Mitsubishi L26CPU-BT, User Manual

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15 TROUBLESHOOTING
Description of problem Check item Check contents Check procedure Corrective action
Check the cable at the faulty
station.
A4-1 Cables
Is there any disconnection, short-
circuit, incorrect wiring, faulty
connection, or status out of
specifications (transmission
distance, distance between
stations, transmission cable,
coexistence of different cables or
FG connection)?
Check the cable of the closest
faulty station from the master
station, when multiple stations are
sequentially faulty to the terminal
of the transmission path. (multiple
stations)
Connect the corresponding cable
properly.
A4-2
Power supply (for
communication) Is the power off or out of the
range of use? Check the power supply at the
faulty station. Set the supplied voltage to within
the specified range.
Check if the transmission cable
and power wiring are separated
enough. Wire the transmission cable and
power wiring as separated as
possible.
Check if the FG is separated from
the power system GND. Set FG and the power system
GND apart.
A4-3 Noise
Is there any noise on the
transmission cable?
Reduce the transmission speed
and then check the occurrence
frequency.
Take measures against noise.
Reduce the transmission speed.
A4-4 Startup Is the startup sequence correct?
Check by changing the startup
sequence of the failure station.
Startup with the procedure
described in the manual of the
corresponding station.
A4-5 Slave station failure Is the slave station failed?
Replace the failed station and
check the operation. Fix or replace the failed slave
station.
Some station(s)
cannot be linked
occasionally.
A4-6
Standby master
station Is the standby master station
controlling the data link?
Check if the master station
switching status is in the standby
master station, with the master
station CC-Link diagnostics.
Reboot the system and set the
control by the master station.