Should read the value from DB505 at memory location 200?

Hi guys, I´m having a trouble with debugging my program.

Here is the part of the code:

OPN   DI   505
L     "F0901_MachineParameter".Filler.DetectionPosition
L     1.000000e+000
+R
L     "F0901_MachineParameter".Shiftregister.OffsetPosContPresent
+R
RND
SLD   3
T     #SR_Adress
L     DIB [#SR_Adress]

The value in the ACCU1 before rotation is 25, after is 200 (decimal).

So i should read the value from DB505 at memory location 200, right? But that's not the case here. It gets the value from some other location and I cannot find out from where.

------------------------------------------------------------------------------------------
Split from indirect addressing with pointers.

Dr.Rock

The value in the ACCU1 before rotation is 25, after is 200 (decimal).

So i should read the value from DB505 at memory location 200, right? But that's not the case here. It gets the value from some other location and I cannot find out from where.

Nope. It reads from offset/address 25.0

That is because of the format of a pointer in S7. 3 last bits are for bit offset (0-7). So, if you want to read from offset 200, you must load 200 and then shift it by 3 to get correct pointer 200.0