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The S7-400 is the most powerful PLC in the family of SIMATIC controllers. It enables successful automation solutions with Totally Integrated Automation (TIA). The S7-400 is an automation platform for system solutions in production and process engineering, and it is characterized primarily by its modularity and performance reserves.

Standard CPUs
6ES7412-1XJ07-0AB0 : CPU 412-1, MPI/DP, 512KB
6ES7412-2XK07-0AB0 : CPU 412-2, MPI/DP, 1MB
6ES7412-2EK07-0AB0 : CPU 412-2 PN, 1MB, 2 SCHNITTSTELLEN
6ES7414-2XL07-0AB0 : CPU 414-2, MPI/DP, 2MB
6ES7414-3EM07-0AB0 : CPU 414-3, PN/DP, 4MB. 3 INTERFACES
6ES7414-3XM07-0AB0 : CPU 414-2, 2MB. 3 INTERFACES
6ES7416-2XP07-0AB0 : CPU 416-2, MPI, PROFIBUS, 8MB
6ES7416-3XS07-0AB0 : CPU 416-3, 16MB, 3 INTERFACE
6ES7416-3ES07-0AB0 : CPU 416-3 PN/DP, 16MB, 3 INTERFACE
6ES7417-4XT07-0AB0 : CPU 417-3, 32MB, 4 INTERFACE

Fault-tolerants
6ES7412-5HK06-0AB0 : CPU 412-5H PN/DP, 1MB F, S7-400H/F/FH
6ES7414-5HM06-0AB0 : CPU 414-5H PN/DP, 4MB F, S7-400H/F/FH
6ES7416-5HS06-0AB0 : CPU 416-5H PN/DP, 16MB F, S7-400H/F/FH
6ES7417-5HT06-0AB0 : CPU 417-5H PN/DP, 32MB F, S7-400H/F/FH