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- Siemens
- 6SN1118-0NH01-0AA0
- Control Unit
- Germany
- 330 × 51 × 152 mm
- 0.9 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Siemens 6SN1118-0NH01-0AA0 is a SIMODRIVE 611 universal HR two-axis closed-loop control unit used in CNC drive systems. It supports incremental encoders, SIN/COS encoders with 1 Vpp signals, and absolute-value encoders using EnDat interfaces. Its speed/torque setpoint configuration allows it to operate within compatible feed-drive and spindle-drive arrangements. Optional modules can extend the system’s communication capabilities. <Cite refs={[“turn980339search15″,”turn980339search0″,”turn980339search8”]}/>
In a CNC machine tool, the control unit processes motion-related information and encoder feedback for the connected axes. When a machining center moves a cutting tool along a programmed path, the CNC controller issues movement commands and the drive system regulates the connected motors. The 6SN1118-0NH01-0AA0 handles the drive-control functions within this arrangement, while the power modules provide the electrical power required by the motors.
Its Universal HR configuration is relevant when selecting a control unit for an existing SIMODRIVE 611 system. The supported encoder interface is a key consideration: a machine using SIN/COS feedback or an appropriate EnDat absolute encoder must have a compatible control and parameter configuration. The control unit can also be expanded with supported options, depending on the installed hardware and communication requirements.
For example, a machine builder integrating two feed axes may use this unit to process encoder feedback and coordinate motor operation through the associated drive hardware. The final motion performance depends on the selected motors, feedback devices, mechanical transmission, drive parameters, and CNC software. The two-axis designation describes the control-unit capability; it does not mean every motor and feedback combination is automatically supported.
The 6SN1118-0NH01-0AA0 is a plug-in control component rather than a complete drive system. Its installation must be matched to the SIMODRIVE power modules, encoder wiring, motor configuration, and any selected option modules. When replacing an existing unit, verify the complete order number and stored machine parameters before commissioning.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6SN1118-0NH01-0AA0 |
| Product Family | SIMODRIVE 611 Universal |
| Product Type | Universal HR 2-Axis Closed-Loop Control Unit |
| Control Configuration | High Resolution (HR) |
| Number of Axes | 2 |
| Encoder Compatibility | Incremental encoders, SIN/COS 1 Vpp encoders, and compatible absolute encoders with EnDat interface |
| Setpoint Interface | Speed/torque setpoint |
| Optional Expansion | Supported option modules, depending on configuration |
| Drive Applications | Compatible feed-drive and spindle-drive configurations |
| Installation Type | Plug-in control unit |
| Compatible System | SIMODRIVE 611 Universal |
| Dimensions | 330 × 51 × 152 mm |
| Weight | 0.9 kg |
Product Features
- Two-axis closed-loop control: Supports two-axis operation within a compatible SIMODRIVE 611 Universal configuration.
- Multiple encoder interfaces: Supports incremental, SIN/COS 1 Vpp, and compatible EnDat absolute encoder arrangements.
- Speed/torque setpoint control: Processes the specified setpoint information for connected drive applications.
- Universal HR configuration: Provides the control functions associated with the SIMODRIVE 611 Universal HR range.
- Option-module expansion: Supports additional functions through compatible expansion modules.
- CNC drive integration: Works with the corresponding motors, power modules, and machine-control hardware.
- Encoder-based feedback: Uses compatible feedback signals to regulate the configured motor axes.
Working Principle
The 6SN1118-0NH01-0AA0 processes drive commands and encoder feedback within the SIMODRIVE 611 Universal system. The CNC controller specifies the requested motion, and the control unit works with the associated power modules to regulate motor operation.
A simplified arrangement is:
CNC Controller → 6SN1118-0NH01-0AA0 → SIMODRIVE Power Module → Motor → Machine Axis
Motor Encoder → Feedback Interface → Closed-Loop Control
During operation, the encoder reports movement information to the control system. The control unit processes this feedback alongside the configured setpoint information, allowing the drive to regulate the motor’s response to the command. The resulting axis behavior depends on the encoder type, motor characteristics, drive settings, and mechanical transmission.
Encoder compatibility matters during both installation and troubleshooting. Incremental encoders, SIN/COS 1 Vpp encoders, and EnDat absolute encoders use different signal arrangements and configuration requirements. A replacement control unit must match the feedback hardware already installed, or the system may require an appropriately engineered interface and parameter changes.
The unit can be extended with supported option modules where additional interfaces are needed. However, the available communication and expansion functions depend on the selected module and the control-unit software configuration. An optional PROFIBUS-DP interface, for example, should be treated as a separately configured system component rather than an assumed built-in function.
If a connected motor does not respond correctly, check the encoder signal, setpoint configuration, axis assignment, power-module status, and drive parameters. Mechanical faults should also be considered when encoder readings appear normal but the machine axis does not move as expected.
Role in the SIMODRIVE 611 Universal Drive Architecture
The 6SN1118-0NH01-0AA0 occupies the control position in the modular drive system. It processes the configured drive commands and encoder feedback, while the CNC controller, power modules, motors, and optional interfaces provide the surrounding functions.
