2 Installation2.6 Potential Relationship between the ComponentsGateway XN-312-GW-CAN 06/16 MN050003-EN www.eaton.eu 332.6 Potential Relationship between the ComponentsThe entire XN300 system operates with a common supply voltage. All XN300slice modules feature a contact point on the back that is used to establish afunctional earth connection to the DIN-rail. Moreover, the protective earthand the functional earth have the same potential in XN300 systems. Finally,the CANopen field bus and the XN300 system are galvanically isolated fromeach other.Common• 0V• Figure 20: Functional diagram of XN300 systemV+0 VV+0 VXN-312CPU systemXN-322 XN-322system busmasterU POWX3DCDC (24 V DC)n = ≦ 31n = 1U BP_24V +24 V DCU BP_5V +5 V DCGNDGNDXN300-AssistinterfaceCANCAN interface