Siemens SIMATIC S7-1500 System Manual page 206

Maintenance
13.2 Replacement of I/O modules and front connectors
Additional electronic coding element for fail-safe modules
In as-delivered condition, a fail-safe module not only has a mechanical coding element but
also an electronic rewritable memory for the PROFIsafe address. The figure below shows
the electronic coding element:
①
Figure 13-3
206
Electronic coding element
F-module with electronic coding element (as delivered)
Automation system
System Manual, 09/2016, A5E03461182-AD