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Siemens 6FC5210-0DF53-3AA0 SINUMERIK NCU 720.3 PN Numerical Control Unit

Siemens 6FC5210-0DF53-3AA0 SINUMERIK NCU 720.3 PN Numerical Control Unit

Item NO.: 3747616
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Detail

  • Product NameSiemens 6FC5210-0DF53-3AA0 SINUMERIK NCU 720.3 PN Numerical Control Unit
  • Item NO.3747616
  • Weight3.8000 kg = 8.3776 lb = 134.0411 oz
  • CategoryPLC
  • BrandSiemens
  • Creation Time2026-08-26
  • SINUMERIK NCU 720.3 PN Numerical Control Unit
6FC5210-0DF53-3AA0 | SINUMERIK NCU 720.3 PN · Official Technical Data

6FC5210-0DF53-3AA0

SINUMERIK NCU 720.3 PN · Numerical Control Unit
31 axes / 10 channels PROFINET integrated PLC 319-3PN/DP CNC user memory 3 MB
Lifecycle Status: Discontinued (PM410)
Product Profile

6FC5210-0DF53-3AA0 is a Siemens SINUMERIK NCU 720.3 PN numerical control unit. It combines CNC, HMI, PLC, closed-loop control, and communication tasks within a single module. Designed for medium to upper performance range applications, it integrates a PROFINET interface and a SIMATIC S7-300 PLC (319-3PN/DP). This version features an Intel Celeron M 1.2 GHz processor with 512 MB DDR2-SDRAM.

Order number 6FC5210-0DF53-3AA0 · Discontinued product

  • • CNC user memory: 3 MB (standard, expandable to 15 MB)
  • • PLC user memory: 512 KB
  • • Integrated PLC: SIMATIC S7-300 PLC 319-3PN/DP
  • • Communication: PROFINET IO, PROFINET CBA, PROFIBUS DP
Technical Data

Control & Performance

  • Processor: Intel Celeron M 1.2 GHz
  • RAM: 512 MB DDR2-SDRAM
  • Non-volatile memory: 1 MB SRAM
  • CNC user memory: 3 MB (expandable to 15 MB)
  • PLC user memory: 512 KB
  • Integrated PLC: S7-300 319-3PN/DP
  • Maximum axes: 31
  • Maximum channels: 10
  • Max. axes per channel: 12
  • Interpolation: Max. 12 axes

Interfaces & Environment

  • PROFINET: Integrated (2-port switch)
  • PROFIBUS DP: Integrated
  • Communication: PROFINET IO, PROFINET CBA
  • Power supply: 24V DC
  • Protection class: IP20
  • Ambient temperature (operation): 0°C ~ 55°C
  • Storage temperature: -25°C ~ +55°C
  • Relative humidity (operation): ≤ 85% (max 2 months)
IEC 61131-3 compliant · Internal heat dissipation
System Role

The NCU 720.3 PN serves as a central numerical control unit in the SINUMERIK system, designed for:

  • CNC control for up to 31 axes and 10 processing channels
  • Multi-axis interpolation for complex machining operations
  • PLC control with integrated S7-300 319-3PN/DP
  • Communication hub via PROFINET and PROFIBUS DP
  • Drive integration with SINAMICS S120 via DRIVE-CLiQ
  • HMI connectivity with SINUMERIK Handheld Terminal HT 8 / HT 2
Compatibility

Drop-in Replacements

  • Predecessor: 6FC5210-0DF53-2AA0
  • Successor: 6FC5210-0DF53-3AA0 (current version)
  • Compatibility: The successor is fully compatible with the original design
  • Replacement: Direct drop-in replacement, but commissioning is required
  • Programming software: STEP 7 V5.5 or higher
  • Configuration: SINUMERIK 840D sl option package required

Long-term Migration (SINUMERIK ONE)

Recommended SINUMERIK ONE replacement: 6FC5373-0AA01-0AA2 (NCU 730.2 PN)

Migration requirements:

  • • Program must be ported to SINUMERIK Operate environment
  • • Hardware module replaced with NCU 730.2 PN
  • • Adjust PLC project hardware configuration in STEP 7
  • • No additional restrictions or hardware changes required
Applications
  • CNC machine tools (milling, turning, grinding, drilling)
  • Multi-axis automation and robotics
  • Precision manufacturing (automotive, aerospace, medical)
  • Production lines requiring coordinated motion control
  • Legacy system maintenance and upgrades
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Frequently Asked Questions
Is 6FC5210-0DF53-3AA0 still available from Siemens?
No, this product has been discontinued. It is only available as a spare part or as refurbished/used units. The official successor is 6FC5373-0AA01-0AA2 (NCU 730.2 PN).
What is the difference between 6FC5210-0DF53-3AA0 and 6FC5210-0DF52-3AA0?
The 6FC5210-0DF53-3AA0 is an NCU 720.3 PN, while 6FC5210-0DF52-3AA0 is an NCU 720.2 PN. The 720.3 version includes additional features such as improved real-time capabilities and enhanced memory management.
What is the maximum number of axes this NCU can control?
The NCU 720.3 PN supports up to 31 axes in max. 10 processing channels with max. 12 axes/spindles per channel. Multi-axis interpolation is possible for max. 12 axes.
Which drive system is compatible with this NCU?
The NCU 720.3 PN is designed to work with the SINAMICS S120 drive system. It also supports distributed I/O via PROFIBUS DP or PROFINET IO.
Can the CNC user memory be expanded?
Yes, the standard 3 MB CNC user memory can be optionally expanded to 15 MB. The PLC user memory is fixed at 512 KB.
What programming software is required for this system?
Requires STEP 7 V5.5 or higher. The SINUMERIK 840D sl option package is needed for configuration.

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