Base box is the main part of G series. It is basically a chassis and mount for modules. Base box:
Base boxes differ in the number of module slots and the position of mandatory module slots. You are now free to make your own configuration and reconfigure it whenever you need it. All modules are hot-swappable, i.e. you can change or replace them without the need to switch the device off (at least one Control and PSU module have to be in operation).