Communications Using Data Link Instructions Cannot Be Performed; Communications Cannot Be Performed During Ops Connection In A Redundant System - Mitsubishi Electric QJ71E71-100 User Manual

16.5.14
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.
Check item
Is the communication status of the connected device
normal?
Is the number of resends set upon every instruction
execution?
Does an error occur even after the arrival monitoring time is
increased?
Does an error occur even after the setting value in "TCP
Resend Timer" in the initial setting is increased?
Are the routing parameter settings correct?
Is the Station No. <->IP information setting configured?
If the action above does not solve the problem, perform the following tests on the E71 to check for hardware error.
• Hardware test (
• Self-loopback test (
16.5.15
Communications cannot be performed during OPS
connection in a redundant system.
The following table lists how to troubleshoot the problem when an E71 cannot perform communications during OPS
connection in a redundant system.
Check item
Is "OPS connection" set under "Open system" of the open
setting?
Is the own station port number of the E71 correct?
Is the IP address of the OPS correct?
The MELSOFT connection and MC protocol cannot be used together for a connection set for the OPS connection. In
addition, a port set for the OPS connection can be connected using EZSocket only.
If the action above does not solve the problem, there may be other causes or the connected device may be in failure.
Correct the error of the connected device.
Modify the program to set the number of resends upon every instruction
execution.
Check and correct the arrival monitoring time.
Check and correct the setting value in "TCP Resend Timer".
Check the routing parameters and correct the error.
Set the "Station No.<->IP Information" setting in the network parameter
window. (
(Application))
Page 374, Appendix 6.2)
Page 373, Appendix 6.1)
Set "OPS connection" under "Open system" of the open setting.
Correct the own station port number of the E71.
Correct the IP address of the OPS.
CHAPTER 16 TROUBLESHOOTING
Action
MELSEC-Q/L Ethernet Interface Module User's Manual
Action
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