Disclosed is an automation system (1) for executing safety-relevant automation functions. Said automation system (1) comprises one or several control componentries (10) and one or several input/output componentries (30, 30′,50) that are connected thereto. The control componentry (10) is provided with standard program parts (11, 12) and fail-safe program parts (13, 14) to communicate with the connected input/output componentries (30, 30′,50) via corresponding standard bus protocols (S) and fail-safe bus protocols (F). At least one of the input-output componentries (30) is controlled by both the standard program parts (11, 12) via the communicated standard bus protocol (S) and the fail-safe program parts (13, 14) via the communicated fail-safe bus protocol (F), said fail-safe bus protocol (F) having greater priority for said input/output componentry (30) than the standard bus protocol (S).