what does this mean?

[ladybird]

i have this Function from SIMATIC S7 and am trying so hard to understand what its meant to do.

network 1: Int to ASCII

L #input
L B#16#FO
AW
SRW 4
L 9
<=I
TAK
SPB goo1
+ 7
goo1: + 48
SLW 8
T #output

L #input
L B#16#F
AW
L 9
<=I
TAK
SPB goo2
+ 7
goo2: + 48
L #output
+I
T #output

Cheers

 

[RolfB]

Hi,

It convert a interger value between 0 to 255 dec
( or HEX 0 to FF ) to ASCII
If #input = 100 dec then #output = 3634 = '64',
that is the Hex value of dec 100 in ASCII

[TT]
network 1: Int to ASCII

[blue]sample #input is decimal 72 = hex 48 [/blue]

[blue]// left digit first [/blue]

L.#input..[blue]//.01001000 = 72 dec [/blue]
L.B#16#FO.[blue]//.11110000 = 240 (mask left nibble)[/blue]
AW........[blue]//.01000000 = 64[/blue]
SRW..4....[blue]//.00000100 = 4[/blue]
L....9....[blue]//.00001001 = 9 [/blue]
<=I.......[blue]//.is 4 <= 9 ? (yes RLO =1)[/blue]
TAK.......[blue]//.mov ACCU2->ACCU1= 4-> ACCU1[/blue]
SPB..goo1.[blue]//.RLO = 1 so jump[/blue]
+..7......[blue]//.if RLO=0 ( add offset +7;[/blue]
..........[blue]//.left digit becomes a character from A - F )[/blue]
[red]goo1:[/red]+ 48[blue]// add dec 48 = 48 + 4 = 52[/blue]
..........[blue]//.= HEX 34 (48 = Hex 30 = ASCII '0' )[/blue]
SLW.8.....[blue]//. mov it to the right place ( left digit )[/blue]
T.#output.[blue]//.0010001000000000 = HEX 3400[/blue]

..........[blue]//.right digit next[/blue]
L.#input..[blue]//.01001000 = 72 dec[/blue]
L.B#16#F..[blue]//.00001111 = 15 ( mask right nibble )[/blue]
AW........[blue]//.00001000 = 8[/blue]
L.9.......[blue]//.00001001 = 9[/blue]
<=I.......[blue]//.IS 8 <= 9 ? ( YES RLO = 1 )[/blue]
..........[blue]//.;this means a digit between 0 - 9[/blue]
TAK.......[blue]//.mov ACCU2 -> ACCU1 = 8 --> ACCU1[/blue]
SPB.goo2..[blue]//.RLO = 1 so jump ; else Accu1 is at least 10![/blue]
+.7.......[blue]//.this means a character between A - F ;[/blue]
..........[blue]//.so add offset for ASCII[/blue]
..........[blue]//.ie. 10 + 7 + 48 = 65 = ASCII 'A'[/blue]
[red]goo2:[/red]+ 48[blue]// add dec 48 = 48 + 8 = 56 = HEX 38[/blue]
L.#output.[blue]//.0010001000000000 = 13312 = HEX3400[/blue]
+I........[blue]//.0000000000100110 = 56 = HEX0038[/blue]
T.#output.[blue]//.0010001000100110 = 13368 = HEX3438[/blue]

and this is in ASCII '48'
[/TT]

HTH
Rolf

 

[ladybird]

Thanks a heap!

Cheers