The SINUMERIK 840D sl CNC offers modularity, openness, flexibility and uniform structures for operation, programming, and visualization. It provides a system platform with trend-setting functions for almost all technologies.

Integrated into the SINAMICS S120 drive system and complemented by the SIMATIC S7-300 automation system, the SINUMERIK 840D sl forms a complete digital system that is ideally suited for the mid to upper performance range.

SINUMERIK 840D sl is characterized by:

  • A high degree of flexibility
  • Excellent dynamic response and precision
  • Optimum integration into networks
  • Outstanding performance and flexibility for multi-axis systems of average to high complexity thanks to scalable hardware and software
  • Universal openness of the user interface, the PLC and the NCK area to allow integration of your specialist know-how
  • Integrated safety functions for man and machine: SINUMERIK Safety Integrated
  • Comprehensive range of products for integrating machine tools into communication, engineering and production processes: SINUMERIK Integrate

The SINUMERIK 840D sl can be deployed around the world for the following technologies:

  • Turning
  • Drilling
  • Milling
  • Grinding
  • Laser machining
  • Nibbling
  • Punching
  • Tool and mold making
  • High-speed cutting applications
  • Woodworking and glass processing
  • Handling
  • Transfer lines
  • Rotary indexing machines
  • Mass production
  • JobShop production

The SINUMERIK 840DE sl is available as an export version for use in countries where approval is required.


The SINUMERIK 840D sl combines CNC, HMI, PLC, closed-loop control and communication tasks on one SINUMERIK NCU (NCU 710.3B PN/NCU 720.3B PN/NCU 730.3B PN).

For operation, programming and visualization, the corresponding HMI software is already integrated into the CNC software for the NCU and therefore executes on the high-performance NCU multi-processor module. For enhanced operating performance, the SINUMERIK PCU 50.5 industrial PC can be used.

Up to 4 distributed SINUMERIK OP operator panels can be operated on one NCU or PCU. The operator panel can be installed as a Thin Client at a distance of up to 100 m (328 ft).

The high-performance NCU multi-processor module can be installed to the left of the Line Module of the SINAMICS S120 drive system. If necessary, the NCU can be installed separately at a distance of up to 100 m (328 ft). MOTION-CONNECT DRIVE-CLiQ cables from Siemens are used for the connections. SINUMERIK 840D sl offers integrated PROFINET functionality and supports PROFINET CBA and PROFINET IO.

Matched modular system

The SINUMERIK 840D sl CNC is modular in design, offering outstanding flexibility and openness for any machine application. Entirely in line with the motto “Mix and Match”, the components can be perfectly matched to each other – tailored precisely to the requirements of the mechanical engineer and the subsequent operating environment of the machine.

Performance and flexibility

The scalability of the hardware and software – both in the CNC and the operating area – provides exceptional conditions for using SINUMERIK 840D sl in many sectors. The possibilities range from simple positioning tasks up to complex multi-axis systems. We offer different types of NCU for your machining tasks.

A total of 8 axes is provided by SINUMERIK 840D sl with NCU 710.3B PN, while the number of axes can be increased to a maximum of 31 in combination with the NCU 720.3B PN/NCU 730.3B PN.

Up to 3 NCUs can be connected with the CBE30-2 communication module via NCU-Link. Thus, up to 93 CNC-controlled axes/spindles and 150 CNC and PLC-controlled axes/spindles can be implemented.



Connection overview for SINUMERIK 840D sl NCU710.3B PN/NCU720.3B PN/NCU730.3B PN

Technical specifications

Article number





Product brand name


Product type designation

840D sl

Product short term

NCU 710.3B PN

NCU 720.3B PN

NCU 730.3B PN

Product designation

CNC control

Type of PLC as SIMATIC S7 Integrated

PLC 317-3 PN/DP

Storage capacity of main memory 1



  • ● Type of main memory 1


Storage capacity of main memory 2



  • ● Type of main memory 2


Supply voltage at DC rated value



Active power consumption maximum




Power loss [W] typical




Degree of protection


  • ● note

IPXXB with cover for option slot

Environmental category acc. to IEC 60721-3-3

Condensation and icing excluded. Low air temperature 0 °C (32 °F).

Relative humidity at 25 °C (77 °F), during

  • ● storage


5 … 95

  • ● transport


5 … 95

  • ● operation


5 … 95

Ambient temperature, during

  • ● storage

°C (°F)

-25 … +55 (-13 … +131)

  • ● transport

°C (°F)

-40 … +70 (-40 … +158)

  • ● operation

°C (°F)

0 … 55 (32 … 131)


mm (in)

50 (1.9685)


mm (in)

455 (17.91339)


mm (in)

272 (10.70866)

Net weight

kg (lb)

3.7 (8.1571)

3.9 (8.59803)

Certificate of suitability

CE, cULus

Product manuals

# File Description Date added File size Downloads
1 pdf restrict_hmi_sl_ncu_base_25hf2_76 10/21/2017 18:13 43 KB 268