—
10 Troubleshooting
Diagnosis messages are shown in the engineering suite Automation Builder. The diagnosis
information can be accessed in the IEC application and can be forwarded to, e.g., a web server
or a control panel.
Some diagnosis messages need to be acknowledged by the user (alarms
), others do not
require acknowledgment (events
). The diagnosis system stores alarms and events in a diag-
nosis history.
Diagnosis messages include the severity of an error. Error severity can be used for defining
system behavior, e.g., activating the error LED or stop the PLC.
Diagnosis messages can also be read out from the display of the PLC.
Fault description
Cause
Remedy
A processor module, a com-
munication module or an I/O
module can not be plugged
on the corresponding terminal
base or terminal unit.
Terminal bases and terminal
units have a mechanical
encoding. The encoding makes
it impossible to insert a module
to the wrong place to prevent
dangerous voltages or destroyed
modules.
Check the given design scheme of your con-
trol cabinet.
Get in touch with the planner of the design
scheme.
Check the possible combinations in the PLC
The module does not respond
and is not available for online
connection.
Module is not connected to the
power supply. Or module is not
functional any more.
Check power supply.
Replace the module or HMI.
I/O module on a hot swap ter-
minal unit does not respond
and is not available for online
connection.
I/O module is not plugged or
damaged.
As soon as the correct and operational I/O
module is plugged on the terminal unit, the
module is configured and ready to start.
After hot swap of a (remote)
I/O module, the system
and/or I/O module does not
start.
Wrong I/O module type plugged.
The type must be the same as of
the replaced module.
Plug the correct I/O module type.
The display of the control
panel is black.
Control panel is not connected
to the power supply. Or control
panel is not functional any more.
Check power supply.
Replace the control panel.
ERR LED of the processor
module flashes fast. The dis-
play shows
“AC500”
.
A fatal system error occured.
Contact ABB technical support
ERR LED of the processor
module flashes. RUN LED is
off. The display shows
“FAIL”
.
Installation or update of firm-
ware, boot project or application
failed.
Restart the device. Perform the installation or
update again.
Chapter 9.2 “PLC firmware/application
ERR LED is on.
.
● Use Automation Builder, IEC application
or other external access available in your
project, e.g., a control panel, to read
out and acknowledge the diagnosis mes-
sages.
In Automation Builder, double-click on a
device and select the
“Diagnosis”
tab to
access the diagnosis messages.
Possible mal-
functions
Troubleshooting
2023/03/03
3ADR011074, 1, en_US
88