Numerous CPUs with differing performance ranges are available for SIMATIC S7-400:

• CPU 412-1, CPU 412-2 und CPU 412-2 PN:
  For smaller plants in the mid-performance range.
• CPU 414-2, CPU 414-3, CPU 414-3 PN/DP:
  For medium-sized plants with additional requirements for program scope, processing speed, and communication.
• CPU 416-2, CPU 416-3, CPU 416-3 PN/DP:
  For plants with high requirements in the top-end performance range.
• CPU 417-4 DP:
  For plants with the most stringent requirements in the top-end performance range.
• CPU 412-5H, CPU 414-5H, CPU 416‑5H and CPU 417-4H:
  For SIMATIC S7-400H and S7-400F/FH.
• CPU 414F-3 PN/DP, CPU 416F-2 and CPU 416F-3 PN/DP:
  For constructing a fail-safe automation system for plants with increased safety requirements.