Checking The Leds - Mitsubishi Electric MELSEC-Q Series User Manual

12.3 Checking the LEDs

The following explains how to troubleshoot the system by the LEDs.
Refer to the "MELSEC-Q QD77GF Simple Motion Module User's Manual (Positioning
Control)" together.
(1) The D LINK LED turns off or is flashing
Check item
Is the master station connected to the network and operating
normally?
Are 1000BASE-T-compliant Ethernet cables used?
Is the station-to-station distance 100m or less?
Does the cabling condition (bend radius) meet the
specification?
Is any Ethernet cable disconnected?
Are slave stations more than the number of stations that can
be controlled connected?
Are other stations connected to the Simple Motion module
operating normally?
Is the switching hub operating normally?
Check that the cables are not connected as described below.
• The network is configured in ring topology.
Is the station number of the Simple Motion module duplicated
with any of the other stations?
• If an error has occurred in the CPU module of the master station, remove
the cause of the CPU module error. (Refer to Section 12.2.)
• Connect GX Works2 to the master station. Check if the master station is
performing data link using CC-Link IE Field Network diagnostics, and take
action. (Refer to Chapter 9.)
Replace the cables with 1000BASE-T-compliant Ethernet cables.
(Refer to Section 5.2.1.)
Change the station-to-station distance to 100m or less.
Refer to the manual for the Ethernet cable, and correct the bend radius.
Replace the Ethernet cable.
Change the connection of the slave stations to the number of connectable
stations per network.
Power on the other stations.
• Check if a 1000BASE-T-compliant switching hub is used.
(Refer to Section 5.2.2.)
• Power off and then on the switching hub.
• Correct the wiring. (Refer to Section 5.1.1.)
• If the system contains a switching hub.
1. 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.)
2. When data link starts over the network, check the network configuration
by CC-Link IE Field Network diagnostics.
(Refer to Chapter 9.)
Change the duplicated station number.
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Chapter 12 TROUBLESHOOTING
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