Mitsubishi Electric RD78G4 User Manual page 53

When the L ER LED turns on
When the L ER LED turns on, check the following.
Check item
Are the Ethernet cables used normally?
Is the switching hub used operating normally?
Is there any source of noise near the module or
cables?
When the LINK LED turns off
When the LINK LED turns off, check the following.
Check item
Do the used Ethernet cables conform to the
Ethernet standard?
Does the station-to-station distance meet the
specifications?
Does the cabling condition (bending radius) meet
the specifications?
Is any Ethernet cable disconnected?
Is the switching hub used operating normally?
Are other stations connected to the Motion module
operating normally?
Is the communication speed of connected devices
1Gbps?
Action
• Use an Ethernet cable that conforms to the standard. ( MELSEC iQ-R Motion Module User's
Manual (Startup))
• Set the station-to-station distance within range. ( MELSEC iQ-R Motion Module User's Manual
(Startup))
• If the Ethernet cable is disconnected, reconnect it.
• Use a switching hub that conforms to the standard. ( MELSEC iQ-R Motion Module User's Manual
(Startup))
• Power off and on the switching hub.
Change the location of the module or cables.
Action
Replace the cables with Ethernet cables which conform to the standard. ( MELSEC iQ-R Motion
Module User's Manual (Startup))
Set the station-to-station distance within range. ( MELSEC iQ-R Motion Module User's Manual
(Startup))
Refer to the manual for the Ethernet cable, and correct the bending radius.
Replace the Ethernet cable.
• Use a switching hub that conforms to the standard. ( MELSEC iQ-R Motion Module User's Manual
(Startup))
• Power off and on the switching hub.
Check the manual of the module used for the other stations and take action accordingly. ( User's
manual for the module used)
Connect devices which support a communication speed of 1Gbps.
3 TROUBLESHOOTING
3.1 Checking with LED
3
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