95
6 F 3 B 0 3 6 2
4. UDP close request (using the SEND instruction)
a. Function
Close the open UDP socket.
Release the (unlimited wait state) receive request and terminate the UDP socket.
b. Transfer parameters
A3100H Module designation
A+1 CMD = 0034H Command number
A+2 SportNO Socket identifier (1 to 8)
c. Status (See figure 4.3 for details on bits C, D, E and F.)
FEDCBA9876543210
BSportNO TermSTS
B+1 Detailed information (Only valid when TermSTS = 0BH.)
d. Important items
•UDP close requests are processed with the highest priority and other executing requests are
discarded, even if the object socket is executing a UDP open, send, or receive request. Other
requests during the execution of this request will be discarded.
•The next open request for the object socket can be executed as soon as the close request
completes normally.
•An error is returned if a close request is issued for a socket that is not yet opened.
Status: Transmission error (TermSTS = 0BH)
Detailed information: Unopened (0081H)
•An error is returned if a value other than 1 to 8 is specified as the socket identifier.
Status: Transmission error (TermSTS = 0BH)
Detailed information: Illegal socket identifier (0082H)
•A UDP receive request will result in an error being returned if an unlimited wait state UDP
receive request is terminated with this request.
Status: Transmission completion timeout (TermSTS = 06H)
Supplement:
The T2N sees its requests (module control and socket interface transmission) to the Ethernet
Port as being "transmission" requests. As a result, when a request is forcibly terminated and a
response is not received from the Ethernet Port, the result is a send request timeout even if the
instruction was a RECV instruction.
•If the T2N internal completion wait time limit (2 seconds) is exceeded for this request, the error
listed below is returned.
Status: Send completion timeout (TermSTS = 06H)
In this case, first verify that the Ethernet Port is not in the down state by checking the station
status, and then verify the open/closed state of the socket in the socket status.
SportNO: Socket identifier (1 to 8)
TermSTS:See tables 4.3 and 4.4.
Detail information: See table 4.5.