Hello,

I have some questions about how indirect addressing works in S7 1500.

From what I have understood, in this new family of PLCs, the concept of "peripheral addressing" disappears completely, now every I/O is defined inside a specific process image. My question is: are pointers working all the same? For example a code snippet like this:

L     #ADDR

SLD   3

T     #Address_IN

L PEW [ #Address_IN]

T    #Data

 that simply reads a word from an address storing it in a local variable should be simply translated in something like this:

L     #ADDR

SLD   3

T     #Address_IN

L EW [ #Address_IN]

T    #Data

 Or maybe it is better to use (performance reasons?) the new instructions PEEK and POKE:

  CALL  PEEK
         value_type:=Word
         number_type:=DInt
         area       :=16#81
         dbNumber   :=16#0
         byteOffset :=#ADDR
         Ret_Val    :=#Data

 Excuse me if this questions sound trivial, but the programming guideline is not clear enough on this topic in my opinion.

Maybe the provided links may help: [LINK]

..of which
https://support.industry.siemens.com/cs/ww/en/view/59623719
may be most helpful.

Also - Working with arrays and moving information between same structures have been drastically improved on the S7-1x00. You may want to dig into that as possibilities.

w

New question published by Yogeshchandgude is split to a separate thread with the subject S7-1500 and cu320 - Standard block for indirect addressing for servo drive .

Best regards
Jen_Moderator