S7 Pointer Help

[L D[AR2P#0.0]]

If you follow the load with

LAR1

the monitoring display on the right for AR1 will show DIX?.0 indicating the start address for this instance of the FB

 

[Rusty_K]

Ok, yeah I see it.

Is there a way to extract that value in the code to make a dynamic offset?

 

[L D[AR2P#0.0]]

Do you mean you want to write some code that loops and fills in the area ?

 

[Rusty_K]

Yeah, precisely!

 

[L D[AR2P#0.0]]

	 LAR1 P##Stat_Rob_RX_Buffer	 //point to start of buffer
	 TAR2						 //get current instance base address
	 +AR1						 //compute absolute base address
	 L	 240					 //fill 240 bytes
Loop: T	 #iCount				 //update loop count (temp variable)
	 L	 #byFillValue			 //get fill value (byte)
	 T	 B [AR1,P#0.0]			//write to buffer
	 +AR1 P#1.0					 //inc to next byte in buffer
	 L	 #iCount				 //test for end of loop
	 LOOP Loop					 //loop for all bytes