Which Siemens industrial control systems did Stuxnet target?

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cyberwar U.S. Air Force personnel updating antivirus software for protection against cyberspace hackers, Barksdale Air Force Base, Louisiana, 2010.

Stuxnet was a highly sophisticated computer worm specifically designed to target Siemens AG supervisory control and data acquisition (SCADA) systems.1

Rather than targeting all Siemens systems, the malware was engineered to affect only those SCADA systems operating in conjunction with specific frequency-converter drives—devices used to control the speed of industrial motors. Furthermore, the worm was programmed to trigger malfunctions only when these drives were manufactured by specific companies in Finland and Iran and configured to run motors at precise, high speeds. This highly selective targeting strongly indicated that the cyberattack was intended to sabotage nuclear installations in Iran, such as the uranium-enrichment facility at Natanz.1