6FC5357-0BB35-0AB0 Siemens NCU 573.5B CNC Control Hardware

Product Description

The Siemens 6FC5357-0BB35-0AB0 is a compact numerical control unit (NCU 573.5B) designed for the SINUMERIK 840D/DE CNC platform. This module consolidates motion control, PLC functionality, and industrial communication interfaces, delivering deterministic CNC performance for high-precision machining and automation tasks.

Equipped with an Intel Pentium M 1.4 GHz processor, the unit ensures rapid execution of control commands and smooth coordination of multi-axis operations. It features 3 MB NC memory for motion programs, 128 MB DRAM, and 8 MB SRAM, providing reliable and stable system performance. The embedded S7-300 PLC (317-2 DP) with 128 KB memory allows seamless automation integration, while PROFIBUS DP communication ensures interoperability with connected devices. Built to IEC 61508 safety standards, this NCU offers dependable operation in industrial environments, including machine tools, robotics, and precision manufacturing.

Note that the 6FC5357-0BB35-0AB0 was discontinued in 2015. For modern projects, Siemens recommends upgrading to newer NCUs such as the NCU 720.3B PN or NCU 720.5, although spare parts and repair services remain available for legacy systems.

Technical Specifications

Key Features

• High-performance CNC control for SINUMERIK 840D/DE systems.

• Integrated S7-300 PLC 317-2 DP for automation logic.

• Dedicated NC memory (3 MB) for precise motion programs.

• PROFIBUS DP support for industrial network communication.

• Compact module design suitable for tight integration.

• Compliance with IEC 61508 ensures functional safety.

• Legacy unit ideal for maintenance, repair, or upgrades.