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- Siemens
- 6SN1118-0DH21-0AA0
- Control Unit
- Germany
- 330 × 51 × 127 mm
- 1 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Siemens 6SN1118-0DH21-0AA0 is a SIMODRIVE 611-D closed-loop plug-in performance control unit for two digital feed-drive axes. It is intended for compatible CNC machine-tool drive systems that require coordinated control of two feed motors without a direct measuring system.
In a SIMODRIVE 611-D installation, the control unit manages the drive-control functions for its assigned axes. It operates with the associated power modules, motor feedback arrangements, and numerical control system. The power modules supply the electrical energy required by the motors, while the control unit processes motion commands and regulates the connected drives according to their configured operating parameters.
The two-axis configuration is particularly useful in machine tools where two feed axes need to operate as part of the same CNC motion-control architecture. For example, a machining center may use separate motors to move a table and a carriage. The numerical control coordinates their movements, while the drive system regulates each motor in accordance with the required motion profile.
This model uses a feedback arrangement without a direct measuring system. Drive regulation therefore depends on the supported motor feedback configuration rather than a separate direct measurement of the machine axis. The mechanical transmission, feedback components, and drive settings all influence the resulting axis behavior.
The performance-control designation distinguishes this unit from standard-control variants within the SIMODRIVE family. Selection should account for the intended drive application and the requirements of the existing CNC system, particularly where a replacement must match the original control architecture.
The 6SN1118-0DH21-0AA0 is a drive-control component rather than a standalone motor power supply. Its operation depends on the compatible power sections, connected motors, feedback signals, and numerical control working together as a complete system.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6SN1118-0DH21-0AA0 |
| Product Family | SIMODRIVE 611-D |
| Product Type | Closed-Loop Plug-In Control Unit |
| Axis Configuration | 2 axes |
| Drive Application | Digital feed drives |
| Control Category | Performance closed-loop control |
| Direct Measuring System | Not included |
| Drive Architecture | SIMODRIVE 611-D digital drive system |
| Installation Type | Plug-in control unit |
| Dimensions | 330 × 51 × 127 mm |
| Weight | 1 kg |
Product Features
- Two-axis control: Manages two feed-drive axes within a compatible SIMODRIVE 611-D installation.
- Performance closed-loop regulation: Supports regulated motor operation using the configured drive-control and feedback arrangements.
- Digital feed-drive application: Intended for compatible CNC feed-drive systems.
- No direct measuring system: Uses the supported motor feedback arrangement rather than a separate direct machine-axis measurement system.
- Modular drive integration: Works with the corresponding power modules and associated drive components.
- CNC coordination: Supports coordinated axis operation within a numerical-control system.
- Axis-specific parameterization: Requires suitable settings for the connected motors, feedback devices, and mechanical transmissions.
- Motor feedback processing: Uses the configured feedback information to regulate drive operation.
- Machine-tool integration: Fits compatible SIMODRIVE 611-D installations used in CNC machinery.
- Maintenance replacement: Can serve as a replacement control unit when the original hardware and drive configuration match.
Working Principle
The 6SN1118-0DH21-0AA0 regulates two digital feed-drive axes within a SIMODRIVE 611-D system. It receives motion commands from the numerical control and works with the corresponding power modules and motor feedback signals to control the connected drives.
CNC Numerical Control → SIMODRIVE 611-D Control Unit → Power Modules → Feed Motors → Machine Axes
The numerical control generates the movement commands required by the machine program. The control unit processes the drive-control requirements for the two assigned axes, while the power modules supply the electrical power needed by the motors.
Each motor converts electrical energy into mechanical rotation. Through a ball screw, gearbox, or other transmission, this rotation moves the corresponding machine axis. The configured motor feedback provides information used by the control system to regulate drive operation.
Because the unit is specified without a direct measuring system, the drive architecture does not depend on a separate direct measurement device for each machine axis. The control behavior instead depends on the supported motor feedback arrangement and the mechanical relationship between each motor and its driven axis.
The two axes must be configured for their respective motors and mechanical loads. Incorrect axis assignments, feedback connections, or drive parameters can affect positioning and movement coordination. During commissioning, engineers should verify both axes individually before testing coordinated motion.
If one axis fails to respond or behaves inconsistently, the investigation should include the control-unit configuration, associated power module, motor feedback, mechanical transmission, and CNC command sequence.
Role in a SIMODRIVE 611-D Control Architecture
The 6SN1118-0DH21-0AA0 provides the control functions for two feed axes within the digital drive system. The numerical control generates the motion commands, the power modules drive the motors, and the mechanical transmissions convert motor rotation into machine movement.
