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The ABB NDCU-12C (often listed as RDCU-12C) is an industrial drive control unit designed to interface with ABB variable frequency drives (VFDs) — particularly models in the ACS800
multi-drive family and similar automation systems.This control unit serves as an I/O (input/output) and logic control interface between the drive and external signals,
sensors, actuators or higher-level automation systems. It enhances the drive’s control flexibility and enables
precise regulation of motor functions within automated processes.
Q1. What is the NDCU-12C / RDCU-12C used for?
A: It’s a drive control unit that provides additional input/output channels and communication paths for ABB drives (like ACS800), letting the drive interface
efficiently with sensors, actuators, PLCs, and automation systems.
Q2. What kinds of signals does this unit support?
A: It typically supports digital and analog inputs, analog outputs, and sometimes relay outputs — enabling
measurement (e.g., 4–20 mA/0–10 V) and control of field devices.
Q3. How does it communicate with other equipment?
A: It commonly offers RS-485, and in some implementations CAN communication
interfaces, making integration with PLCs and supervisory systems possible.
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