When you say the coefficient, do you mean the slope? If so that is not restricted to be between 0 and 1 or any value. It simply shows the change in the logit for a one unit change in the independent variable. It is only the dependent variable that has to have only two values (and they don't have to be 0 and 1, that is just common to code them that way. Either way they are not a range between 0 and 1 - they are just two specific values you coded).