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CHAPTER 11 TROUBLESHOOTING
11
11.
4
Check
ing t
he LE
Ds
(7) When the L ER LED turns on
(8) When the LINK LED turns off
If link-up processing is repeated due to a condition of a device on the line, it may take a longer time for the LINK LED to turn
on. This phenomenon may be eliminated by changing the module PORT into which the Ethernet cable is connected
(example: PORT1
PORT2). For the wiring of Ethernet cable, refer to the following.
(9) When the ERR. LED turns on
Check item
Action
Are Ethernet cables normal?
• Check if 1000BASE-T-compliant Ethernet cables are used. (
User's manual for
the master/local module used)
• Check if the station-to-station distance is 100m or less.
• Check if the Ethernet cables are not disconnected.
Does the switching hub used in the system operate normally?
• Check if a 1000BASE-T-compliant switching hub is used. (
User's manual for the
master/local module used)
• Check if the power supply of the switching hub is turned on.
Do other stations connected to the main D/A converter module
operate normally?
Check if the power supplies of the other stations are turned on.
Is the mode of the master station set to other than Online?
Change the mode of the master station to Online.
Is there any noise affecting the system?
Check the wiring condition of the Ethernet cables.
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 ER LED is on. (
User's manual for the
master/local module used)
Check item
Action
Are Ethernet cables normal?
• Check if 1000BASE-T-compliant Ethernet cables are used. (
User's manual for
the master/local module used)
• Check if the station-to-station distance is 100m or less.
• Check if the Ethernet cables are not disconnected.
Do the switching hub used in the system and other stations operate
normally?
Check if the power supplies of the switching hub and other stations are turned on.
Check item
Action
Does any error occur?
Identify the error factor of the D/A converter module with the engineering tool to take
corrective action.