A sources sought notice seeks to determine if commercially available programmable controllers can fully interface with existing Siemens equipment and software for Facility Related Control Systems at Naval Station Rota, Spain. The requirement covers various controller types, including network, digital, zone, VAV, unitary, and expansion modules. The Navy is considering a class justification to continue Siemens standardization for cybersecurity purposes. No specifications or drawings will be made available, and this is not a solicitation.