Do pay for third-party “manuals.” Siemens provides all documentation free of charge:
For advanced applications, you need the function manuals that describe how the CU320 controls drives: sinamics cu320 manual pdf
The physical CU320 comes in two variants. Each has a separate hardware manual: Do pay for third-party “manuals
The (Control Unit 320) is a central intelligence module for Siemens SINAMICS S120 drive systems. It performs closed-loop control for motors (servo, vector, or induction) and manages communication with higher-level automation systems (e.g., SIMATIC S7 PLCs via PROFIBUS or PROFINET). The “CU320 manual PDF” is not a single document
The “CU320 manual PDF” is not a single document. Instead, it refers to a suite of official Siemens manuals depending on your firmware version and application. Below is a breakdown of the correct documentation.
Correct setup is vital for safe operation. The manual emphasizes that only qualified personnel should perform these tasks. sinamics - Siemens Support