Automation system and a method and input/output assembly therefore

An automation system for performing a safety-oriented automation function, said automation system comprising:

• at least one control assembly having a standard program part responsive to a standard bus protocol and a failsafe program part responsive to a failsafe bus protocol;
• at least one input/output assembly receiving control signals from the at least one control assembly, wherein control signals received using the failsafe bus protocol have a higher priority than control signals received using the standard bus protocol, said input/output assembly having an output having a redundant connection pair connected to an actuator via a corresponding pair of switches,
• wherein both switches of the redundant connection pair are released in the event of a fault transmitted via the failsafe bus protocol, transferring the actuator to a safe state, while only one switch of the redundant connection pair is released in all other situations, and
• wherein the safe state cannot be cancelled by an enable signal transmitted via the standard bus protocol.