The Siemens 6AG1592-6EF00-2AA0 is a pack of five E-Coding Elements Type F for ET 200MP F-modules (F-DI, F-DQ). These are the mechanical coding keys that prevent inserting the wrong module type into a base unit — a small but critical part for maintaining safe isolation and avoiding wiring errors. This SIPLUS variant is the ruggedized version with conformal coating, rated for -25 to +60 °C, and designed for environments where standard electronics would fail from condensation, oil mist, or corrosive gases.
What they fit and where they go
These coding elements drop into the base units listed: 6AG1526-* and 6AG2526-*. That covers the SIPLUS versions of the ET 200MP active and passive base units for fail-safe modules. If your BOM calls for those base units, this pack gives you five keys — enough for a small cabinet or a spare bag. The elements themselves are non-electrical; they physically encode the module type so a standard I/O module cannot be seated in a fail-safe slot and vice versa.