Product Description:

The CDB02.1B-ET-EC-EC-NN-L3-L3-DA-NN-FW is a double-axis control unit in the CDB Control Units series, produced by Bosch Rexroth Indramat for modular drive systems. Acting as the command layer between higher-level PLCs and power inverters, it interprets motion instructions, monitors feedback, and distributes them to connected servo drives. Within an automated line it enables closed-loop processing, parameter storage, and fieldbus routing so that motors, encoders, and safety devices can be coordinated without adding separate controllers.

Its logic electronics run from a 24 VDC supply and draw only 23 W, minimizing cabinet power budgeting. Two differential analog inputs sample at 14 bit resolution with a 1.3 kHz bandwidth, while the current loop is quantized at 12 bit to suit high-speed torque regulation. Analog outputs are stepped in 24 mV increments, and each new value is presented after 250 µs, allowing responsive reference generation for external regulators. The DA terminal block carries 6 digital inputs, 2 configurable I/O, 6 digital outputs, 2 analog inputs, and 2 analog outputs so the unit can collect process sensors and issue discrete commands without extra interface cards.

Field communication is handled through Multi-Ethernet, so the control unit can join EtherNet/IP, PROFINET, or EtherCAT networks without hardware changes. Two encoder sockets accept 2 x Multi-Encoder interfaces; each port can source 12 V or 5 V at 500 mA for incremental or SSI transducers, matching the separate 500 mA budget for digital outputs. An additional L3 header delivers 350 mA for auxiliary loads. Motion integrity is reinforced by 2 x Safe Torque Off channels that cut drive power in milliseconds, and the internal evaluation logic can track square-wave feedback up to 1000 kHz to support high-resolution encoders on fast axes.