CEM3 Backplanes include a dipswitch field which is set in the factory during the manufacturing process of the Sensor3 rack. There is a Dip Switch Map permanently attached on the underside of the CEM3 processor for easy reference.
Several items are determined by the dipswitch settings on the backplane:
System voltage: 120V or 230/240V
Rack Size: 6, 12, 24, 36, or 48 (numbers of modules)
Is the rack advanced features ready? Yes/No
After setting up the switches on the backplane move on to quick rack setup and patching to complete the setup.