I should also check if CS3000 is still in use or if Siemens has newer systems like SIMATIC S7 or similar that have replaced it. If it's older, the manual might be more challenging to find, so accessing it from Siemens support or through technical libraries would be mentioned.
Technical manuals are typically restricted to registered customers via the Siemens SiePortal 2. Yokogawa CENTUM CS 3000 (Distributed Control System) While manufactured by siemens cs3000 manual