Product Description:

The CML20.1-NP-120-NA is a control main unit produced by Bosch Rexroth Indramat for the CML IndraControl Hardware series. Installed in machine controllers, it supplies CPU resources, fieldbus communication, and both volatile and non-volatile memory for coordinated machine operation. This lets the controller handle motion, logic, and HMI tasks in real time while keeping control data available to connected modules. The unit is intended for cabinet-based automation systems that need centralized processing and stable communication with peripheral devices.

A clock frequency of 192 MHz drives the onboard STMicroelectronics ST40 processor, giving the unit deterministic cycle times for PLC instruction execution and motion interpolation during continuous operation. The module carries 16 MB of DRAM as working memory, and user programs, process values, and data tables run from this space during normal operation. For retained variables and system logs, it offers 64 kB of NvRAM, which preserves critical data through power interruptions without requiring a battery. Network integration is handled by a dedicated PROFIBUS interface so the controller can exchange I/O images with drives, remote I/O racks, and operator panels across the plant bus. These memory and communication resources are integrated with the backplane, supporting predictable transfer behavior between the CPU and connected modules.

In the physical layout, the housing uses an Inline form factor that slides onto a rail and helps minimize cabinet depth. Cooling demands are low enough that the unit operates without a fan, which helps limit the entry of dust that can accompany forced airflow. The CPU design variant is 1, indicating the pinout used by compatible expansion modules. The numerical identifier 20 groups this CPU with other CML20 hardware and related accessories. Because no SRAM is configured, the available bus slots can be used for fieldbus gateways or additional memory cards.