AG_SEND or AG_RECV with SCL

[RollingPin]

I am using SCL for a bit of TCP programming on an S7-400. How do I link the DB to the AG_SEND or AG_RECV FC? In the case of FBD or ST, you use
P#DB1.DBX0.0 BYTE 4 at the RECV parameter.
I tried a similar syntax in SCL (see below)

AG_RECV(ID := 1, LADDR := W#16#1FFB, RECV := P#DB4.DX0.0 BYTE 10,
NDR => TempBool, ERROR => TempBool, STATUS => TempWord, LEN => TempInt);

The compiler throws an error "Illegal data type for constants". Anybody knows the correct syntax?

 

[L D[AR2P#0.0]]

Use View AT and contruct the anypointer as follows:

VAR_TEMP
  iMotorIndex:INT;
  iData:INT;
  Area:ANY;
  
View AT Area:STRUCT
	ID:BYTE;
	TYP:BYTE;
	NUM:INT;
	DBN:INT;
	PTR:DWORD;
	END_STRUCT;
END_VAR
View.ID:=16#10;
View.TYP:=16#02;
View.NUM:=10;
View.DBN:=4;
View.PTR:=16#84000000;
AG_RECV(ID := 1
		,LADDR := mw902
		,RECV :=  Area
		,NDR :=  M0.0
		,ERROR :=  M0.1
		,STATUS :=  mw900
		,LEN :=  iData
		);

 

[RollingPin]

Hi L D[AR2,P#0.0],
From the looks of what you have written, the 'Area' variable is a pointer to a DB. Do the individual components of this variable have specific documented significance? Where do I find this information?
I can guess that NUM is the number of bytes and DBN is the DB number. Now what do the ID, TYP and PTR mean?
Thanks.

 

[L D[AR2P#0.0]]

Here's a link to a post showing the format of an any pointer. All should become clear.

http://www.plctalk.net/qanda/showpost.php?p=164892&postcount=11

 

[RollingPin]

OK. I get it.
Why couldn't the FC just accept symbolic addressing? Wouldn't that have been much easier?

 

[L D[AR2P#0.0]]

You mean like this ?

DATA_BLOCK DB111
STRUCT
RxBuffer:ARRAY[1..10] OF BYTE;
END_STRUCT
BEGIN
END_DATA_BLOCK
FUNCTION FC111: INT
VAR_INPUT
bInput1:BOOL; //Comment for input 1	
END_VAR
VAR_TEMP
iMotorIndex:INT;
iData:INT; 
END_VAR
 
AG_RECV(ID := 1
		,LADDR := mw902
		,RECV := Db111.RxBuffer
		,NDR := M0.0
		,ERROR := M0.1
		,STATUS := mw900
		,LEN := iData
		); 
 
FC111:=0;
END_FUNCTION