Pointer as Input variable in STL

Hello,

I am trying to implement a function with the following input parameters:

- numOut : Int

- outPtr : Pointer

The goal of this function is to set <numOut> outputs starting in the address <outPtr>.

For example, if outPtr = P#1.6 and numOut = 3 I would like to set Q1.6, Q1.7 and Q2.0.

The main problem that I have is that I don't know how to copy the value of <outPtr> into AR1.

The function that I am using is called "Activate Outputs". Within this function I am doing something like this in order to set the outputs (simplified):

L     P##outPtr  // Load the pointer to ACCU1 (I believe this is wrong)

LAR1  // Copy ACCU1 to AR1

SET

=     Q [AR1,P#0.0]  // Set the output Q1.6

I call the function inserting the following parameters:

CALL  "Activate Outputs"

numOut:=3

myaddr:=P#1.6

Does anyone have any idea about how to correct this?

 If you plan to use FC, you need to consider more points in your mind before implementing your ideas.But a rough solution is available here:

I hope it helps,

hdhosseini

Why are you setting an offset of P#2.0 to P##st_address?

Thislinkcontains a conversation where this is being explained but I don't understand it.

 2 first bytes are not relevant to your application.Please consult the online manual of STEP 7 (as shown in attachment) for more information and clues.

Best regards,

hdhosseini

Thank you for your answer, I think that now I understand the reason of the line:

L D [AR1, P#2.0]

I found the chapter A.3.4.2 of themanualvery helpful to understand the format of the type POINTER (see the image attached).

First two bytes the type POINTER are use for the number of the DB. In our case we don't use a DB so it might be 0. Therefore, we shall add an offset of 2 bytes to AR1 in order to get address and the 'D' is to indicate that we want to take 4 Bytes (Double Word).

 You are right.Pointer type is 6 byte in general.In your example , we want to skip the 1st 2 bytes that is the DB number.It is not applicable to your case.P#1.6 is stored in the next 4 bytes that is Dword access.

I  am happy it hepls you to explore something  in manual ,search the forum and share your thoughts.This is the primary goal of SIOS Forum.