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4 TROUBLESHOOTING
4.1 Checking with LED
When the LINK LED turns off
When the LINK LED turns off, check the following.
If the above actions do not solve the problem, perform the following tests to check for an error.
• Module communication test (
Page 221 Module communication test)
• Cable test (
Check item
Action
Do the used Ethernet cables conform to the Ethernet standard?
Replace the cables with the Ethernet cable which conforms the standard. (
MELSEC iQ-R Ethernet/CC-Link IE User's Manual (Startup))
Does the station-to-station distance meet the specifications?
Set the station-to-station distance within range. (
MELSEC iQ-R Ethernet/
CC-Link IE User's Manual (Startup))
Does the cabling condition (bending radius) meet the specifications?
Refer to the manual for the Ethernet cable, and correct the bending radius.
Is any Ethernet cable disconnected?
Replace the Ethernet cable.
Is the switching hub used operating normally?
• Check if the switching hub which conforms the standard is used. (
MELSEC iQ-R Ethernet/CC-Link IE User's Manual (Startup))
• Power off and on the switching hub.
Are other stations connected to the master/local module operating normally?
• Check if the modules on the other stations are performing data link using
CC-Link IE Field Network diagnostics. (
• Check the operation status of modules on other stations. (
User's
manual for the module used)
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