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6 F 3 B 0 3 6 2
• Message transmission UDP port number
As described in chapter 1, UDP/IP is used for both computer link and PC link protocol
transmission, which are collectively referred to as message transmission. These techniques use
dedicated UDP sockets that are separate from those used by socket interface transmission.
Set the port number to a value in the range 1024 to 65535. (UNIX allocates port numbers 1
to 1023 for standard services.)
The UDP port number specified at A+4 is the UDP port number allocated for message
transmission (receive). The two port numbers following that port number are automatically
allocated for message transmission (send). If computer link protocol/PC link protocol reception
is performed directed at the message transmission UDP port number specified at A+4, the
Ethernet Port/T2N will process the received data in the order received and send the result from
one of the message transmission send ports. (See figure 4.5.)
Ethernet Port
Message transmission receive port Computer link/
(port number 2000) PC link protocol transmission
Message transmission send port 1 Computer link protocol transmission
(port number 2001)
Message transmission send port 2 PC link protocol transmission
(port number 2002)
Figure 4.5 Relationship between Message Transmission Send
and Receive Port Numbers
As mentioned in the section on socket interface transmission, UDP port numbers used for message
transmission must not duplicate UDP socket port numbers or TCP socket port numbers.
c. Status (See figure 4.3 for details on bits C, D, E and F.)
F E D C B A 9 8 7 6 5 4 3 2 1 0
B 0 0 0 0 TermSTS
B+1 Detailed information (Only valid when TermSTS = 0BH.)
d. Important items
• An error will occur if the Ethernet Port is in run mode or down mode.
Run mode - Status: Transmission error (TermSTS = 0BH)
Detailed information: Port mode error (0040H)
Down mode - Status: Module error (TermSTS = 06H)
• An error occurs if a UDP port number is set to a value outside the range 1024 to 65535.
Status: Transmission error (TermSTS = 0BH)
Detailed information: Port number error (0071H)
e. Sample program
This sample ladder program issues a parameter setup request to the channel 1 Ethernet Port.