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6. If PC link protocol transmission fails

a. Main port side Ethernet Port

START
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/RECV instruction
complete?
Yes
No
Was there a response timeout?
(TermSTS = 02H)
Verify the slave Ethernet Port transmission destination
IP address.
Yes
No
Is the transmission destination IP
address set to that of the slave
Ethernet Port?
Yes
Check the status and
resolve the error. Set the Ethernet Port to run + message
transmission enabled using an
operating mode control request.
Is the station status such that
run + message transmission is
enabled?
NoYes
Verify the slave Ethernet Port message transmission
UDP port number.
Supplement:
Remember that there are separate send and
receive ports that each have their own message
transmission UDP port number.
No
Is the slave port message
transmission UDP port correct?
Yes
1.Recheck the slave port IP address and message
transmission UDP 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 slave Ethernet
Port?
Yes
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.
Is the error counter read out from
the RAS information constant (i.e.,
not being incremented)?
(Use RAS information readout to
determine this.)
No
Yes
END