Function BlockTcpConnectPLCopen motion icon

Description

This function block creates a new socket and performs the connect operation using default TCP settings, and a specified server address and port. You will have use the TcpClose function block to release the socket returned by TcpConnect.


  • 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, you must use the TcpIsConnected function block to know if the connection is ready.

Figure 7-211: The TcpConnect function block

Related Functions

TcpAccept, TcpBinReceive, TcpBinSend, TcpClose, TcpIsConnected, TcpIsValid, TcpListen, TcpReceive, TcpSend

Arguments

Input

Execute Description On the rising edgeClosedA 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.
  Data Type BOOL
  Range 0, 1
  Unit N/A
  Default
Address Description The IP Address of the remote server.
  Data Type STRING
  Range N/A
  Unit N/A
  Default
Port Description The network port to use.
  Data Type DINT
  Range N/A
  Unit user units
  Default

Output

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

Example

Structured Text

(* 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;