160

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