Mitsubishi Electric L26CPU-BT User Manual page 352

Description
Check item
of problem
A4-3 Noise
Some station(s)
cannot be linked
occasionally.
A4-4 Startup
Device station
A4-5
failure
Standby master
A4-6
station
350
Check contents
Is there any noise on the
transmission cable?
Is the startup sequence
correct?
Is the device station failed?
Is the standby master
station controlling the data
link?
Check procedure
Check if the transmission cable
and power wiring are separated
enough.
Check if the FG is separated
from the power system GND.
Reduce the transmission
speed and then check the
occurrence frequency.
Check by changing the startup
sequence of the failure station.
Replace the failed station and
check the operation.
Check if the master station
switching status is in the
standby master station, with
the master station CC-Link
diagnostics.
Corrective action
Wire the transmission
cable and power wiring as
separated as possible.
Set FG and the power
system GND apart.
Take measures against
noise.
Reduce the transmission
speed.
Startup with the procedure
described in the manual of
the corresponding station.
Fix or replace the failed
device station.
Reboot the system and set
the control by the master
station.