TcpConnect

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Function Block A function block groups an algorithm and a set of private data. It has inputs and outputs. - Creates a new socket and performs the connect operation.

Inputs

Input	Data Type	Range	Unit	Default	Description
Execute	BOOL	0, 1	N/A	No default	On the rising edge A rising edge is the transition of a digital signal from low to high. It is also called positive edge, request to connect a socket to a server.
Address	STRING	N/A	N/A	No default	The IP Address of the remote server.
Port	DINT	N/A	User units	No default	The network port to use.

Outputs

Output	Data Type	Description
Done	BOOL	If TRUE, the command completed successfully.
Error	BOOL	If TRUE, an error has occurred.
ErrorID	DINT	Indicates the error if Error output is TRUE. See the table in Search IndexFile and TCP/IP Function Block ErrorIDs.
ID	UDINT	The ID of the client socket.

Remarks

It is possible that the function returns a valid socket ID even if the connection to the server is not yet actually performed.
After calling this function, use the TcpIsConnected function block to know if the connection is ready.

Use the TcpClose function block to release the socket returned by TcpConnect.
This function block uses the default TCP settings and a specified server address and port.

Figure 6-280: TcpConnect

FBD Language Example

Not available.

FFLD Language Example

Not available.

IL Language Example

Not available.

ST Language Example

(* TcpConnect example *)
CASE StepCounter OF
0:
   Inst_TcpConnect(TRUE, '192.168.1.1', 1234);
   StepCounter := StepCounter + 1;
1:
   Inst_TcpConnect(TRUE, '192.168.1.1', 1234);
   IF Inst_TcpConnect.Done THEN
      MySocketID := Inst_TcpConnect.ID;
      Inst_TcpConnect(FALSE, '', 0);
      StepCounter := StepCounter + 1;
   END_IF;
END_CASE;