6 F 3 B 0 3 6 2
c.Send request
START
Does the SEND instruction
complete?
Yes
Is the station status such that run + socket transmission is enabled?
Yes
Was a TCP connection
established?
Yes
Is the socket status
RCLOSE bit?
0
Is the socket status
NOACK bit?
0
Does the status indicate a
timeout error?
TermSTS = 0BH
Details = 0020H
Yes
No | Verify the status using the procedure described in the | |
item 3 " If a SEND or RECV instruction fails complete" | ||
| ||
| on page 148. | |
|
|
No | Set the Ethernet Port to run + socket transmission | |
| enabled using an operating mode control request. | |
No |
| |
| ||
Open UDP ports on the local and remote ports. | ||
| ||
1 |
| |
| ||
Close the socket. | ||
| ||
|
|
Status: Unopened (TermSTS = 0BH, details = 0081H)
1 | Close the socket. |
|
Status: Protocol error (TermSTS = 0BH, details = 0091H)
No
Check the status and resolve the error.
∙Requests cannot be accepted due to network congestion.
→Redesign the user program.
∙Transmission becomes impossible when the receive side user program accumulates data.
→Check the receive side processing.
Does a response come back
if a ping is issued to the
remote port?
Yes
Is the error counter read out from the RAS information constant (i.e., not being incremented)?
(Use RAS information
readout to determine this.)
Yes
END
| 1. | Recheck the remote port IP address and message |
No |
| transmission TCP port numbers. |
| 2. | Verify that there is no router on the network. |
| 3. | Check the network verification items. |
|
|
|
No | It is possible that there is an abnormality on the | |
network itself. Check the network verification | ||
| ||
| items. | |
|
|
RAS error counters: Alignment error
Short packet
CRC error
