Mitsubishi Electric MELSEC L Series User Manual page 94

(5) When the D LINK LED turns off
Is the master station connected to the network and operating
normally?
Are the Ethernet cables correctly used and connected?
Are the switching hub and other stations connected to the head
module operating normally?
Is the switching hub used in the system operating normally?
Isn't the station number of the head module overlapping with
any of the other stations?
Does the network number of the head module match that of the
connected network?
If the above actions do not solve the problem, perform the following tests on the head module to check for an
error.
• Unit test (
• Cable test (
(6) When the D LINK LED flashes
Are the STATION NO. LEDs of the head module correctly
showing the station number specified in Network Configuration
Setting of the master station?
If the above actions do not solve the problem, connect GX Works2 to the master station and execute the CC-Link
IE Field Network diagnostics. (
(7) When the ERR. LED turns on
Identify the cause of the error using GX Works2, and take action. (
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Page 45, Section 6.4)
Page 80, Section 9.5)
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• If an error has occurred in the CPU module on the master station,
eliminate the cause of the CPU module error. (
for the master/local module used)
• Connect GX Works2 to the master station, and check if the master
station is performing data link by executing the CC-Link IE Field
Network diagnostics. (
module used)
• Check if 1000BASE-T-compliant Ethernet cables are used. (
Page 26, Section 3.2)
• Check if the station-to-station distance is 100m or less. (
50, Section 6.5.3)
• Check if the Ethernet cables are not disconnected.
Check if the switching hub and other stations are powered on.
Check if a 1000BASE-T-compliant switching hub is used. (
manual for the master/local module used)
Change the station number so that it does not overlap.
Match the network number of the head module to that of the connected
network.
• Have the station number of the actual head module and the one
specified in Network Configuration Setting of the master station
matched.
• Execute the format PLC memory function to the head module using
GX Works2, and then write PLC parameters again.
User's manual for the master/local module used)
Action
User's manual
User's manual for the master/local
Action
Page 84, Section 11.2)
Page
User's