Siemens 6FC5210-0DF21-2AA0 SINUMERIK 840D sl NCU 720.2 PN Numerical Control Unit
Item NO.: 3747513
Warranty: 1 year
Condition : brand new in factory sealed box
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Detail
- Product NameSiemens 6FC5210-0DF21-2AA0 SINUMERIK 840D sl NCU 720.2 PN Numerical Control Unit
- Item NO.3747513
- Weight3.8000 kg = 8.3776 lb = 134.0411 oz
- CategoryPLC
- BrandSiemens
- Creation Time2026-08-26
- SINUMERIK 840D sl NCU 720.2 PN Numerical Control Unit
6FC5210-0DF21-2AA0
SINUMERIK 840D sl NCU 720.2 PN
Lifecycle Status: Discontinued (PM410)
Overview
6FC5210-0DF21-2AA0 is a Siemens SINUMERIK 840D sl NCU 720.2 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).
Order number 6FC5210-0DF21-2AA0 · 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
Specifications
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
Features
CNC & Motion Control
- High-performance CNC control for up to 31 axes
- Support for up to 10 processing channels
- Multi-axis interpolation for complex machining
- Integrated HMI services for operator interface
- Support for SINUMERIK Handheld Terminal HT 8 / HT 2
- Up to 4 operator panel fronts with TCU
PLC & Communication
- Integrated SIMATIC S7-300 PLC (319-3PN/DP)
- PROFINET interface with IO and CBA support
- PROFIBUS DP for distributed I/O
- Distributed I/O via PROFIBUS DP or PROFINET IO
- Integration with SINAMICS S120 drive system
- DRIVE-CLiQ interface for drive connectivity
Modular and open system architecture
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
Lifecycle
Status & Availability
- Lifecycle status: Discontinued (PM410)
- Product discontinuation date: October 1, 2017
- Product support: Completed
- Product family: SINUMERIK 840D sl
- Availability: Spare parts and used/refurbished units only
Replacement Information
Recommended replacement: 6FC5373-0AA01-0AA2 (NCU 730.2 PN)
Replacement requirements:
- • Use NCU 730.2 PN (MLFB 6FC5373-0AA01-0AA2)
- • Adjust PLC project hardware configuration in STEP 7
- • No additional restrictions or hardware changes required
- • Alternative: NCU 720.3B PN or NCU 720.5 for new installations
Recommended Models
| Model | Model |
|---|---|
| IC693MDL646C | FMC250 |
| NTPS-24-1.3 | DXR2.M18-101A |
| TXS1.12F10 | SC-MV04FL |
| KFD2-SR2-EX1.W.LB | RXC32.1 |
| UDK-04-10 | CNX-B12W |
| REG-K/8x230/16 | IM72-11Ex/L |
| DBS1224B4W | CB-400 |
| H7080B2103 | KZT11 |
| AX-LDPT482V-1 | OM40BHOND |
| PT5402 | FCA/S 1.1M |
| SG-TL70-G | LG-003552 |
| EV669 | SB-4Z-UN |
| FCSM082300 | 3TX7116-5FC13C |
| PR6 2925M1221 | 1C31227G01 |
| T8123 PoE-30W | CAT5e/6/7 |
Frequently Asked Questions
Is 6FC5210-0DF21-2AA0 discontinued?
Yes, this product has been discontinued (lifecycle status PM410). The discontinuation date was October 1, 2017. Product support has been completed.
What is the recommended replacement for this NCU?
Siemens recommends using the NCU 730.2 PN (MLFB 6FC5373-0AA01-0AA2) as a replacement. The PLC project hardware configuration must be adjusted in STEP 7, but no additional restrictions apply.
What is the maximum number of axes this NCU can control?
The NCU 720.2 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 720.2 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.
