# Difference between NN weights/inputs/outputs from [0,1] and [-1,1]?

Here I see NN inputs and outputs represented by a real number between 0 and 1. Yet, elsewhere inputs are given between -1 and 1. I presume 0 or -1 acts like "inhibitory" and 1 acts like "excitatory". In which cases should I use one over the other? And does it make sense for some weights to be in one range and some in another?