Mitsubishi Electric MELSEC-L Series - If the SD;RD LED Does Not Flash When Data Is Sent

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CHAPTER 16 TROUBLESHOOTING
16
16.4 Checking the LEDs 16.4.3 If the SD/RD LED does not flash when data is sent
16.4.3 If the SD/RD LED does not flash when data is sent
The following table lists the items to be checked and the actions to be taken if the SD LED does not flash when data is
sent.
If the action above does not solve the problem, perform the following tests on the E71 to check for hardware error.
• Hardware test ( Page 333, Appendix 6.2)
• Self-loopback test ( Page 332, Appendix 6.1)
Check item Action
Is the ERR. LED or COM.ERR. LED on? Remove the cause that turned on the ERR. LED or COM.ERR. LED.
Are the cables properly connected?
Check the cable connection. In addition, perform a line test to check if
there is a problem with the cable connection and the Ethernet line.
( Page 322, Appendix 5)
Are the parameter settings correct?
Correct the IP addresses of the own station and the communication
destination, router setting, and subnet mask setting.
Is the program correct? Correct the send program of the connected device.