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- Siemens
- 6SN1118-1NH01-0AA0
- 2-Axis Control Unit
- Germany
- 330 × 51 × 152 mm
- 0.859 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Siemens 6SN1118-1NH01-0AA0 is a SIMODRIVE 611 universal HR two-axis closed-loop control unit for motors using compatible incremental or absolute encoder feedback. It supports speed, torque, and positioning functions, allowing it to serve as the drive-control component in machine-tool and industrial motion-control systems.
In a CNC machine, two controlled axes may need to follow separate movement commands while maintaining accurate motor feedback. This control unit processes the configured drive commands and feedback signals for two axes, working with the associated power modules to regulate motor operation. The higher-level machine controller coordinates the movement sequence, while the drive system handles the corresponding closed-loop control tasks.
The module supports compatible encoder systems using sin/cos 1 Vpp or TTL signals, as well as supported absolute encoder configurations using EnDat. The precise feedback arrangement depends on the motor, encoder interface, firmware, and configured drive system. Selecting the correct feedback technology is essential because the control unit must interpret the incoming signals using the appropriate interface and parameters.
The 1NH01 designation identifies a positioning-capable two-axis control-unit variant in the SIMODRIVE 611 universal HR family. It differs functionally from the related 0NH01 speed/torque setpoint version. When replacing an existing unit, engineers should verify the complete order number, encoder type, firmware generation, and required positioning functions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model / Article Number | 6SN1118-1NH01-0AA0 |
| Product Family | SIMODRIVE 611 universal HR |
| Product Type | 2-Axis Closed-Loop Control Unit |
| Number of Axes | 2 |
| Feedback Interfaces | Compatible sin/cos 1 Vpp or TTL incremental encoders; supported absolute encoder configurations |
| Absolute Encoder Interface | EnDat, where supported by the configuration |
| Control Functions | Speed, torque, and positioning |
| Drive System | SIMODRIVE 611 universal |
| Expansion Capability | Compatible TERMINALS or PROFIBUS-DP option modules |
| Typical Applications | CNC feed drives and industrial motion-control systems |
| Dimensions | 330 × 51 × 152 mm |
| Weight | 0.859 kg |
Product Features
- Two-axis control: Provides two drive-control channels within a single control board.
- Positioning capability: Supports positioning functions in addition to speed and torque control.
- Incremental encoder support: Accommodates compatible sin/cos 1 Vpp or TTL feedback arrangements.
- Absolute encoder compatibility: Supports applicable EnDat feedback configurations.
- SIMODRIVE 611 integration: Operates with compatible power modules and machine-control systems.
- Optional interface expansion: Supports designated TERMINALS or PROFIBUS-DP modules where required.
- Independent axis channels: Allows separate control parameters and feedback assignments for the two axes.
- Configuration-specific operation: Requires the correct firmware, motor data, encoder interface, and positioning parameters.
Working Principle
The 6SN1118-1NH01-0AA0 operates as the closed-loop control element for two compatible drive axes. It receives movement commands from the machine controller and processes the corresponding motor feedback to regulate the connected drive system.
A typical arrangement follows this sequence:
Machine Controller → Setpoint and Position Commands → 6SN1118-1NH01-0AA0 → Power Modules → Motors
Motor Encoders → Feedback Signals → Control Unit
During a positioning operation, the controller supplies the required movement command. The control unit processes the configured position and speed information alongside the feedback received from the connected encoder. The associated power module then drives the motor according to the control system’s requirements.
For example, a machine tool may use two feed axes to position a tool and a workpiece table. Each axis has its own movement requirements, motor data, and feedback channel. The control unit handles the configured drive-control functions, while the machine controller coordinates the axes with the machining sequence.
Encoder compatibility directly affects measurement interpretation. A sin/cos incremental encoder and an absolute encoder using EnDat do not provide identical signal formats or initialization requirements. The selected control-unit configuration and firmware must support the installed encoder and its communication method.
The control unit does not independently provide the motors’ main electrical power. It operates as part of the SIMODRIVE 611 architecture, relying on compatible power modules, motors, encoder connections, and a properly configured machine-control interface.
Role in the SIMODRIVE 611 Control Architecture
The 6SN1118-1NH01-0AA0 occupies the drive-control layer between the machine controller and the power stages. It processes the configured control commands and feedback for two axes, while the power modules operate the motors and the machine controller coordinates the overall movement sequence.
Machine Controller → Position and Speed Commands → 6SN1118-1NH01-0AA0 → Power Modules → Motors
Motor Encoders → Feedback Connections → Control Unit
| System Component | Function |
|---|---|
| 6SN1118-1NH01-0AA0 | Provides two-axis closed-loop control with positioning capability |
| SIMODRIVE 611 Power Modules | Supply the connected motors |
| Compatible Siemens Motors | Produce the required mechanical movement |
| Incremental or Absolute Encoders | Provide supported motor-position feedback |
| Machine Controller | Coordinates axis commands and machine sequences |
| Encoder Feedback Cables | Carry position or speed-related signals to the control unit |
| Motor Power Cables | Connect motors to their corresponding power stages |
| TERMINALS Option Module | Provides supported terminal-interface functionality |
| PROFIBUS-DP Option Module | Adds compatible fieldbus communication where configured |
| Commissioning Tools | Support drive parameterization and functional testing |
Industrial Applications
| Application | Typical Use |
|---|---|
| CNC Machine Tools | Controlling two positioning-capable feed axes |
| Machine-Tool Feed Drives | Coordinating tool and workpiece movement |
| Industrial Positioning Systems | Regulating two motor-driven axes |
| Metalworking Machinery | Controlling feed movement during machining |
| Automated Production Equipment | Integrating two controlled axes into a machine sequence |
| Material Processing Systems | Coordinating motorized positioning mechanisms |
| Industrial Motion-Control Cabinets | Providing two-axis closed-loop drive control |
| Machine Rebuilding Projects | Replacing a control unit after encoder and firmware compatibility checks |
| Existing SIMODRIVE Installations | Maintaining compatible motion-control configurations |
| Multi-Axis Machinery | Managing two axes within a larger machine-control architecture |
Installation and Maintenance
- Verify the complete order number: Confirm 6SN1118-1NH01-0AA0 and distinguish it from the related 6SN1118-0NH01 speed/torque control variant.
