excel solver binary variables

Hi guys

I am having a problem in getting excel solver to solve a linear programming problem.
Suppose i have binary variables as follows:
0 1 1 0 1 0 1
I want to track the change between each variable. eg if there's a change of value from one variable to the next then i want to times it by 15 ie (x2-x1)*15.
The problem is i want a positive 15 not negative 15 in some cases.
I tried using absolute value function but it's not linear so i cant use solver with simplex method to solve it.

Note: I can only use solver simplex method to solve this.
The above problem is an extract of a bigger problem with more constraints in solver.

If you have any more questions feel free to ask.

Thanks

Originally Posted by Richard Buttrey

Hi,

is it an option to square the difference and then take a square root at a later stage?

Regards

Tried that and it does not work since it's not linear
Any other suggestions?