Product Description:

The CDB01.1C-S3-EN1-EN1-EN2-EN2-NN-S-NN-FW control card is produced by Bosch Rexroth Indramat as a member of the CDB Control Units series. Installed inside Rexroth drive racks, it handles axis feedback, runs drive control functions, and relays motion data to the machine PLC. By hosting multiple encoder channels and a dedicated fieldbus interface, the board acts as the supervisory element for current and velocity control of servo motors in automated production lines.

The board’s base power draw is 9 W, so cabinet power supplies can be sized with minimal overhead. During power-up, it can momentarily pull 6 A of inrush current, and this peak guides circuit breaker selection. A single analog monitor channel sources 5 V, 1 mA, allowing scope probes to observe internal variables without overloading the output stage. Command data enter the unit through the SERCOS III interface, giving deterministic Ethernet communication with update cycles in the microsecond range. Internally, the first encoder converter digitizes resolver or HSF feedback at 12-bit resolution, and a matching 12-bit converter is assigned to the secondary channel. For the first channel, the resolver carrier is filtered at 100 kHz and powered from an 8 VDC supply to maintain signal integrity across long motor cables.

The second encoder path accepts EnDat 2.1 / 1 Vpp / 5 V TTL signals, presenting a differential input resistance of 120 Ω and capturing incoming square waves up to 1000 kHz. Its sensor electronics run from a regulated 5 VDC rail and can deliver up to 350 mA for encoder excitation. Four encoder slots are populated, providing two EN1 channels and two EN2 channels for multi-feedback operation. When position-latch functions are active, the control card can accept input pulses as narrow as 60 ms, which supports synchronization with mechanical cam switches. This arrangement supports close timing between the drive, connected feedback devices, and higher-level motion sequences.