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CHAPTER 16 TROUBLESHOOTING
16
16.6 Troubleshooting by Symptom
16.6.14 Communications using data link instructions cannot be performed.
16.6.14 Communications using data link instructions cannot be
performed.
The following table lists how to troubleshoot the problem when an E71 cannot perform communications using data link
instructions.
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 communication status of the connected device
normal?
Correct the error of the connected device.
Is the number of resends set upon every instruction
execution?
Modify the program to set the number of resends upon every instruction
execution.
Does an error occur even after the arrival monitoring time is
increased?
Check and correct the arrival monitoring time.
Does an error occur even after the setting value in "TCP
Resend Timer" in the initial setting is increased?
Check and correct the setting value in "TCP Resend Timer".
Are the routing parameter settings correct? Check the routing parameters and correct the error.
Is the Station No. <->IP information setting configured?
Set the "Station No.<->IP Information" setting in the network parameter
window. ( MELSEC-Q/L Ethernet Interface Module User's Manual
(Application))
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