Connections cannot be opened either if you attempt Accept from one socket to another socket
which is open with Accept.
Furthermore, you cannot use more than one Connect from another node to open multiple connec-
tions to a single TCP socket which is open with Accept on the build-in EtherNet/IP port.
•
You can use the keep-alive function for TCP sockets at the built-in EtherNet/IP port.
The keep alive function checks whether a connection is normally established when no data is sent
or received for a certain period on the communications line where the connection was established.
The built-in EtherNet/IP port responds to checks from other nodes even if keep alive is not specified.
• For TCP sockets, the send data is resent up to 12 times if an acknowledgment (ACK) from the re-
mote node is not received. The resend interval increases every resend in a range from one second
to 64 seconds.
• For TCP sockets, a connection request (SYN) is sent by performing an open connection. SYN is re-
sent up to four times if an acknowledgment (SYN + ACK) from the remote node is not received. An
error will occur if SYN + ACK is not received yet even after 75 seconds has elapsed since the open
processing.
9 Socket Service
9-30
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
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