When the RUN LED does not turn on
Does the voltage of the module power supplied externally reach to the
voltage of the specifications?
Does any hardware error occur?
When the MODE LED flashes
Is the I/O module in execution of the unit test?
When the ERR. LED flashes or turns on
Has any error occurred?
When the D LINK LED turns off
Does the own station in network operate normally?
Are 1000BASE-T-compliant Ethernet cables used?
Is the station-to-station distance 100m or less?
Does the cabling condition (bending radius) meet the specifications?
Is any Ethernet cable disconnected?
Do other stations connected to the I/O module normally operate?
Does the switching hub normally operate?
Is the station number of the I/O module duplicated with any of other
When the D LINK LED flashes
Does the station number setting of the I/O module match the station
number of the I/O module set in the network configuration settings of
the master station or in the CC IE Field Configuration?
Is the station type remote device station?
Is the I/O module a reserved station?
Is the station number setting switch set to other than 1 to 120?
Is stop of the data link checked through CC-Link IE Field Network
Has the connection been changed to the other master station with a
different network number?
Check that module power supply voltage is within the range of performance
specifications. (Page 20 I/O Module Specifications)
After the check, power off and on the module.
If the RUN LED does not turn on even after the module power supply is turned off and
on, the possible cause is a module failure. Please consult your local Mitsubishi
When the I/O module is in execution of the unit test, the MODE LED turns off after the
unit test is completed. Take corrective action according to the result of the unit test.
( Page 131 Unit Test)
Identify the error factor of the I/O module with the engineering tool to take the
corrective action. ( Page 121 Checking for the Error Codes and the Warning
Connect the engineering tool to the master station, and then check that a data link is
established in the own station by using CC IE Field diagnostics. ( User's manual
for the master/local module used)
Replace the cable with a 1000BASE-T-compliant Ethernet cable. ( User's manual
for the master/local module used)
Change the station-to-station distance to 100m or less.
Refer to the manual for the Ethernet cable used, and correct the bending radius.
Replace the Ethernet cable.
Check that the power supplies of the other stations are turned on.
• Check that a 1000BASE-T-compliant switching hub is used. ( User's manual for
the master/local module used)
• Check that the power supply of the switching hub is turned on.
Two or more stations are duplicated.
Change the setting so that all the station numbers are different.
Match the station number of the I/O module with the station number set in the network
configuration settings of the master station or in the CC IE Field Configuration.
Change the station type to the remote device station in the network configuration
settings of the master station.
Change the setting of reserved/error invalid station to other than the reserved station
in the network configuration settings of the master station.
Change the setting within the range from 1 to 120.
Check the link status through CC-Link IE Field Network diagnostics and start the link
when the data link is stopped.
• Correct the connection to the previous master station.
• To communicate with the master station with a different network number, power off
and on the I/O module.
11.3 Checking the LEDs