Converting the "DO" instruction from S5 to S7

Hi!

I´m trying to find the instructions in S7 for replacingtheinstruction "DO". I´m not an expert in S5, all I know isthat´s a kind of indirect addressing, andI need some help please.

The instruction in Step 5 basically have the next format:

.
.
L DD 0
TDD 2
DO FW 252
L DD 0
L DD 6
DO FW 250
L DD 0
L DD 6
DO FW2 48
.
.
Some times it´s referencedto thedata block DB0, when is running, and in Step 7 it´s not possible, it show me an error.

Thank you in advanced.

Hello!

Thank you a lot. I will trying this.


See you!

Hi,

please one question, I am trying to make s5 to s7 program but I have a same problem

S5 program:

DO FW252

L PY O

S7 translates as:

T     #conv_akku1  (DWORD)

L     STW

T     #conv_stw  (WORD)

L     MB   253

SLW   3

LAR1

L     #conv_stw

T     STW

L     #conv_akku1

L     PIB [AR1,P#0.0]

I have Area length error when reading on line   L     PIB [AR1,P#0.0]

Do you have any recommendation?

Thank you!!

Simaticus

Hi Ady,

you right, it's indirect adressing. First for explanation in S5:

DO FW 252 this means that the no of dd is to be found in FW252.
L DD 0 FOR example calue in FW 252 is 16 -> L DD 16

Now in S7 there are pointer as DBD (32 bit) for example.

L #DD_no // dword-no from former prog, maybe in param
SLD 5 // sld 5 for dword, sld 4 for word, sld 3 for byte (lowest 3 bit used for bit no!!!)
T #Local_Pointer // Pointer declared in temp as dword
L DBD[Local_Pointer] // L DBD (DD_no) load DBD indirect

attention!!! in S5 the data block is structured in words, in S7 in bytes!!!!
In S5 DW0 consists of DL0 and DR0, next free DW1 of DL1 and DR1.
In S7 DBW0 consists of DBB0 and DBB 1, next free DBW2!!! of DBB2 and DBB3!!!!
If you use DBW1 it consists of DBB1 and DBB2 -> and you win lots of overwritten data!!!!

Good luck

Hello,

in my opinion you should write: 

L MW252

SLW 3 (change adress to a Byte-address)

L PIW [AR1,P#0.0]

 Hope this helps.

regards
CaOd

Dear CaOd,

Thank you! I understand your think. Still, I have the same fault. I will try to find out, somewhere else is the stuck (pointer to pointer to pointer )

Thank you!!!

Best regards