Mitsubishi Electric NZ2GN2S1-16D User Manual page 197

When the ERR. LED turns on or flashes
When the ERR. LED turns on or flashes, check the following items.
Check item
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.
Check item
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?
Does the connected device support the communication speed of the I/O
module?
When the communication speed of the I/O module is set to 100Mbps, is
auto-negotiation of the connected device enabled?
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 133 Wiring of Ethernet Cable
Action
Identify the error factor of the I/O module with the engineering tool to take the
corrective action. ( Page 211 Method for Checking Error Codes)
Action
Replace the cable with an Ethernet cable compliant with the relevant standard.
( User's manual for the master station used)
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. ( User's manual for the master station used)
• Disconnect Ethernet cables, and then reconnect them.
• Power off and on the switching hub.
• When function setting switch 10 is set to OFF, connect to a device that can
communicate at 1Gbps, and when function setting switch 10 is set to ON,
connect to a device that can communicate at 100Mbps.
• When the firmware version of the I/O module is "01", either perform a firmware
update or connect to a device that can communication at 1Gbps.
Enable auto-negotiation of the connected device.
Alternatively, connect a device with auto-negotiation enabled.
11 TROUBLESHOOTING
195
11.2 Checking the LEDs
11