Product Description:

The CDB01.1C-S3-ENS-EN2-NNN-NNN-NN-S-NN-FW is a modular drive control unit produced by Bosch Rexroth Indramat within the CDB Control Units series. It installs on Rexroth power sections to coordinate two servo axes and exchanges real-time motion data with higher-level PLCs through SERCOS III networking. In machine tools, packaging lines, and material-handling stations, the unit closes the current, velocity, and position loops for each axis so the connected motors follow commanded profiles with consistent accuracy.

This control section executes current regulation every 125 µs, while the minimum cyclic telegram on the SERCOS bus is limited to 1000 µs, which sets how quickly torque commands can be refreshed. Switching devices inside the controller accept gate signals up to 8 kHz, giving flexibility when pairing with drives that use higher PWM carrier frequencies. Field wiring provides one differential analog input and two analog outputs, and each output has a resolution of 19.5 mV per increment, enabling fine reference generation for external actuators. Digital outputs can source up to 500 mA, which is enough to drive indicator relays or optocoupler stages without intermediate amplification. The hardware natively supports two motion axes, aligns encoder data from 12-bit read heads, and maintains deterministic traffic on the SERCOS III ring.

A typical line energization produces an inrush of 6 A, after which the internal 24 V supply can deliver 1.1 A to sensors and switches. Two independent encoder ports feed the target shafts with regulated supplies of 12 V and 5 V, which helps prevent cross-loading between feedback devices. For discrete control tasks, an onboard relay contact is rated at 24 V DC at 1 A, and pulse commands can be stretched up to 60 ms for pneumatic valves that need longer activation windows. Safety functions are not integrated, so external circuitry must handle emergency stops and gate faults.