Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 116

Problem Check item
A station cannot A2-1
perform data link.
A2-2
A2-3
A2-4
A2-5
A2-6
A2-7
A2-9
9 TROUBLESHOOTING
114
9.4 Troubleshooting by Symptom
Description
Station No. Is the station number correctly set
for the faulty station?
Transmission Is the transmission speed setting
speed correctly set for the faulty station?
Online status Is the CC-Link interface of the
(slave station) faulty station online?
Parameter • Are the module parameters,
Setting such as number of stations and
station information, correctly
set?
• Does the master station have
no error?
• Module parameters in the
engineering tool.
Cable or other Are there no disconnection, short
parts circuit, incorrect wiring, poor
connection, and coexistence of
different cables? Do a
transmission distance, station-to-
station distance, transmission
cable, and FG terminal grounding
meet the specifications?
Are terminating resistors
connected?
Power supply (for Is the power on, and is the applied
communications) voltage within the specified
range?
Noise Is the transmission cable free from
noise?
Failure of a slave Do slave stations normally
station operate?
Check method
Check the station number setting.
Check the transmission speed.
Check the status of the faulty
station.
Check the module parameters of
the CPU module on the master
station using the engineering tool.
Check SW0068, SW0069,
SW0070, SW0071, SW0072,
SW0074, SW0075, SW0098,
SW0099, SW009C, SW009D,
SW0144, and SW0145.
Check if the SD LED and RD LED
on the faulty station are flashing.
When faulty stations occur
sequentially to one end on the
transmission path, check cables
connected to faulty stations close
to the master station. (Multiple
stations)
Check if terminating resistors are
connected to the both ends in the
CC-Link system.
Check if a station with built-in
terminating resistor is connected
other than at both ends in the CC-
Link system.
Check if the modules on the faulty
station are powered on.
Check if the applied voltage is
within the specified range.
Check if the transmission cable is
away from the power cable.
Check if the FG terminal is
grounded separated from the
GND terminal of the power
system.
Reduce the transmission speed
and check if the frequency of
occurrence of noise is reduced.
Replace modules on the faulty
station and check if the station
normally operates.
Corrective Action
Correct the station number setting.
Set the same transmission speed
as that set for other stations.
Set it online.
• Correct the module parameters.
• Format the CPU module
memory then write the module
parameters.
Correct the wiring.
Correct the wiring.
Connect terminating resistors to
the both ends in the CC-Link
system.
Power on the module.
Apply the voltage within the
specified range.
Keep the transmission cable away
from the power cable. (Keep a
distance of 100 mm or more is
recommended)
Ground the terminals separately.
Take measures to reduce noise.
Reduce the transmission speed.
Repair or replace the module on
the faulty station.