Mitsubishi Electric NZ2GN2S1-32D User Manual page 140

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?
Are the modules where the state (enable/disable) of the fast link-up
function is the same connected to each other?
For the modules to be connected to each other with the fast link-up
function being enabled, are P1 and P2 connected with a cable?
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 86 Wiring of Ethernet Cable
11 TROUBLESHOOTING
138
11.2 Checking the LEDs
Action
Identify the error factor of the I/O module with the engineering tool to take the
corrective action. ( Page 154 Method for Checking Error Codes)
Action
Replace the cable with an Ethernet cable compliant with the relevant standard. (
User's manual for the master/local module 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 that meets the specifications of the master module in
use is used. ( User's manual for the master/local module used)
• Disconnect Ethernet cables, and then reconnect them.
• Power off and on the switching hub.
For the ports connected to each other, set the same state (enable/disable) for the fast
link-up function. And then power off and on the modules.
In addition, disable the fast link-up function for the port that is to be connected to the
port where the fast link-up function is not supported.
Connect P1 and P2 with a cable when connecting modules where the fast link-up
function is enabled.