comparation

hello

guys how i can compare between two number in step7 graph

Hello looktook,

can you tell us why do you want compare 2 numbers in graph?

One way is

• compare 2 numbers in a FC
• the result is in a variable, maybe == or > or...
• use this variable in a transition at graph

Hope this helps.

regards
CaOd

thank u so much for ur answer

well i want programme robot using graphcet and i want controle the position of that robot using compartion between where he was and were iwant take him , i have position of the position were he is (x1,z1) and where i take him position  (x3,z3) , sometime the postion were iwant take him can be in left i need to make engine work in sens and when he is in the right i need make the engine work in another sens , so i need to comapre the both position , below is my grafcet

sorry for my english

Hello looktook,

your grafcet looks fine for the comparation..

The comparation should you programming in a extra FC.
I would do this e.g. with AWL or FUP. 

//example in AWL
L "X1" //load variable "X1" - position 1
L "X2" //load variable "X2" - position 2
==I // compare the variables "X1" and "X2"
    //if your values are Integer otherwise ==D for Double-Integer or ==R for Real
= "X1_X2_Equal" //result is a Boolean

Then you have a boolean variable which you can use at the transition in your grafcet (or graph).
The overview of your program is easier.

regards
CaOd

Thank u

well i just made my grafcet with comparation position and i had make sumilation and it work very good , [snip]

Thank u

New question published by looktook is split to a separate thread with the subject How can make liason between grafcet and excel?.

Best regards
Jen_Moderator