TcpIsValid

Description

This function block tests if a socket is valid.

Figure 7-222: The TcpIsValid function block

Related Functions

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

Arguments

Input

Execute	Description	On the rising edgeA rising edge is the transition of a digital signal from low to high. It is also called positive edge request to perform copying a file
	Data Type	BOOL
	Range	0, 1
	Unit	N/A
	Default	—
ID	Description	The ID of the client socket.
	Data Type	UDINT
	Range	N/A
	Unit	N/A
	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
Valid	Description	TRUE if the specified socket is still valid.
	Data Type	BOOL

Example

Structured Text

(* TcpIsValid example *)
CASE StepCounter OF
0:
   Inst_TcpIsValid(TRUE, MySocketID);
   StepCounter := StepCounter + 1;
1:
   Inst_TcpIsValid(TRUE, MySocketID);
   IF Inst_TcpIsValid.Done THEN
      MyTcpIsValid := Inst_TcpIsValid.Valid;
      Inst_TcpIsValid(FALSE, 0);
      StepCounter := StepCounter + 1;
   END_IF;
END_CASE;