Copy Any I/O to DB Siemens S7

Hello, How can i copy an I/O area from ex profibus/profinet to My FB instance DB via a spcified number. I want to have an input pin on the block where i can just typ start adress on tha I/O!!?!

Some help would be really nice../

No one ?

Usually LD will take care of any questions pertaining to pointers. I'll try to have a go at it.

#In_Adr is an INPUT parameter to an FC or FB.
The below code should work in inputs in the process image. Not sure if it works also for inputs outside the process image (Peripherial inputs).


edit: Changed SLW 3 to SLD 3. Should not be so critical, only if the input adress is a very high one which is unlikely.

Thanx Jesper you´re always a good helper.. Im gonna test this code right away !

So the Pointer here points att the specified I/O area.. But where does it transfer the data to my local data in my instance DB.

Can i simply change this if i also want to write to I/O area

Quick and dirty would be to do like this:

L IW [AR1,P#0.0]
T #DriveInputWord1 // setup in FB declaration
L IW [AR1,P#2.0]
T #DriveInputWord2 // setup in FB declaration

edit: I think it should also be possible to build an ANY pointer and transfer the whole area between I-area and IDB-area in one go with SFC14.
But here I am not so sure how to create the ANY pointers. I could do it but it would take me some time to read up on it.
This would be a job for ANY-Pointer-man (LD !)

You can also write to outputs like this:

L #Out_Adr
SLD 3
LAR1

L #DriveOutWord1
T QW [AR1,P#0.0]

Okej

I tried this but hmm.. im not sure of the syntax

T [P#DIX 26.0 2bytes]

JesperMP said:

edit: I think it should also be possible to build an ANY pointer and transfer the whole area between I-area and IDB-area in one go with SFC14.
]

Click to expand...

If I remember correctly, the SFC14 (and 15) only works with consistent IO areas with lengths of 3, 5+ bytes.

You could dechiper an any-pointer to copy from any area using L/T instructions. It should be several examples (mainly made by LD) in the plctalk archive.

Kalle

In your Step7 help function, you'll find a description of the format of the anypointer.
And here's also some info:
http://www.plcdev.com/book/export/html/624

KalleOlsen said:

If I remember correctly, the SFC14 (and 15) only works with consistent IO areas with lengths of 3, 5+ bytes.

Click to expand...

True.
In case you just need to transfer 1,2 or 4 bytes, you just use a simple load and transfer instruction.
L IBx
T byte
L IWx
T word
L IDx
T doubleword

L byte
T QBx
L word
T QWx
L doubleword
T QDx