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Using Socket Services by Manipulating Dedicated Control Bits Section 6-7
As shown in the above table, the Request Switches are turned OFF by the
Ethernet Unit when the requested processes has been completed.
Note There is also a Socket Force-close Switch in bit 2 of the first word allocated to
the Ethernet Unit in the CPU Bus Unit Area in the CIO Area. When the Socket
Force-close Switch is turned ON, all sockets that are open will be force-
closed. Refer to Section 4 Ethernet Unit Memory Allocations in the Operation
Manual, Construction of Networks for details.
When using socket services with the Socket Service Request Switches, the
ladder diagram should be programmed to check the response codes when
Socket Service Request Switches are turned OFF.
6-7-6 Response Codes
When processing of a request has been completed for socket services exe-
cuted using Socket Service Request Switches, a response code will be stored
in the Response Code word in the Socket Service Parameter Area. The fol-
lowing response codes will be stored depending on the service that was
requested.
UDP Socket Open Request
UDP Socket Receive Request
13 5 Close Request
Switch
ON User Close processing executed when switch is turned ON.
(The protocol (TCP/UDP) is determined when the socket is
opened.)
OFF Unit Unit turns OFF switch when close processing has been com-
pleted.
Bit Switch Status Manipulated
by
Unit operation
Response
code
Meaning
0000 Normal end
0105 Local IP address setting error.
0302 CPU Unit error; cannot execute.
1100 UDP socket number is not 1 to 8 or local UDP port number is 0.
110C Request Switch turned ON during other processing.
220F Specified socket is already open.
2211 Unit is busy; cannot execute.
2606 Specified socket is already open as TCP socket; cannot open UDP
socket.
2607 Specified Socket Service Parameter Area is already being used for
another socket.
003E Internal buffer cannot be obtained due to high reception traffic
(ENOBUFS).
0049 The same UDP port number has been specified more than once
(EADDRINUSE).
0081 The specified socket was closed during open processing.
Response
code
Meaning
0000 Normal end
0302 CPU Unit error; cannot execute.
1100 Number of bytes to receive is not in allowable range.
1101 The area designation of the Send/Receive Data Address is not in
allowable range.