The SIMATIC ET 200SP distributed I/O system is a scalable and highly flexible, distributed I/O system for connecting process signals to a central controller via PROFINET.

The SIMATIC ET 200SP is installed on a mounting rail and generally comprises:
* an interface module, which communicates with all of the controllers that behave according to the PROFINET standard IEC 61158,
* up to 64 I/O modules, which are plugged into passive base units in any combination
* a server module, which completes the structure of the SIMATIC ET 200SP.