FB_TermCoeRead_TcPfw()

A function block of this type is used by FB_TempCtrlCallback_TcPfw for read access to EL terminals.

Syntax

VAR_INPUT    
     Execute      : BOOL;
    TermType      : E_TcPfw_TerminalType:=eTcPfwTermT_NoTerminal;
    Pdata         : POINTER TO BYTE:=0;
    ByteCount     : BYTE:=0;
    Index         : WORD:=0;
    Subindex      : BYTE:=0;
END_VAR
VAR_IN_OUT
    TempIn        : ST_TcPfw_TempCtrlInput;
END_VAR
VAR_OUTPUT
    Busy          : BOOL:=FALSE;
    Done          : BOOL:=FALSE;
    CommandAborted: BOOL:=FALSE;
    Error         : BOOL:=FALSE;
    ErrorID       : UDINT:=0;
END_VAR

Inputs

Name	Type	Description
Execute	BOOL	A rising edge starts the process. A falling edge clears all outputs.
TermType	E_TcPfw_TerminalType	The coded type of the addressed terminal.
Pdata	POINTER TO BYTE	The destination address for the read data.
ByteCount	BYTE	The size of the data to be read in bytes.
Index	WORD	The CoE address according to the object directory of the terminal.
Subindex	BYTE	The CoE address according to the object directory of the terminal.

Inputs/outputs

Name	Type	Description
TempIn	ST_TcPfw_TempCtrlInput	The input process image of the terminal.

Outputs

Name	Type	Description
Busy	BOOL	The ongoing activity of the function block is signaled here.
Done	BOOL	The successful completion of the operation is reported here.
CommandAborted	BOOL	A TRUE indicates here that the process was aborted.
Error	BOOL	A TRUE indicates here the occurrence of a problem.
ErrorID	UDINT	In the event of an error, coded information is provided here.

Behavior of the function block:

A rising edge at Execute causes the function block to perform a series of checks.

The subindex must be in the range 0 to 127 (inclusive).
ByteCount must be greater than 0.
Pdata must not be 0.
TermType must identify an EL terminal. Only these support the CoE communication mechanism used here.

If one of the above conditions is not met, an error is reported. Otherwise, the access is transmitted to the terminal. The result of the transmission is provided at the outputs.

	In addition to the above-mentioned error possibilities, problems can occur during transmission. Furthermore, the terminal can report a problem (addressing, values, access type).

	A CoE access requires that ST_TcPfw_TempCtrlInput.EL_AdsAddr is linked.