SIMATIC S7-1500. CPU 1518-4 PN/DP MFP. central processing unit with C/C++ Runtime interface. working memory 4 MB for program and 20 MB for data. 1. interface PROFINET IRT with 2 port switch. 2. interface PROFINET RT. 3. interface Ethernet.4. interface PROFIBUS. 1 ns bit-performance. SIMATIC memory card (min. 2 GB) necessary