Siemens ET 200S 1SI Function Manual page 45

Bit assignment
The TSI#details variable is assigned in the same way as in a SIMATIC system.
Note
For a more detailed description, refer to the SIMATIC manual
Module, "Diagnostics" chapter.
Supplement to the ET 200S 1SI serial interface module
Function Manual, 01/2015, xxx
Alarm processing
ET 200S 1SI Serial Interface
45