The AC 800M HI offers a SIL3 TÜV certified control environment for combining safety and business critical process control in one controller without sacrificing safety integrity. When configured as a SIL1-2 system, the AC800M HI is realized in a 1oo1D structure by combining application execution in the PM865 with diagnostic and monitoring functions in the SM811/SM810. When configured as a SIL3 system, the AC800M HI is realized in a 1oo2D structure by executing application in both PM865 and SM811.

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