Siemens SIMATIC ET 200S Installation And Operating Manual page 43

Channel-specific diagnostics
As with the ET 200S, there are three bytes available for channel-related diagnostics starting
at byte 35 for each F-module. A maximum of 9 channel-related diagnostic messages are
possible per station. Channel-specific diagnostics for fail-safe modules are configured as
follows:
Figure 5-1
Note
In byte 35, bit 0 to 5, the module slot is encoded. The following applies:
displayed number +1 = module slot
(0 = slot 1; 1 = slot 2, etc.)
ET 200S Distributed I/O System - Fail-Safe Modules
Hardware Installation and Operating Manual, 07/2005, A5E00103686-04
Figure-Configuration of Channel-Specific Diagnostics
Diagnostics
5.2 Fault Diagnostics
5-5