Mitsubishi Electric MELSEC SW1DNC-CCIEF-B User Manual page 165

Item
Check for any of the following wiring conditions.
• Connecting both PORT1 and PORT2 to the switching hub
• Although the loopback function is disabled, the network is configured
in ring topology.
• Although the loopback function is enabled, the network is configured in
star topology.
• The network is incorrectly configured in ring topology.
Is the station number duplicated with any of other stations?
Is the board hardware operating normally?
L ERR. LED/L ER LED is turned ON
An error has occurred due to received data or loop. The L ER LED of the PORT which detected the error is turned ON.
The error detail can be checked with the CC-Link IE Field Network diagnostics. (Page 119 Displaying diagnostics screen)
L ERR. LED is turned OFF automatically when a normal data is received or the loopback function is not performed in a ring
topology.
Item
Are cables and wiring normal?
Are the connected other stations normal?
Is the master station set to online mode?
Is the installation environment within the specifications? Is there any
noise influence?
Is the loopback function enabled for the master station?
Is the board hardware operating normally?
LINK LED is turned OFF
This indicates a status in which the board can not communicate (link down).
Item
Are cables and wiring normal?
Are the connected other stations normal?
Is the board hardware operating normally?
Corrective action
Correct the wiring. (Page 20 Single Network System)
<The system does not contain a switching hub.>
• When not using the loopback function
Disconnect an Ethernet cable connected to any stations on the network (either
PORT1 or PORT2).The network topology will become a line topology and data
link will start.
• When using the loopback function
Enable the loopback function and rewrite the network parameter. (Page 78
Loopback Function)
<The system contains a switching hub.>
• Check if the loopback function setting is correctly configured. (Page 78
Loopback Function)
If incorrect, correct the network parameter and rewrite it. When data link starts
over the network, the action is successful.
• Disconnect one Ethernet cable connected to the switching hub and power OFF
and then ON the hub. (Repeat this operation until data link starts over the
network.)
• When data link starts over the network, check the network configuration by CC-
Link IE Field Network diagnostics. (Page 118 Diagnosing CC-Link IE Field
Network)
Change the duplicated station number.
Perform the board test. (Page 161 Board test)
Corrective action
• Check the cables and wiring. (Page 157 Checking cables and wiring)
• Perform a cable test. (Page 55 Cable test)
Check if the other station's power is turned ON.
Change the mode of the master station to online. (Page 99 Setting Network
Parameter)
Check the installation environment. (Page 157 Checking installation
environment)
When the loopback function is enabled, check if the ring topology is correctly
configured for the port where the L ER LED is on. (Page 25 Configuration in
which data link cannot be performed (incorrect ring topology))
Perform the board test. (Page 161 Board test)
Corrective action
• Check the cables and wiring. (Page 157 Checking cables and wiring)
• Perform a cable test. (Page 55 Cable test)
Check if the other station's power is turned ON.
Perform the board test. (Page 161 Board test)
16 TROUBLESHOOTING
163
16.7 Checking method
16