95
CHAPTER 9 TROUBLESHOOTING
9
9.
7
T
roubleshoot
ing by
Sy
mpt
o
m
The entire
system cannot
be data-linked.
Noise
Is there any noise on the
transmission cable?
Is the transmission cable
located near the power cable?
Wire the transmission cable and
the power cable as far as
possible from each other. (It is
recommended that they be
wired with a distance of 100mm
or more between them.)
Is the FG separated from the
power-cable GND?
Separate the FG from the
power-cable GND.
Decrease the transmission
speed and check the frequency
of noise occurrence.
Take measures against noise.
Decrease the transmission
speed.
Bridge module
failure
Is the bridge module broken?
Replace the bridge module and
check if it operates normally.
Repair the bridge module or
replace it.
Some stations
cannot be
data-linked.
Station number
Is the station number of the
faulty station wrong?
Check the setting for the station
number of the faulty station.
Set the station number correctly.
Transmission
speed
Is the transmission speed of the
faulty station wrong?
Check the setting for the
transmission speed of the faulty
station.
Adjust the transmission speed
to a specified one.
Online status
(Slave station)
Check if the faulty station is in
the online status.
Check the status of the faulty
station.
Change the status of the faulty
station to online.
Cables and
other devices
• Check the cable and other
tools for disconnection, short
circuit, incorrect wiring, poor
contact, and usage not
meeting the specifications
(transmission distance,
station-to-station distance,
coexistence of different types
of cables, and FG connection).
• Check if a transmission cable
other than a CC-Link
dedicated cable is used.
Check if the SD LED and the
RD LED of the faulty station are
flashing.
Connect the cable correctly.
When multiple faulty stations
exist successively up to the end
of the transmission path, check
the cable of the stations close to
the bridge module (multiple
stations).
Connect the cable correctly.
Supplied power
(for
communication)
Check if the power is
disconnected or the voltage is
out of a specified range.
Are the faulty stations on?
Turn on the power supply.
Is the supply voltage within a
specified range?
Adjust the supply voltage so that
it is within the specified range.
Noise
Is there any noise on the
transmission cable?
Is the transmission cable
located near the power cable?
Wire the transmission cable and
the power cable as far as
possible from each other. (It is
recommended that they be
wired with a distance of 100mm
or more between them.)
Is the FG separated from the
power-cable GND?
Separate the FG from the
power-cable GND.
Decrease the transmission
speed and check the frequency
of noise occurrence.
Take measures against noise.
Decrease the transmission
speed.
Slave station
failure
Is any slave station broken?
Does the system operate
normally after the faulty slave
station has been replaced?
Repair or replace the faulty
slave station.
Trouble
description
Item to check
Point to check
Check method
Corrective action
Содержание NZ2GF-CCB
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