Siemens S7 pointer +stl question

program :
L #measurement
+ -1
SLD 4
LAR1
AUF "DB72"
L DBW [ar1,P#4.0]

question1 :
measurment =5
5-1=4
0000 0000 0000 1000
SLD 4 gives
0000 0000 1000 0000

no if it was [ar1,P#0.0] i figured out before that it was
0000 0000 1000 0|000 so i had to look at DBW8 but now it says P#4 ?
I just have to add 8 and 4 and look at DBW 12 ?

question 2 :
on another place they use L DBD [...]
where does DBD stand for ?

p#x.y - love 'em

question 1.
4 is ...00100 not ...01000

SLD 4 is strange. SLD 3 removes the 'bit' part of the pointer.

Anyway SLD 4 gives ...001000000 (pointing at address 8 - ignore bits 0,1 and 2)

The P#4.0 offsets this by 4 pointing to address 12.

question 2.
DBD is Data Block Double word.

Hope this helps

p#x.y - love 'em

question 1.
4 is ...00100 not ...01000

SLD 4 is strange. SLD 3 removes the 'bit' part of the pointer.

Anyway SLD 4 gives ...001000000 (pointing at address 8 - ignore bits 0,1 and 2)

The P#4.0 offsets this by 4 pointing to address 12.

question 2.
DBD is Data Block Double word.

Hope this helps

ok problem solved
thanx ! DBD data double word : strang i couldn't find this in te help files