The SU200 is a distributed I/O unit from Siemens for MC-based substation control systems.
The SU200 Distributed I/O Unit is a decentralised field control device used in microprocessor‑based station control and monitoring systems for medium‑ and high‑voltage substations. It collects, processes, and transfers data, and handles command outputs via PROFIBUS fieldbus.
The manual covers technical data, hardware design, method of operation, installation steps, wiring, configuration with the SU200DIA software, commissioning checks, and maintenance and fault‑tracing procedures, including firmware download and diagnostics.
The SU200 serves as a decentralised field control device for data collection, preprocessing, transfer, and command output in substations and industrial plants.
Firmware can be downloaded via the serial interface provided for firmware download.
The manual includes a section (8.3) that describes checking the fieldbus link as part of the commissioning process.