Socket Communication Function - Mitsubishi Electric Q26UD(E)HCPU User Manual

15.3.5

Socket communication function

For the details on the socket communication function, refer to the following.
QnUCPU User's Manual (Communication via Built-in Ethernet Port)
(1) The connected device cannot receive data
If data is not delivered to the target device, check the following items.
The connection has not been opened yet.
(Check the corresponding bit in SD1282.)
An error is detected in Ethernet diagnostics.
A parameter or a setting data for SOCOPEN is incorrect.
The SOCSND instruction is not executed. (Check the start
contact and error completion device.)
The connected device has an error.
(2) Data cannot be received
If the CPU cannot receive data from the connected device, check the following items.
The connection has not been opened yet.
(Check the corresponding bit in SD1282.)
An error is detected in Ethernet diagnostics.
A parameter or a setting data for SOCOPEN is incorrect.
The SOCRCV instruction was not executed. (Check the start
contact and error completion device.)
The connected device has an error.
(3) The open processing is not completed
If the open processing is not completed, check the following items.
(a) Passive open
The parameter is incorrect.
The connected device has an error.
(b) Active open
An error is detected in Ethernet diagnostics.
A parameter or a setting data for SOCOPEN is incorrect.
The SOCRCV instruction was not executed.
(Check the start contact and error completion device.)
The connected device has an error.
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Check item
Check item
Check item
Check item
Corrective action
Wait until the connection is completed.
Remove the error cause.
Correct the parameter or setting data.
Correct the execution condition, or remove the error cause
that is identified by the error code in the completion status
area of the SOCSND instruction.
Correct the error of the connected device.
Corrective action
Wait until the connection is completed.
Remove the error cause.
Correct the parameter or setting data.
Correct the execution condition, or remove the error cause
that is identified by the error code in the completion status
area of the SOCOPEN instruction.
Correct the error of the connected device.
Corrective action
Correct the parameter.
Correct the error of the connected device.
Corrective action
Remove the error cause.
Correct the parameter or setting data.
Correct the execution condition, or remove the error cause
that is identified by the error code in the completion status
area of the SOCRCV instruction.
Correct the error of the connected device.