Besides the standard CPUs with graduated levels of performance, fail-safe versions are also available for the ET 200pro:

Fail-safe CPUs

• IM 154-8F PN/DP CPU and IM 154-8FX PN/DP CPU:
  for fail-safe applications with medium requirements regarding the program scope and processing speed, for distributed setup via PROFINET IO or PROFIBUS DP.
• CPU 1516pro F-2 PN:
  for fail-safe applications with high requirements on the program scope, processing speed and networking, for distributed setup via PROFINET IO RT/IRT. The additional integrated PROFINET IO interface with separate IP address can be used, for example, for network separation.