Mitsubishi L26CPU-BT, User Manual

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15 TROUBLESHOOTING
Description of problem Check item Check contents Check procedure Corrective action
Check if the SD LED and RD
LED are flashing at the faulty
station.
Connect the cable properly.
A2-5 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 cable properly.
Is the power on at the faulty
station?
Turn the power supply on.
A2-6
Power supply (for
communication) Is the power off or out of the
range of use?
Is the supplied power within the
specified range? 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. (recommended to keep
a distance of more than 100mm)
Check if the FG is separated from
the power system GND. Set FG and the power system
GND apart. A2-7 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.
A2-9 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.
A2-10
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.
A3-1 Cables
Is there any cable/connector
disconnected or out of
specifications?
Check the cable between the
master station and slave station. Connect the corresponding cable
properly.
A3-2 Parameter setting
Is not the sequence scan too
long? (synchronous mode)
Does the sequence scan time
exceed the tolerance?
10 Mbps : 50 ms
5 Mbps : 50 ms
2.5 Mbps: 100 ms
625 kbps: 400 ms
156 kbps: 800 ms Switch to the asynchronous
mode, or reduce the transmission
speed.
A3-3
Power supply (for
communication) Is the power off or out of the
range of use?
Check the power supply of the
master station and all slave
stations.
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. (recommended to keep
a distance of more than 100mm)
Check if the FG is separated from
the power system GND. Set FG and the power system
GND apart. A3-4 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.
A3-5 Master station failure Is the master station failed?
Check if the system operates
properly after replacing the
master station.
Fix or replace the master station.
Unable to link the
entire system
occasionally.
A3-6 Link stop
Is the data link stop instruction
being executed properly? Check if the data link stop
(SB0002) is turned on.
Disable the data link stop
(SB0002).
Do not use devices which read
SB002 simultaneously.
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