Mitsubishi Electric NZ2GF-CCB, User Manual

Page: 99 / 150

97
CHAPTER 9 TROUBLESHOOTING
9
9.
7
T
roubleshoot
ing by
Sy
mpt
o
m
To turn on/off Data link stop (address: 5E0
H
.b2), a sequence program for accessing the remote buffer memory of the bridge
module is required.
Some stations
cannot be
data-linked
occasionally.
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 the cable used for the
faulty station.
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).
Supplied power
(for
communication) Check if the power is
disconnected or the voltage is
out of the specified range.
Check the power supply of the
faulty station. 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.
Start-up
Have the stations been started
up in correct order?
Start up the faulty stations in
different order, and check the
system. Start the faulty stations in the
order according to the manual
for each station.
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