Omron CJ1W-ETN21 Response Codes, UDP Socket Open Request, UDP Socket Receive Request

Using Socket Services by Manipulating Dedicated Control Bits						Section 6-7
Bit		Switch	Status	Manipulated		Unit operation
				by
13	5	Close Request	ON	User	Close processing executed when switch is turned ON.
		Switch			(The protocol (TCP/UDP) is determined when the socket is
					opened.)
			OFF	Unit	Unit turns OFF switch when close processing has been com-
					pleted.

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

Response	Meaning
code
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.

UDP Socket Receive Request

Response	Meaning
code
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.

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