CNC Controller → Universal HR Control Unit → Power Module → Motor → Machine Axis
| System Element | Function |
|---|---|
| CNC Controller | Generates motion commands and coordinates machining sequences |
| 6SN1118-0NH01-0AA0 | Processes two-axis closed-loop control and feedback information |
| SIMODRIVE 611 Power Module | Supplies controlled electrical power to the motor |
| Feed or Spindle Motor | Produces the required mechanical movement |
| Incremental or SIN/COS Encoder | Supplies compatible movement feedback |
| EnDat Absolute Encoder | Provides supported absolute-position information |
| Optional Interface Module | Adds supported communication or terminal functions |
| Drive Parameters | Define axis behavior, feedback scaling, and control settings |
| CNC Electrical Cabinet | Houses the control unit and associated drive hardware |
Industrial Applications
| Application | Practical Use |
|---|---|
| CNC Milling Machines | Processing feedback for compatible feed-axis configurations |
| CNC Turning Machines | Supporting configured feed and spindle-drive arrangements |
| CNC Machining Centers | Coordinating movement across two controlled axes |
| Machine Tool Retrofit Projects | Replacing a control unit when encoder and drive configurations match |
| Precision Positioning Equipment | Using compatible encoder feedback to regulate motor movement |
| Metalworking Production Lines | Integrating closed-loop drive control into CNC machinery |
| Automated Manufacturing Machinery | Coordinating drive motion with the machine controller |
| Modular SIMODRIVE Installations | Providing two-axis control within a larger drive architecture |
Installation and Maintenance
- Verify the complete order number: Confirm 6SN1118-0NH01-0AA0 and distinguish it from related NH-series variants with different hardware or software configurations.
- Check the axis arrangement: Confirm that the intended two-axis application matches the control unit and installed power modules.
- Identify the encoder type: Determine whether the connected feedback devices use incremental signals, SIN/COS 1 Vpp signals, or a compatible EnDat absolute interface.
- Verify interface compatibility: Check the encoder wiring, connector assignments, and signal requirements against the installed control configuration.
- Review optional modules: Confirm whether the machine uses terminal or communication expansion and verify that the selected modules match the intended configuration.
- Isolate the drive system: Follow the approved shutdown, electrical isolation, and DC-link discharge procedures before removing or installing the control unit.
- Inspect connectors and cables: Check for loose contacts, damaged insulation, contamination, or wiring errors that could affect feedback or control signals.
- Back up machine parameters: Save the existing drive configuration and relevant machine data before replacing the unit.
- Verify software compatibility: Confirm that the installed drive firmware and commissioning software support the control-unit version and intended application.
- Check feedback direction and scaling: Confirm that the encoder signals correspond to the expected motor direction and configured engineering units.
- Commission under controlled conditions: Test the axis response using the approved procedure before returning the machine to normal production.
- Record the final configuration: Document the control-unit reference, encoder types, optional modules, software configuration, and commissioning results.
Compatible System Components
| Component | Function |
|---|---|
| Siemens 6SN1118-0NH01-0AA0 | Provides two-axis SIMODRIVE 611 Universal HR control |
| SIMODRIVE 611 Power Modules | Supply controlled power to compatible motors |
| CNC Controller | Generates movement commands and coordinates machine operation |
| Compatible Feed Motors | Produce movement for the configured feed axes |
| Compatible Spindle Motors | Support spindle operation in suitable drive configurations |
| Incremental Encoders | Supply incremental movement feedback |
| SIN/COS 1 Vpp Encoders | Provide compatible encoder signals |
| EnDat Absolute Encoders | Supply supported absolute-position feedback |
| SIMODRIVE 611 Option Modules | Add compatible terminal or communication functions |
| Drive Parameter Configuration | Defines axis behavior, feedback scaling, and control settings |
Recommended Related Models
| Model | Product Type | Typical Application |
|---|---|---|
| Siemens 6SN1118-0NH01-0AA1 | SIMODRIVE 611 Universal HR 2-Axis Control Unit | Comparing a related two-axis control-unit version |
| Siemens 6SN1118-0NH00-0AA0 | SIMODRIVE 611 Universal 2-Axis Control Unit | Evaluating a related control configuration with different hardware or firmware generation |
| Siemens 6SN1118-1NH01-0AA0 | SIMODRIVE 611 Universal HR 2-Axis Positioning Control Unit | Applications requiring the corresponding positioning configuration |
| Siemens 6SN1118-0NK01-0AA0 | SIMODRIVE 611 Universal HR 2-Axis Resolver Control Unit | Drive systems using compatible resolver feedback |
| Siemens 6SN1118-0NJ01-0AA0 | SIMODRIVE 611 Universal HR 1-Axis Resolver Control Unit | Single-axis applications using compatible resolver feedback |
| Siemens 6SN1118-0NH11-0AA0 | SIMODRIVE 611 Universal HR 2-Axis Control Unit | Comparing the related control configuration for compatible SIMODRIVE systems |
Key Advantages
- Supports two-axis closed-loop control in the SIMODRIVE 611 Universal system.
- Accommodates compatible incremental, SIN/COS 1 Vpp, and EnDat encoder arrangements.
- Processes speed/torque setpoint information for supported drive configurations.
- Supports expansion through compatible option modules.
- Integrates with modular CNC drive hardware and machine-control systems.
Technical FAQs
Which encoder interfaces can be used with the 6SN1118-0NH01-0AA0?
The unit supports incremental encoders, SIN/COS encoders with 1 Vpp signals, and compatible absolute encoders using EnDat. The actual encoder must match the control-unit configuration, wiring, and drive parameters.
What is the difference between an NH-series and an NK-series control unit?
The NH series is associated with encoder-based configurations, while the NK series is intended for resolver feedback. The replacement must match the feedback device installed on the machine rather than being selected solely by axis count.
Can communication interfaces be added to this control unit?
The SIMODRIVE 611 Universal control architecture supports compatible option modules for additional functions. The available interface depends on the selected module, firmware, and installed configuration.
What should be checked if the motor does not follow the commanded movement?
Check the encoder signal, setpoint configuration, axis assignment, drive parameters, and power-module status. If the feedback appears correct but the machine movement is inaccurate, inspect the motor coupling and mechanical transmission as well.