Redundancy Base Backplane LB9022BP22320.0.E, Suitable components, LB (Zone 2, Class I/Div. 2), Backplane for LB-System, For MODBUS TCP/IP, Max. 22 slots for I/O modules, Redundancy (field bus and power supply), Mounting in Zone 2, Class I/Div.2 or in the safe area, For non-intrinsically safe or Ex ic applications, HART communication via HART-IP