how to combine integers

khalil · Apr 7, 2003

hi ,

i want to combine to integers "from" two diferent places
so i can use them as a one number, for example ...

{ vw0 = 8

{ vw3 = 6

i want to combine the 8 and the 6 together
to form one integer , " 86 "

note : im using s7 2xx plc , i know that ther's an
easy way to do it but i dont know how !!!

im trying to this but its not working ,

any help will be graet , thank you in advance .

seppoalanen · Apr 7, 2003

L mw 0 ; 8
L kf+ 10;
*F ; Accu1 = 80
L mw 3 ; 6
+F
T mw ? ; 86

is this help ?

khalil · Apr 7, 2003

seppoalanen said:
L mw 0 ; 8
L kf+ 10;
*F ; Accu1 = 80
L mw 3 ; 6
+F
T mw ? ; 86

is this help ?

yes thank you , but can you explane more please ?

Steve Bailey · Apr 7, 2003

I don't have direct experience with this brand, but it sure looks to me like Seppo's approach takes the first number (8) and multiplies it by 10, then to the result (80) adds the second number (6) to get a value of 86.

khalil · Apr 7, 2003

steve ,
what im trying to do is that i have 10 push buttons
marked from 1 to 9 , i have a display unit wich i want it to
display the numbers like a calculator , the numbers 8 and 6 are only for example , but how to let the numbers get shifted to the left ,
each the operator press any button ??

thank you all for you help.

Rick Densing · Apr 7, 2003

What has been explained is the basics of our positional, base-10, numbering system. There is really no more than that.

To carry the example further.
Now we have "86" on the display and the operator presses "5"
Just multiply "86" by 10 to get 860.
Now add the 5
You have "865" on the display.
You can keep going until your diplay runs out of digits.

khalil · Apr 7, 2003

every think is ok now ,

thank you all for your help .

rsdoran · Apr 7, 2003

I am not good with the S7 so I will just attempt to explain it in the way I understand it.

In STL if your rung has an enable bit to starts this function that would be first.

LD I0.0
MUL AC1, vw0 (ACI would be 10) result can be put back in vw0 or..
ADD vwo, vw3 adds the 80 + 6

I suggest you download S7-200 manual: http://www4.ad.siemens.de/dnl/jA2MzU3AAAA_1109582/S7200N_e.pdf

I believe seppo probably has shown a better way but not being familiar enough with them I can not say.

The Instruction List is in that manual and brief explanations of ADD and multiply.

khalil · Apr 7, 2003

thank you rsdoran , the given informations was great thank
you all for your support ,

seppoalanen · Apr 7, 2003

I'm not absolute sure of S7, but attached description is for S5-135U CPU's. I have used ACCUmalators properties, so it is not necessary put temporary calculations to memory words, becourse they are still in some accu.
I hope I'm not unnecessary confusing enyone with this stuff.

khalil · Apr 7, 2003

seppo ,

i know how to do it now , all i have to do is ;

vw0 x 10 = vw5

vw5 + new number(vw3) = result

thank you seppo for your help ,

how to combine integers

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