Omron NX-series User Manual page 151

Observation
Reading or writing data
is not possible.
No error response is re-
turned by the Communi-
cation Control Unit.
An unexpected frame
size restriction violation
occurred during usage
of the TCP/UDP mes-
sage service.
Cannot establish a
TCP/IP connection.
A TCP/IP connection is
lost and the client must
reconnect.
NX-series Communication Control Unit Built-in Function User's Manual (Z396)
General status
--- The frame length is
smaller than the mini-
mum frame length of
12 bytes.
--- The data field size
value does not match
the actual transmitted
number of bytes.
--- Unstable network
communications.
--- The TCP/UDP mes-
sage service has not
been enabled in the
Communication Con-
trol Unit.
--- The frame is sent to a
Communication Con-
trol Unit with an incor-
rect port number set-
ting
--- The MTU/maximum
datagram size is less
than the required
frame length.
Standard TCP error A total of 32 active
TCP clients are al-
ready connected with
the Communication
Control Unit.
The TCP/UDP mes-
sage service function
is not enabled in the
Communication Con-
trol Unit.
The TCP/IP connec-
tion was idle for more
than 30 seconds and
a 9th client attempted
a connection. In this
condition, an idle ac-
tive client will be au-
tomatically closed.
9 TCP/UDP Message Service Function
Causes Corrective action
Check the size of the frame is with-
in specifications.
Check the size of the frame is the
same as the specified number of
bytes in the data field.
Check network connections and
other sources of interference.
Check the TCP/UDP message
service setting is enabled. Refer to
A-1 Sysmac Studio Settings for the
Built-in EtherNet/IP Port on page
A - 2 for details.
Check the port number settings.
Refer to TCP/IP and UDP/IP Port
Number Setting on page 9 - 6 for
details.
Specify the maximum frame size is
the same or less than the maxi-
mum allowed datagram size on the
client.
To establish new TCP/IP connec-
tion, make sure that the number of
active units connected will be less
than 32.
The TCP/UDP message service
function is disabled.
Enable the TCP/UDP message
service function in the TCP/UDP
Message Service Settings Dis-
play. Refer to A-1-7 TCP/UDP
Message Service Settings Dis-
play on page A - 13 for details.
Specify the idle state to less than
30 seconds and keep the client
connection active at all times.
9
9 - 7