When the ERR. LED turns on or flashes
When the ERR. LED turns on or flashes, check the following items.
Has any error occurred?
When the P1 LINK LED or P2 LINK LED turns off
When the P1 LINK LED or P2 LINK LED turns off, check the following items.
Are Ethernet cables used compliant with the relevant standard?
Is the segment length 100m or less?
Does the cabling condition (bending radius) meet the specifications?
Is any Ethernet cable disconnected?
Do other stations connected to the I/O module normally operate?
Does the switching hub in use normally operate?
If link-up processing is repeated due to a condition of a device on the line, it may take a longer time for the P1
LINK LED/P2 LINK LED to turn on.
This phenomenon may be eliminated by changing the PORT of the relevant module to which the Ethernet
cable is connected (example: PORT1→PORT2).
For details on Ethernet cable wiring, refer to the following.
Page 67 Wiring of Ethernet Cable
Identify the error factor of the I/O module with the engineering tool to take the
corrective action. ( Page 106 Method for Checking Error Codes)
Replace the cable with an Ethernet cable compliant with the relevant standard. (
MELSEC iQ-R CC-Link IE TSN User's Manual (Startup))
Change the segment length to 100m or less.
Refer to the manual for the Ethernet cable used, and correct the bending radius.
Replace the Ethernet cable.
Check that the power supplies of the other stations are turned on.
• Check that the power supply of the switching hub is turned on.
• Check that the switching hub compliant with the specifications of the master module
in use is used. ( MELSEC iQ-R CC-Link IE TSN User's Manual (Startup))
11.2 Checking the LEDs