- Check the drive-system configuration: Confirm that the installed SIMODRIVE 611 system supports the control unit and its required firmware generation.
- Identify the encoder type: Determine whether each connected motor uses sin/cos 1 Vpp, TTL, or a supported absolute encoder interface.
- Confirm power-module compatibility: Verify that the associated power stages are suitable for the connected motors and intended operating conditions.
- Isolate the equipment: Follow the approved electrical safety procedure and verify that hazardous energy has been removed before accessing the drive system.
- Inspect encoder wiring: Check feedback cables, connectors, shielding, and channel assignments for damage or incorrect connections.
- Review optional interfaces: Confirm whether the installation requires a TERMINALS or PROFIBUS-DP option and verify the selected module’s compatibility.
- Verify motor and encoder parameters: Check motor data, encoder configuration, scaling, and the relevant control settings for both axes.
- Check positioning configuration: Confirm that the required positioning functions and associated machine-controller commands are configured correctly.
- Test feedback channels: During controlled commissioning, verify that each encoder signal corresponds to the intended motor and axis.
- Investigate positioning errors: Check encoder feedback, axis assignment, motor parameters, mechanical transmission, and control settings if the commanded and actual movement differ.
- Document the final configuration: Record the control-unit order number, firmware generation, encoder types, motor assignments, option modules, and commissioning parameters.
Compatible System Components
| Component | Function |
|---|---|
| Siemens SIMODRIVE 611 Power Modules | Supply electrical power to the connected motors |
| Compatible Siemens Motors | Provide the mechanical drive for each controlled axis |
| Compatible sin/cos 1 Vpp Encoders | Provide incremental position feedback |
| Compatible TTL Encoders | Supply supported incremental feedback signals |
| Compatible EnDat Absolute Encoders | Provide absolute-position feedback where supported |
| Encoder Feedback Cables | Connect the encoder signals to the control unit |
| Motor Power Cables | Connect the motors to their associated power stages |
| Higher-Level Machine Controller | Generates movement commands and coordinates machine operation |
| Siemens 6SN1114-0NA00-0AA0 TERMINALS Option | Provides supported terminal-interface functionality |
| Siemens 6SN1114-0NB00-0AA2 PROFIBUS-DP2 Option | Adds compatible PROFIBUS communication functionality |
Recommended Related Models
| Model | Product Type | Typical Application |
|---|---|---|
| Siemens 6SN1118-1NH01-0AA0 | 2-Axis Closed-Loop Control Unit | Two-axis control with positioning capability |
| Siemens 6SN1118-0NH01-0AA0 | 2-Axis Closed-Loop Control Unit | Two-axis speed/torque setpoint control |
| Siemens 6SN1118-1NH01-0AA1 | 2-Axis Closed-Loop Control Unit | Related positioning-capable control configuration |
| Siemens 6SN1118-0NJ01-0AA0 | 1-Axis Closed-Loop Control Unit | Single-axis control using compatible sin/cos or TTL encoder feedback |
| Siemens 6SN1118-1NJ01-0AA1 | 1-Axis Positioning Control Module | Single-axis positioning control |
| Siemens 6SN1114-0NB00-0AA2 | PROFIBUS-DP2 Option Module | Adding compatible PROFIBUS communication functionality |
Key Advantages
- Provides two-axis closed-loop control within the SIMODRIVE 611 system.
- Supports positioning alongside speed and torque control.
- Accommodates compatible incremental and absolute encoder configurations.
- Allows separate feedback and parameter settings for two controlled axes.
- Supports optional interface expansion where required.
- Integrates with compatible power modules and higher-level machine controllers.
Technical FAQs
How does the 6SN1118-1NH01-0AA0 differ from the 6SN1118-0NH01-0AA0?
The 6SN1118-1NH01-0AA0 is the positioning-capable two-axis variant, while the 6SN1118-0NH01-0AA0 is associated with speed/torque setpoint control. Select the version according to the required drive functions and machine configuration.
Which encoder interfaces can be used with this control unit?
The SIMODRIVE 611 universal HR family supports applicable sin/cos 1 Vpp and TTL incremental encoder configurations, as well as supported absolute encoder arrangements using EnDat. The exact interface must match the control-unit configuration, firmware, and connected motor.
Can the unit control two axes even if only one axis is currently required?
Yes. The SIMODRIVE 611 universal control-board architecture permits two-axis boards to be used in suitable single-axis applications. The power-module arrangement, feedback configuration, and system setup must still be compatible.
What should be checked if the motor reaches the commanded speed but positioning remains inaccurate?
Check the encoder type and wiring, feedback scaling, axis parameters, positioning configuration, and mechanical transmission. Also verify that the control unit and machine controller use matching units and coordinate settings.