Mitsubishi Electric RD77GF8 User Manual page 103

When the D LINK LED turns off or is flashing
When the D LINK LED turns off or is flashing, check the following.
Check item
Is the master station operating normally?
Is the master station connected to the network?
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?
Are 121 or more slave stations connected?
Are other stations connected to the Simple Motion module operating
normally?
Is the switching hub used operating normally?
Are station Nos. unique?
The devices having different network types (such as CC-Link IE Controller
Network and CC-Link IE Controller Network) are connected to the same
network line.
If the above actions do not solve the problem, perform the following tests to check for an error.
• Cable test (Page 116 Cable Test)
When the L ERR LED turns on
When the L ERR LED turns on, check the following.
Check item
Are the Ethernet cables used normally?
Is the switching hub used operating normally?
Are other stations connected to the Simple Motion module operating
normally?
Is "Module Operation Mode" under "Application Settings" of the master station
set to "Online"?
Is there any source of noise near the module or cables?
If the above actions do not solve the problem, perform troubleshooting for when communication is unstable. (Page 126
When communication is unstable)
Action
• If an error has occurred in the CPU module on the master station, eliminate
the cause of the CPU module error. (MELSEC iQ-R CPU Module User's
Manual (Application))
• Check if the master station is performing data link using CC-Link IE Field
Network diagnostics. (Page 105 Checking the Network Status)
Check if the master station is performing data link using CC-Link IE Field
Network diagnostics. (Page 105 Checking the Network Status)
Replace the cables with the Ethernet cable which conforms the standard.
(MELSEC iQ-R Simple Motion Module User's Manual (Startup))
Set the station-to-station distance within range. (MELSEC iQ-R Simple
Motion Module User's Manual (Startup))
Refer to the manual for the Ethernet cable, and correct the bending radius.
Replace the Ethernet cable.
Change the connection of the slave stations to 120 stations or less.
• Check if the modules on the other stations are performing data link using
CC-Link IE Field Network diagnostics. (Page 105 Checking the Network
Status)
• Check the operation status of modules on other stations. (User's manual
for the module used)
• Check if the switching hub which conforms the standard is used.
(MELSEC iQ-R Simple Motion Module User's Manual (Startup))
• Power off and on the switching hub.
Change the duplicated station No.
Divide it into CC-Link IE Controller Network (Ethernet cable) and the network.
After taking the above actions, power off and on or reset all stations where the
error was detected.
Action
• Check if the Ethernet cable which conforms the standard is used.
(MELSEC iQ-R Simple Motion Module User's Manual (Startup))
• Check if the station-to-station distance is set within range. (MELSEC iQ-
R Simple Motion Module User's Manual (Startup))
• Check if the Ethernet cables are not disconnected.
• Check if the switching hub which conforms the standard is used.
(MELSEC iQ-R Simple Motion Module User's Manual (Startup))
• Power off and on the switching hub.
• Check if the modules on the other stations are performing data link using
CC-Link IE Field Network diagnostics. (Page 105 Checking the
Network Status)
• Check the operation status of modules on other stations. (User's
manual for the module used)
Set "Module Operation Mode" under "Application Settings" of the master
station to "Online".
Change the location of the module or cables.
4 TROUBLESHOOTING
101
4.1 Checking with LED
4