default address
and no Comm Port is
installed.
Executes
normally.
Install Comm Port or set
address to 255.
COMM B
Port Status
GOOD N/A N/A N/A
BOARD FAILURE
The Comm Port
hardware has a
serious failure.
Executes
normally. All
Modbus Read
block outputs are
frozen at their last
values.
Replace Comm Port.
BOARD NOT
FOUND
The control file
configuration requires
a master Port and no
Comm Port is
installed.
Executes
normally.
Install Comm Port or
download a configuration
that has no Modbus Slave
blocks.