6ES7511-1AK00-0AB0 Siemens CPU 1511-1PN, 150KB Program, 1MB Data SIMATIC S7-1500, CPU 1511-1 PN, Central processing unit with Work memory 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. Product cancellation in 10/15/2015 and the upgrade Model is 6ES7511-1AK02-0AB0