CNC Numerical Control → SIMODRIVE 611-D Control Unit → Power Modules → Feed Motors → Machine Axes
| System Component | Function |
|---|---|
| Siemens 6SN1118-0DH21-0AA0 | Provides performance closed-loop control for two digital feed axes |
| SIMODRIVE 611-D Power Modules | Supply electrical power to the connected feed motors |
| Feed-Drive Motors | Produce controlled movement for the assigned machine axes |
| Motor Feedback Components | Supply feedback information used by the drive-control arrangement |
| Numerical Control System | Generates motion commands and coordinates axis movements |
| Mechanical Transmissions | Convert motor rotation into linear or rotary machine movement |
| Drive Power Supply | Supplies electrical energy to the drive system |
| Machine Interlock System | Coordinates permitted operation with machine conditions and protective functions |
Industrial Applications
| Application | Typical Use |
|---|---|
| CNC Milling Machines | Coordinating two feed axes during programmed machining |
| CNC Machining Centers | Controlling compatible table and carriage movements |
| CNC Grinding Machines | Regulating two feed mechanisms in a compatible drive architecture |
| CNC Turning Machines | Controlling feed axes used for tool positioning |
| Precision Machine Tools | Regulating coordinated feed movement using motor feedback |
| Automated Production Machinery | Operating two compatible digital feed-drive axes |
| Machine-Tool Feed Systems | Coordinating slide, carriage, or table movement |
| CNC Retrofit Projects | Replacing a matching two-axis SIMODRIVE 611-D control unit |
| Industrial Motion Systems | Supporting compatible digital feed-drive configurations |
| Machine Maintenance | Restoring two-axis drive control in an existing installation |
Installation and Maintenance
- Confirm the control-unit reference: Verify that 6SN1118-0DH21-0AA0 matches the required two-axis SIMODRIVE 611-D application.
- Review the drive architecture: Identify both associated power modules, motors, feedback arrangements, and the numerical control before replacement.
- Isolate the drive system: Disconnect the relevant electrical supplies and follow the machine’s lockout and stored-energy discharge procedures.
- Record the existing configuration: Document both axis assignments, drive parameters, module positions, and feedback connections before removal.
- Inspect the plug-in interface: Check the mounting and electrical interfaces for contamination, damage, or signs of overheating.
- Check motor feedback: Verify that the connected motors and feedback devices match the existing drive configuration.
- Install the control unit: Fit the module into the designated SIMODRIVE 611-D position according to the system installation procedure.
- Inspect associated connections: Check the control, feedback, and power-module interfaces for both axes before restoring electrical power.
- Restore drive parameters: Apply the appropriate settings for each motor, feedback arrangement, and mechanical axis.
- Verify axis assignments: Confirm that the numerical-control configuration and drive parameters associate each control channel with the correct machine axis.
- Test each axis separately: Carry out the approved commissioning checks for each motor before testing coordinated movement.
- Record maintenance results: Document the module reference, parameter changes, diagnostic findings, and commissioning results for future service work.
Related Components
| Component | Function |
|---|---|
| Siemens 6SN1118-0DH21-0AA0 | Two-axis SIMODRIVE 611-D performance control unit for digital feed drives |
| SIMODRIVE 611-D Power Modules | Supply electrical power to the connected feed motors |
| Digital Feed-Drive Motors | Produce controlled movement for the machine axes |
| Motor Feedback Devices | Provide the feedback signals used by the drive-control arrangement |
| Numerical Control System | Generates motion commands and coordinates machine operation |
| Mechanical Feed Transmissions | Convert motor rotation into linear or rotary movement |
| SIMODRIVE 611-D Drive System | Provides the modular architecture for compatible digital drives |
| Drive Power Supply | Supplies electrical energy to the drive system |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Siemens 6SN1118-0DH21-0AA0 | SIMODRIVE 611-D Closed-Loop Plug-In Control Unit, 2 Axes | Digital feed drives without a direct measuring system, performance control |
| Siemens 6SN1118-0DH22-0AA0 | SIMODRIVE 611-D Closed-Loop Plug-In Control Unit, 2 Axes | Related two-axis control configuration with a different measuring-system arrangement |
| Siemens 6SN1118-0DH23-0AA0 | SIMODRIVE 611-D Closed-Loop Plug-In Control Unit, 2 Axes | Related two-axis control configuration with direct measurement |
| Siemens 6SN1118-0DJ21-0AA0 | SIMODRIVE 611-D Closed-Loop Plug-In Performance Control Unit, 1 Axis | Single-axis performance-control alternative for compatible drive systems |
| Siemens SIMODRIVE 611-D | Digital Drive System | Compatible CNC feed-drive applications |
| Siemens Digital Feed-Drive Motors | Servo Motors | Controlled movement for compatible CNC machine axes |
Key Advantages
- Provides performance closed-loop control for two digital feed-drive axes.
- Supports compatible SIMODRIVE 611-D CNC installations.
- Uses the configured motor feedback arrangement without a direct measuring system.
- Integrates with the associated power modules and numerical control.
- Supports coordinated feed-axis operation within a modular digital drive architecture.
Technical FAQs
How many axes can the 6SN1118-0DH21-0AA0 control?
This model is specified for two digital feed-drive axes. Each axis requires the appropriate motor, feedback connections, power section, and parameter configuration within the SIMODRIVE 611-D system.
What does the performance-control designation indicate?
It identifies the control category of the unit within the SIMODRIVE 611-D family. It distinguishes this model from standard-control configurations and is relevant when matching a replacement to the original drive architecture.
How does operation without a direct measuring system affect the configuration?
The specified arrangement does not use a separate direct machine-axis measurement system. Drive regulation depends on the supported motor feedback arrangement and the mechanical relationship between the motor and the driven axis.
What should be checked if only one of the two axes operates correctly?
Check the affected axis’s assignment, motor feedback, associated power module, drive parameters, and mechanical transmission. Testing each axis separately helps distinguish a channel-specific problem from a shared control or power-system fault.