Unity Pro M software

Gday all, im a bit of a newbie to structed text so i was wondering if anyone can give me a hand. Basically i want to know what the inital 'Index_x := 500' does in this snippet of code. Its written in the Unity Pro M software.

Index_x := 500 ;

Static_fct_ar[Index_x] := 4900 ;Dyn_fct_pg1_ar[Index_x] := 3400 ;

Dyn_fct_pg2_ar[Index_x] := 5 ;Dyn_fct_pg3_ar[Index_x] := 15 ;

Dyn_fct_pg4_ar[Index_x] := 24 ;Dyn_fct_pg5_ar[Index_x] := 36 ;

Dyn_fct_pg6_ar[Index_x] := 250 ;Dyn_fct_pg7_ar[Index_x] := 7000 ;

Dyn_fct_pg10_ar[Index_x] := 66 ;


Thanks any help would be greatly apprecated.

All the lines below are referring to arrays and the index_x value is the array location. So basically on the second line the 500th element of the static_fct_ar array is being loaded with 4900

Thanks GeoffC,

So in this next piece If Mem_xbt_68 is true it writes 520 into Index_x then the next line makes Idx_presel_fil_adj equal to 520?? If its not true then 'Dyn_fct_pg10_ar' equals 66 which is loaded in the first bit code i posted?

Index_x := 500 ;

IF Mem_xbt_68 THEN Index_x := 520 ;END_IF;

Idx_presel_fil_adj := Dyn_fct_pg10_ar[Index_x] ;

RETURN;


Thanks

if Mem_xbt_68= false

Then 500th element of Dyn_fct_pg10_ar (array) is copied to Idx_presel_fil_adj

if if Mem_xbt_68= true

Then 520th element of Dyn_fct_pg10_ar-array is copied to Idx_presel_fil_adj


if you'r array (Dyn_fct_pg10_ar) starts with memory address %MW1000 then on situation 1. memory word %MW1500 is copied, on 2nd situation %MW1520 is copied.

(On Unity you can use symbolic programming (unlocated) or symbols with %M or %MW addresses (located). So you also need to look if variables have address or not)

untiy pro M array

Thanks Lare.

Makes sense to me now until i try and track the memory location. The memory address for 'Dyn_fct_pg10_ar' (ARRAY 0..4095) is %MW10

So should be looking at %MW510 and %MW530?

There is also another line which is
MOVE_INT_AREBOOL(Dyn_fct_pg10, %M102:10); (*dynamic keys ap 10*)

Once i can get my head around this part i should be ok.

Thanks

"So should be looking at %MW510 and %MW530?" Yes

On animation table you can check this with real PLC or simulator, put %MW10[500] to animation table, you should see indirectly value of %MW510 now, same for %MW10[520] = %MW530

"There is also another line which is
MOVE_INT_AREBOOL(Dyn_fct_pg10, %M102:10); (*dynamic keys ap 10*)"

You need to take look bit pattern of integer variable Dyn_fct_pg10. Move int to arebool : 10 copies then bits from integer to bit addresses %M102...%M111

so if Dyn_fct_pg10 have address %MW10

=> after int_to_arebool :10 command

%MW10:X0 => %M102
%MW10:X1 => %M103
%MW10:X2 => %M104
%MW10:X3 => %M105
%MW10:X4 => %M106
%MW10:X5 => %M107
%MW10:X6 => %M108
%MW10:X7 => %M109
%MW10:X8 => %M110
%MW10:X9 => %M111

%MW10:X10..X15 NOT COPIED


int_to_arebool : 16 copies all 16bits from integer to 16 memory bits and so on...


p.s added image of screenshot, %MW1000=index for %MW10

%MW1000=500

=> %MW10[%MW1000] <=> %MW510

Thanks for your help Lare,

I had to put the array into the animation table to see the live values, I'll put it all together now and work it out how it works.

Thanks again.