Siemens SIMATIC S7 System Manual page 459

There are two AS-i operational modes:
● Protection mode:
● Configuration mode:
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
– You cannot change AS-i slave device and CPU I/O addresses.
– The green "CM" LED is OFF.
– You can make required changes in your AS-i slave device and CPU I/O addresses.
– The green "CM" LED is ON.
103BCommunication
10.4 AS-i
459