Indirect addressing stl

robjongen · Apr 7, 2008

Hello,

Can someone help me with this one?

I have an array db1.step.step[1..32]
I am making a function in STL that give me the first bit that is 1

One I have never worked with STL so it's kind'a difficult.

I now i have to work with indirect addressing but i have no idea on how to start.

Beacause it is a function the DB hase to be selecteble. DB1 DB2 etc

I found this already in the forum

http://www.plctalk.net/qanda/showthread.php?t=7641&highlight=indirect+addressing+stl

Thanks

Rob

Bratt · Apr 7, 2008

Check out this thread
http://www.plctalk.net/qanda/showthread.php?t=35894

L D[AR2P#0.0] · Apr 7, 2008

I was just going to post the same link....

robjongen · Apr 7, 2008

Bratt said:
Check out this thread
http://www.plctalk.net/qanda/showthread.php?t=35894

Thanks this is superb!

I have used FC99

i have one question
What is the best way of lowering the output value by one bit

Thanks very mutch!!

Rob

L D[AR2P#0.0] · Apr 7, 2008

So, if DB2.DBX0.0 is set what do you want to return ?

robjongen · Apr 7, 2008

L D[AR2 said:
So, if DB2.DBX0.0 is set what do you want to return ?

At this time;
DB2.DBX0.0 = 0

Would like
DB2.DBX0.0 = -1
And no step active = -2

Thanks

Rob

L D[AR2P#0.0] · Apr 7, 2008

Code:

//Block end
End:  SAVE  
	  +	 -1
	  T	 #RET_VAL  //Return (bitnumber-1) or -2   
	  BE

robjongen · Apr 7, 2008

L D[AR2 said:
Code:

//Block end End: SAVE + -1 T #RET_VAL //Return (bitnumber-1) or -2 BE

Thanks it works like a charm!

Rob

robjongen · Apr 9, 2008

Is it possible te set a limit of the the number of byte's the function loops ?

Thanks

Rob

Bratt · Apr 9, 2008

You could use absolut adressing as in parameter
Example: P#DB2.DBX0.0 BYTE 2
Now we are only checking the first 2 bytes. If you use this function in many places or have a lot of bytes that you loop through its better to use FC45 or FC102 as they are much faster

L D[AR2P#0.0] · Apr 9, 2008

You can specify the array name within the UDT, e.g.

Code:

	  CALL  FC	99
	   iArray :="Bits".ArrayOfUDT[1].ArrayOfBools
	   RET_VAL:=MW10

robjongen · Apr 9, 2008

Bratt said:
You could use absolut adressing as in parameter
Example: P#DB2.DBX0.0 BYTE 2
Now we are only checking the first 2 bytes. If you use this function in many places or have a lot of bytes that you loop through its better to use FC45 or FC102 as they are much faster

Thanks Guys!

That worked

Rob

L D[AR2P#0.0] · Apr 9, 2008

Of course it worked, but is it what you want ?

Bratt · Apr 9, 2008

L D[AR2 said:
Of course it worked, but is it what you want ?

I agree with out i never use absolut adressing anymore and its much better to use symbolic adressing. It was just the fastest and easiest way i could think about without rewriting anything.

Indirect addressing stl

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