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Trouble
Item to check
description
Cables and
other devices
Supplied power
(for
communication)
Some stations
cannot be
data-linked
occasionally.
Noise
Start-up
Slave station
failure
To turn on/off Data link stop (address: 5E0
module is required.
Point to check
• 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 power is
disconnected or the voltage is
out of the specified range.
Is there any noise on the
transmission cable?
Have the stations been started
up in correct order?
Is any slave station broken?
.b2), a sequence program for accessing the remote buffer memory of the bridge
H
CHAPTER 9 TROUBLESHOOTING
Check method
Check the cable used for the
faulty station.
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).
Check the power supply of the
faulty station.
Is the transmission cable
located near the power cable?
Is the FG separated from the
power-cable GND?
Decrease the transmission
speed and check the frequency
of noise occurrence.
Start up the faulty stations in
different order, and check the
system.
Does the system operate
normally after the faulty slave
station has been replaced?
Corrective action
Connect the cable correctly.
Adjust the supply voltage so that
it is within the specified range.
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.)
Separate the FG from the
power-cable GND.
Take measures against noise.
Decrease the transmission
speed.
Start the faulty stations in the
order according to the manual
for each station.
Repair or replace the faulty
slave station.
97
9
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Table of Contents
Troubleshooting
