Mitsubishi Electric QJ71GF11-T2 - When the ERR. LED Turns on; When the ERR. LED Is Flashing; When the L ERR. LED Turns on

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If the above actions do not solve the problem, perform the following tests on the master/local module to check for an
error.
• Hardware test ( Page 64, Section 6.2.1)
• Self-loopback test ( Page 66, Section 6.2.2)
• Loop test ( Page 71, Section 6.4.1)
• Cable test ( Page 78, Section 6.4.2)
(4) When the ERR. LED turns on
Connect GX Works2 to the CPU module mounted with the master/local station whose ERR. LED is on, identify
the cause of the error, and take action. ( Page 426, Section 12.2)
If the cause of the error cannot be identified using GX Works2, perform the following tests to the master/local
module to check for hardware error.
• Hardware test ( Page 64, Section 6.2.1)
• Self-loopback test ( Page 66, Section 6.2.2)
(5) When the ERR. LED is flashing
If the above action does not solve the problem, "Total Stations" set in the Network Parameter window for the
master station differs from the number of slave stations on the network. Correct the parameter.
(6) When the L ERR. LED turns on
If the above actions do not solve the problem, follow the directions shown in "Communication is unstable". ( Page
436, Section 12.4.5)
Check item Action
Is the disconnected station displayed in the network map of the
CC-Link IE Field diagnostics?
Perform the troubleshooting shown in "When the D LINK LED turned off
or is flashing". ( Page 431, Section 12.3 (3))
Check item Action
Are the Ethernet cables operating normally?
• Check if 1000BASE-T-compliant Ethernet cables are used.
( Page 34, Section 3.2)
• Check if the station-to-station distance is 100m or less.
( Page 70, Section 6.3 (2))
• Check if the Ethernet cables are not disconnected.
Is the switching hub operating normally?
• Check if a 1000BASE-T-compliant switching hub is used.
( Page 60, Section 5.3.2)
• Check if the switching hub is on.
Are other stations connected to the master/local modules
operating normally?
Check if the systems on other stations are on.
Is the master station set to online mode?
Change the mode of the module to Online. ( Page 84, Section 7.2)
Is there any noise affecting the system? Check the wiring condition.
Is the loopback function enabled for the master station?
When the loopback function is enabled, check if the ring topology is
correctly configured for the port where the L ERR. LED is on.
( Page 49, Section 5.2.1)