Function BlockTcpIsValidPLCopen motion icon

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 edgeClosedA 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;