Mitsubishi Electric MELSEC iQ-R02CPU - When Data Cannot be Received with the SD;RD LED off; When the L er LED Turns on; When the SD;RD LED Does Not Turn on at Data Sending

3 TROUBLESHOOTING
3.1 Checking with LED
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3
When the SD/RD LED does not turn on at data sending
When the SD/RD LED does not turn on at data sending, check the following items.
If the above action does not solve the problem, perform the module communication test to check for hardware failure. (
Page 284 Module communication test)
*1
*1 The module communication test cannot be performed for the CPU module (built-in Ethernet port part). Perform the troubleshooting of
the CPU module and check for hardware failure. ( MELSEC iQ-R CPU Module User's Manual (Startup))
When data cannot be received with the SD/RD LED off
When data cannot be received with the SD/RD LED off, check the following.
If the above action does not solve the problem, perform the module communication test to check for hardware failure. (
Page 284 Module communication test)
*1
*1 The module communication test cannot be performed for the CPU module (built-in Ethernet port part). Perform the troubleshooting of
the CPU module and check for hardware failure. ( MELSEC iQ-R CPU Module User's Manual (Startup))
When the L ER LED turns on
When the L ER LED turns on, check the following.
If the above action does not solve the problem, perform the module communication test to check for hardware failure. (
Page 284 Module communication test)
Check item Action
Is the ERROR LED or ERR LED on or flashing? Identify the error cause using the engineering tool. ( Page 282 Checking
the Module Status,  Page 286 Checking the Network Status).
Are the cables properly connected? Correct the cable properly.
Perform the following tests to check for the status of the cable connection and
line.
• PING test ( Page 291 PING Test)
• Communication status test ( Page 292 Communication Status Test)
Is the program correct? Check and correct the send program of the Ethernet-equipped module.
Check item Action
Is the ERROR LED or ERR LED on or flashing? Identify the error cause using the engineering tool. ( Page 282 Checking
the Module Status,  Page 286 Checking the Network Status).
Are the cables properly connected? Correct the cable properly.
Perform the following tests to check for the status of the cable connection and
line.
• PING test ( Page 291 PING Test)
• Communication status test ( Page 292 Communication Status Test)
Are the parameter settings correct? Check the module parameters of the Ethernet-equipped module. Correct the
value for the following setting if it is wrongly set.
• "IP Address" under "Own Node Settings" of "Basic Settings"
• "Gateway Parameter Settings" of "Application Settings"
Page 241 PARAMETER SETTINGS
Is the program correct? Check and correct the send program of the external device.
Check item Action
Are the Ethernet cables used normally? • Check if the Ethernet cable which conforms the standard is used. (
MELSEC iQ-R Ethernet/CC-Link IE User's Manual (Startup))
• Check if the station-to-station distance is set within range. ( MELSEC
iQ-R Ethernet/CC-Link IE User's Manual (Startup))
• Check if the Ethernet cables are not disconnected.
Does the cabling condition (bending radius) meet the specifications? Refer to the manual for the Ethernet cable, and correct the bending radius.
Is the hub used operating normally? • Check if the hub which conforms the standard is used. ( MELSEC iQ-R
Ethernet/CC-Link IE User's Manual (Startup))
• Power off and on the hub.
Is there any source of noise near the module or cables? Change the location of the module or cables.