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The CPU 414-4H is compatible with the SIMATIC S7-400H and S7-400F/FH. It allows a fault-tolerant S7-400H system to be configured. It can also be used for the failsafe S7-400F/FH automation system in conjunction with an F-runtime license. The integrated PROFIBUS DP interface supports direct connection to the PROFIBUS DP fieldbus as master.