Toshiba V Series User Manual page 218

Chapter 8 Error Handling
8
198
(7) When Transmission Using TCP Sockets Fails
When troubleshooting TCP sockets, also refer to the "TCP Socket Notes" section.
(a) Open request
Start
Is the URCV_T
instruction completed ?
Yes
A timeout occurred ?
Error status --- 2848
Yes
①
Is the program
attempting to issue an active
open to a socket in the passive
open state ?
Yes
Are the remote node
IP address and UDP port
number correct ?
Yes
Does a response come
back if a PING is issued to the
remote station ?
Yes
Is the error counter
read out from the RAS information
constant ?
Yes
End
No
Is the waiting time set
to unlimited ?
Yes
①
No Is the station status
such that run + socket
transmission is
enabled ?
Yes
Refer to the completion status
and eliminate the cause of the
error.
Decide which role each socket will
No
play when establishing a connection
between a pair of sockets.
No Verify the remote node IP address
and UDP port number.
1) Check the slave station IP address
and message transmission UDP
port number again.
No
2) Configure the router if there is a
router on the transmission line.
3) Check the network verification
items.
It is possible that there is an error on
No
the network itself. Check the network
verification items.
RAS error counters: Alignment error
Short packet, CRC error
No
Confirm the status when the
USEND_T or URCV_T is not
completed.
Set the station to run + socket
No
transmission enabled using an
operating mode control request.
Ethernet module User's Manual