Automation system and method for operating automation system

The invention relates to an automation system comprising at least one control device (10), a system bus (12), and at least one first field device (31) and a second field device (32), the control device (10) having a system bus interface (21) for communicating with the field devices (31, 32) via the system bus (12), the field devices (31, 32) each having a data interface (41) for communicating via the system bus (12), the field devices (31, 32) each have a monitoring input (45) for receiving a monitoring signal and a monitoring output (46) for outputting a monitoring signal, the monitoring input (45) of the first field device (31) being connected via the system bus (12) to the monitoring output (46) of the second field device (32), the monitoring input (45) of the second field device (32) is connected to the monitoring output (46) of the first field device (31) via the system bus (12). The invention also relates to a method for operating an automation system according to the invention. 本发明涉及一种自动化系统，其包括：至少一个控制设