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Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 118

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When the system has already operated
Problem
Check item
Data link cannot
B1-1
be performed in
the entire
system.
B1-2
B1-3
B1-4
B1-5
B1-6
A station cannot
B2-1
perform data link
occasionally.
B2-2
B2-3
B2-4
9 TROUBLESHOOTING
116
9.4 Troubleshooting by Symptom
Description
CPU module
Does the CPU module on the
master station have no error?
Power supply (for
Is a voltage low?
communications)
Cable or other
Are there no disconnection, short
parts
circuit, and poor connection?
Noise
Is the transmission cable free from
noise?
Failure of the
Do modules on the master station
master station
normally operate?
Link stop
Is the data link stop instruction
correctly executed?
Power supply (for
Is a voltage low?
communications)
Cable or other
Are cables and connectors
parts
securely connected and do they
meet specifications?
Noise
Is the transmission cable free from
noise?
Failure of a slave
Do slave stations normally
station
operate?
Check method
Check the error code of the CPU
module.
Check if the module has been
identified.
Check power supplied to the
master station and all slave
stations.
Check if cables between the
master station and slave stations
are not disconnected.
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 the modules and check if
the station normally operates.
Check if 'Data link stop' (SB0002)
is turned off.
Check power supplied to the faulty
station.
Check cables connected to the
faulty station.
When faulty stations occur
sequentially to one end on the
transmission path, check cables
connected to faulty stations close
to the master station.
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
Remove the CPU module error.
(MELSEC iQ-F FX5 User's
Manual (Application))
Take action so that the CPU
module may identify the master/
intelligent device module.
(MELSEC iQ-F FX5 User's
Manual (Application))
Apply the voltage within the
specified range.
Correct the wiring.
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 master station.
• Do not turn on 'Data link stop'
(SB0002).
• Do not write to the refresh
source device of 'Data link stop'
(SB0002) from multiple
locations.
Apply the voltage within the
specified range.
Correct the wiring.
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.
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