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CHAPTER 11 TROUBLESHOOTING
11
11.4 Checking the LEDs
(7) When the L ER LED turns on
(8) When the LINK LED turns off
(9) When the ERR. LED turns on
(10)When the ALM 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 normally operate?
• 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 D/A converter module
normally operate?
Check if the power supplies of the other stations are turned on.
Is the mode of the module on the master station set to
Online?
Change the mode of the module 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 and other stations normally operate?
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 cause of the D/A converter module and take corrective
action with GX Works2.
Check item Action
Is any alert output? Check Alert output flag (RWrA).