Lists Of Problems; Problems Due To Disconnection Of A Slave Station - Mitsubishi Electric MELSEC-Q Series User Manual

11.2

Lists of Problems

11.2.1

Problems due to disconnection of a slave station

(1) Problems due to disconnection of a slave station when a CC-Link system is
newly configured or the existing CC-Link system is changed
Problem Check item
A1-1 Station number
Transmission
A1-2
speed
A1-3 Mode
Parameter
A1-4
setting
Data link
cannot be
performed in
the entire
system.
Cable or other
A1-5
parts
276
Description
Is the station number correctly
set for the faulty station?
Are the transmission speed
values set within the range
and same between the master
station and slave stations?
Is the online mode set to the
master station?
• Are the network parameters
for CC-Link, such as the
number of stations and
station information,
correctly set?
• Does the master station
have no error?
• Are the network parameters
for a network other than
CC-Link correctly set?
Are the settings correct?
(Automatic CC-Link startup)
Are there no disconnection,
short 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?
Check method
Check the station number setting.
Check the transmission speed
values of all stations.
Check the mode of the master
station.
Check the network parameters of
the CPU module on the master
station using the programming
tool.
Check Host station number
(SW0061) and Mode setting
status (SW0060).
Check SW0068, SW0069,
SW0070, SW0071, SW0072,
SW0074 to SW0077, SW0098 to
SW009B, SW009C to SW009F,
and SW0144 to SW0147.
Check if values are not set in the
intelligent function module switch
setting.
Check if cables between the
master station and slave stations
are not disconnected.
Check if a station with built-in
terminating resistor is connected
other than at 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.
Corrective action
Correct the setting.
Correct the value.
Set the online mode.
Correct the network
parameter.
Format the CPU
module memory then
write the network
parameters.
Disable the intelligent
function module switch
setting of the
programming tool.
Correct the wiring.
Connect terminating
resistors to the both
ends in the CC-Link
system.
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