SIPLUS S7-1500 CPU 1511-1 PN TX RAIL -40 ... +70°C TX with 85°C for 10 min with conformal coating based on 6ES7511-1AK01-0AB0 . Central processing unit with RAM 150 KB for program and 1 MB for data, 1st interface: PROFINET IRT with 2-PORT SWITCH, 60 ns bit performance, SIMATIC Memory Card required without display