Product number (marketing number) 6ES7518-4AP00-0AB0 Product description SIMATIC S7-1500, CPU 1518-4 PN/DP, central processing unit with work memory 6 MB for program and 60 MByte for data, 1st interface: PROFINET IRT with 2-port switch, 2nd interface: PROFINET RT, 3rd interface: Ethernet, 4th interface: PROFIBUS, 1 ns bit performance, SIMATIC memory card required