When The Sd/Rd Led Does Not Turn On At Data Sending; When Data Cannot Be Received With The Sd/Rd Led Off; When The L Er Led Turns On - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

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.
Check item
Is the ERROR LED or ERR LED on or flashing?
Are the cables properly connected?
Is the program correct?
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 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.
Check item
Is the ERROR LED or ERR LED on or flashing?
Are the cables properly connected?
Are the parameter settings correct?
Is the program correct?
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 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.
Check item
Are the Ethernet cables used normally?
Does the cabling condition (bending radius) meet the specifications?
Is the hub used operating normally?
Is there any source of noise near the module or cables?
If the above action does not solve the problem, perform the module communication test to check for hardware failure. (
Page 284 Module communication test)
Action
Identify the error cause using the engineering tool. ( Page 282 Checking
the Module Status,  Page 286 Checking the Network Status).
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)
Check and correct the send program of the Ethernet-equipped module.
*1
Action
Identify the error cause using the engineering tool. ( Page 282 Checking
the Module Status,  Page 286 Checking the Network Status).
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)
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
Check and correct the send program of the external device.
*1
Action
• 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.
Refer to the manual for the Ethernet cable, and correct the bending radius.
• 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.
Change the location of the module or cables.
3 TROUBLESHOOTING
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3.1 Checking with LED
3