Fault description
Cause
Remedy
ERR LED is on.
edged alarm
.
Or:
● Read out the diagnosis data on the display
of the processor module.
The display of the pro-
cessor module shows
“Demo”
for 5 min at every
license check. (For processor
modules without display only
visible when logged in with
Automation Builder.)
PLC runs in demo mode
because at least one feature
license is missing. The demo
license is valid for 10 days PLC
in run. After this time, PLC will go
to stop mode.
You can buy the missing license or extend the
demo license via Automation Builder. The PLC
will not switch back to run mode until a new
license is activated or the licensed features
are removed from the PLC application.
Every 10 min, the display of
the processor module shows
“Grace”
for 5 min.
PLC runs in grace mode
because at least one feature
license which has been available
disappeared. If the grace time
expires, PLC will go to stop
mode.
You need to buy or activate the missing. We
recommend to use the Automation Builder for
activation. After the PLC is in stop mode, it
will not switch back to run mode until a new
license is activated or the licensed features
are removed from the PLC application.
The CPU displays
“noConn”
(no connection).
No communication between CPU
and display is possible due do
very high CPU load (e.g., end-
less loop in user program and
not activated task watchdog).
Check the application for loops and operations
they need time. For example file handling.
Wait for response from other device who will
block the execution from other code.
If a problem persists, contact ABB technical support.
Troubleshooting
2023/03/03
3ADR011074, 1, en_US
89