Product Description:

The CML20.1-NP-120-NA-NNN-NW is a control main unit produced by Bosch Rexroth Indramat for the CML IndraControl Hardware series. Serving as the computational core of an automation rack, it executes motion, logic, and communication tasks for drives and I/O modules. The compact module integrates processor, working memory, and fieldbus circuitry so machine builders can mount a single board on DIN rail and achieve deterministic sequence control without external PCs. By concentrating computation and data exchange in one device, the unit coordinates machine cycles, supervises interlocks, and forwards status data to supervisory systems.

At the heart of the module is an STMicroelectronics ST40 CPU that runs at 192 MHz. This clock frequency supports PLC scan cycles and motion algorithms. The base and configured DRAM both provide 16 MB of volatile storage, allowing operating system code, user programs, and temporary process data to remain in high-speed memory. Non-volatile tasks such as recipe indexes or startup parameters are retained in the integrated 64 kB of NvRAM, so power loss does not erase critical settings. For plant networking, the controller features a PROFIBUS interface that enables real-time exchange with drives, decentralized I/O, and peer controllers over the widely used 12 Mbit fieldbus.

The hardware platform corresponds to CPU design variant 1, so the processing core, memory map, and peripheral set match the baseline CML layout. Thermal management is simplified because the unit operates without a fan; convection through the slim Inline housing dissipates heat during normal cycle loads. No SRAM is configured, so deterministic variables are handled directly in DRAM and NvRAM. The control belongs to series 20 within the product numbering scheme, matching the related expansion slices used with that revision of IndraControl modules.