Product Description:

The CDB01.1C-S3-ENS-ENS-NNN-MEM-L2-S-NN-FW is a plug-in control unit produced by Bosch Rexroth Indramat for the CDB Control Units series. It installs in a modular drive platform and governs axis behavior by processing motion feedback and exchanging data with higher-level PLCs. Within an automation cabinet, it acts as the command layer that translates encoder signals, manages safety requests, and forwards setpoints to the power section that energizes the motor.

Its signal front end accepts 5 V TTL step-direction streams at up to 400 kHz, allowing high-resolution position capture for fast servo applications. An onboard analog-to-digital converter with 12-bit resolution samples external reference voltages, while a dedicated digital-to-analog channel delivers a stabilized 5 V output for monitoring or torque-bias functions. The basic logic circuitry draws only 9 W, so thermal loading on the drive rack stays low. All real-time drive parameters are exchanged with the controller network over SERCOS III, providing deterministic fiber-based communication for multi-axis lines. Two ENS encoder interfaces support absolute and incremental emulation and can be wired up to 40 m away through the MEM link.

The differential receiver stage presents 120 ohms of input resistance, matching typical line drivers and helping limit reflection on long cable runs. Integrated transistor outputs can source up to 0.5 A for valve or contactor actuation, and the auxiliary encoder supply provides a regulated 11.6 V rail for external sensing heads. During power-up, the card draws a brief 6 A inrush before settling to its steady consumption. Pulse outputs at the MEM port reach a carrier rate of 1 MHz and a maximum pulse width of 60 ms, supporting high-speed master-slave synchronization. A Form C relay provides galvanic isolation for field signaling and is rated at 24 VDC and 1 A. The Safe Torque Off circuit is implemented on the board to remove drive energy at the hardware level when the safety chain opens.