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CHAPTER 12 TROUBLESHOOTING
12
12.3 Checking the LEDs
12.3 Checking the LEDs
The following explains how to troubleshoot the system by the LEDs.
(1) The RUN LED turns off
If the above action does not solve the problem, perform the following tests on the master/local module to check for
hardware error.
• Hardware test ( Page 60, Section 6.2.1)
• Self-loopback test ( Page 62, Section 6.2.2)
(2) The MODE LED turns off or is flashing
If the above action does not solve the problem, perform the following tests on the master/local module to check for
hardware error.
• Hardware test ( Page 60, Section 6.2.1)
• Self-loopback test ( Page 62, Section 6.2.2)
(3) The D LINK LED turns off or is flashing
Check item Action
Is the master/local module mounted correctly? Securely mount the master/local module on the safety base unit.
Check item Action
Is the master/local module set to online mode?
Change the mode of the master/local module to Online.
( Page 79, Section 7.2)
Check item Action
Is the master station connected to the network and operating
normally?
• If an error has occurred in the CPU module of the master station,
remove the cause of the CPU module error.
( Page 235, Section 12.2)
• Connect a programming tool, which is supported by the programmable
controller used, to the master station. Check if the master station is
performing data link using CC-Link IE Field Network diagnostics, and
take action. ( Page 124, CHAPTER 9)
When the master station is the module of the MELSEC-QS series, and
there is a local station of the MELSEC iQ-R series module, refer to the
following.
( Page 320, Appendix 8)
Are 1000BASE-T-compliant Ethernet cables used?
Replace the cables with 1000BASE-T-compliant Ethernet cables.
( Page 56, Section 5.2.1)
Is the station-to-station distance 100m or less? Change the station-to-station distance to 100m or less.
Does the cabling condition (bend radius) meet the
specification?
Refer to the manual for the Ethernet cable, and correct the bend radius.
Is any Ethernet cable disconnected? Replace the Ethernet cable.
Is the loopback function enabled for the master station? Configure the network in ring topology without a switching hub.
Are other stations connected to the master/local modules
operating normally?
Power on the other stations.
Is the switching hub operating normally?
• Check if a 1000BASE-T-compliant switching hub is used.
( Page 57, Section 5.2.2)
• Power off and then on the switching hub.